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espatlla &#40;manegot dels rotatoris&#41;&#44; colze &#40;complex extensor&#41; i maluc &#40;glutis&#41;&#46; En termes generals&#44; el dolor es localitza a la inserci&#243; del tend&#243; o a les estructures adjacents&#44; a la promin&#232;ncia &#242;ssia &#40;tendons rotular i del gluti&#41;&#44; tot i que tamb&#233; pot presentar-se a la porci&#243; medial &#40;tend&#243; d&#8217;Aquil&#183;les&#41;&#46;</p><p class="elsevierStylePara"> Se sap que les c&#224;rregues poden tenir conseq&#252;&#232;ncies positives i negatives per als tendons<span class="elsevierStyleSup">3</span>&#46; Una c&#224;rrega pot ser de tipus tensiu&#44; de cisalla o compressiva&#44; i afecta l&#8217;homeostasi del tend&#243;<span class="elsevierStyleSup">4</span>&#46; Sembla que els factors clau de l&#8217;aparici&#243; de la tendinopatia s&#243;n el mecanisme d&#8217;emmagatzematge i alliberament d&#8217;energia del tend&#243; de forma repetitiva&#44; juntament amb la compressi&#243;<span class="elsevierStyleSup">4</span>&#46; La quantitat de c&#224;rrega que es requereix per desenvolupar la patologia dep&#232;n de les caracter&#237;stiques dels individus&#44; de la capacitat per tolerar les c&#224;rregues &#40;al tend&#243;&#44; i a les estructures adjacents&#41;&#44; dels programes d&#8217;entrenament i de les c&#224;rregues de treball&#44; a m&#233;s de factors intr&#237;nsecs com l&#8217;edat&#44; g&#232;nere&#44; gen&#232;tica&#44; adipositat i altres condicions m&#232;diques<span class="elsevierStyleSup">5</span>&#46;</p><p class="elsevierStylePara"> Tot i l&#8217;augment d&#8217;estudis en aquest camp&#44; en els tractaments de la tendinopatia no es consideren els factors que s&#8217;han esmentat anteriorment&#44; i continuen basant-se en tractaments passius que no desenvolupen una millor capacitat del tend&#243; de tolerar c&#224;rregues&#46; Tamb&#233;&#44; molts tractaments se centren en la disminuci&#243; del dolor&#58; sacrifiquen la necessitat d&#8217;optimitzar el tend&#243;&#44; el m&#250;scul&#44; la cadena cin&#232;tica&#44; i s&#8217;obliden de restablir canvis neuronals&#46; Centrar-se en l&#8217;eliminaci&#243; del dolor sense considerar els factors que hi contribueixen o els signes patogn&#242;mics de la tendinopatia produeix una recurr&#232;ncia del dolor&#46; Aquest article remarca la import&#224;ncia de les c&#224;rregues del tend&#243;&#44; a m&#233;s d&#8217;analitzar l&#8217;evid&#232;ncia m&#233;s recent sobre la patologia del tend&#243;&#46; Es presenta un model de desenvolupament i proc&#233;s anatomopatol&#242;gic que hi ha darrera d&#8217;aquesta condici&#243;&#44; publicat anterior <br></br> ment en angl&#232;s el 2009&#44; per assistir els terapeutes en el tractament d&#8217;aquesta lesi&#243;&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Models patoetiol&#242;gics i conceptes de la patologia del tend&#243;</span></p><p class="elsevierStylePara"> S&#8217;han descrit diversos estats patol&#242;gics del tend&#243;&#46; Fa uns anys&#44; la tendinopatia es considerava un proc&#233;s degeneratiu amb canvis estructurals irreversibles del tend&#243;<span class="elsevierStyleSup">6</span>&#44; especialment els que presentaven desintegraci&#243; del col&#183;lagen de la matriu i canvis degeneratius cel&#183;lulars&#46; Altres propostes han suggerit que la tendinopatia s&#8217;esdev&#233; en una fase de regeneraci&#243; del tend&#243;&#44; amb pres&#232;ncia de c&#232;l&#183;lules actives i un augment de la producci&#243; de prote&#239;nes<span class="elsevierStyleSup">7</span>&#46; A aquest fenomen tamb&#233; se li ha associat una fallada de la regeneraci&#243;&#44; amb pres&#232;ncia de desorganitzaci&#243; de la matriu cel&#183;lular i de neovascularitzaci&#243;&#44; presents a les tendinopaties<span class="elsevierStyleSup">8&#44;9</span>&#46; Crear un model experimental que reprodueixi una relaci&#243; entre c&#224;rregues i patologia tendinosa pot ser complex&#44; a m&#233;s de la dificultat de construir un model de forma coherent i simple i que contempli tots els aspectes i fases de la tendinopatia&#46;</p><p class="elsevierStylePara"> S&#8217;han descrit diferents models d&#8217;etiopatog&#232;nia de la tendinopatia<span class="elsevierStyleSup">7&#44;10-13</span>&#44; que es poden dividir en tres categories&#44; basades en els processos histol&#242;gics seg&#252;ents&#58; a&#41; degradaci&#243;&#47;ruptura del col&#183;lagen&#59; b&#41; inflamaci&#243;&#44; o c&#41; resposta de la c&#232;l&#183;lula tendinosa&#46; Altres models han intentat integrar el sistema nervi&#243;s central i el dolor amb la patologia<span class="elsevierStyleSup">14&#44;15</span>&#59; tanmateix&#44; cap d&#8217;aquests models no ha considerat la possibilitat d&#8217;un proc&#233;s continuat&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Un nou model de patologia del tend&#243;</span></p><p class="elsevierStylePara"> El primer model de cont&#237;nuum fou publicat en angl&#232;s l&#8217;any 2009<span class="elsevierStyleSup">10</span> i actualitzat el 201616&#46; El model de cont&#237;nuum es descriu com un proc&#233;s continuat de la patologia del tend&#243;&#44; basat en les caracter&#237;stiques de tres estats tissulars&#58; tendinopatia reactiva&#44; tend&#243; desestructurat i tendinopatia degenerativa &#40;fig&#46; 1&#41;&#46; &#201;s &#250;til descriure el model en fases diferents&#44; malgrat que s&#8217;esdevingui com un proc&#233;s continu entre les tres fases&#46; A continuaci&#243; se n&#8217;indiquen les caracter&#237;stiques cl&#237;niques&#46;</p><p class="elsevierStylePara"><img alt="Figura 1 Model de cont&#237;nuum de la patologia del tend&#243;&#46; El model destaca la transici&#243; en les fases primerenques de la tendinopatia&#44; que &#233;s irreversible en la fase degenerativa&#46;" src="278v52n194-90461322fig1.jpg"></img></p><p class="elsevierStylePara"><span class="elsevierStyleBold">Figura 1 </span>Model de cont&#237;nuum de la patologia del tend&#243;&#46; El model destaca la transici&#243; en les fases primerenques de la tendinopatia&#44; que &#233;s irreversible en la fase degenerativa&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Fases del tend&#243;</span></p><p class="elsevierStylePara"><span class="elsevierStyleBold">Tendinopatia reactiva</span></p><p class="elsevierStylePara"> La tendinopatia reactiva s&#8217;esdev&#233; per sobrec&#224;rrega aguda de forces tensionals o de compressi&#243;&#44; i per definici&#243; no t&#233; resposta inflamat&#242;ria de la c&#232;l&#183;lula&#46; Cl&#237;nicament&#44; la tendinopatia reactiva &#233;s el resultat d&#8217;un augment sobtat d&#8217;activitat f&#237;sica a qu&#232; el tend&#243; est&#224; poc habituat<span class="elsevierStyleSup">17</span>&#44; tot i que certament tamb&#233; podria oc&#243;rrer despr&#233;s d&#8217;una contusi&#243; directa<span class="elsevierStyleSup">18</span>&#46; Igualment&#44; la tendinopatia podria esdevenir-se en tendons que han estat exposats a grans c&#224;rregues&#44; despr&#233;s d&#8217;un per&#237;ode de desc&#224;rrega<span class="elsevierStyleSup">17</span>&#44; com en el cas d&#8217;un esportista desentrenat despr&#233;s d&#8217;un per&#237;ode de lesi&#243;&#44; o d&#8217;un individu sedentari que incrementa l&#8217;activitat f&#237;sica sobtadament&#46;</p><p class="elsevierStylePara"> A nivell microsc&#242;pic&#44; la tendinopatia reactiva es descriu com una resposta hiperactiva cel&#183;lular a la c&#224;rrega&#46; El nombre de c&#232;l&#183;lules tendinoses augmenta considerablement&#44; les c&#232;l&#183;lules s&#8217;arrodoneixen i l&#8217;&#237;ndex metab&#242;lic creix significativament en els proteoglicans grans &#40;com l&#8217;agrec&#224;&#41;&#46; L&#8217;agrec&#224; &#233;s altament hidr&#242;fil&#44; per la qual cosa atrau aigua a l&#8217;interior de la matriu cel&#183;lular i s&#8217;observa un augment d&#8217;aigua<span class="elsevierStyleSup">19</span>&#46;</p><p class="elsevierStylePara"> &#201;s important remarcar que no s&#8217;observen canvis de la matriu cel&#183;lular en aquesta fase&#46; Cook et al&#46;<span class="elsevierStyleSup">20</span> demostraren que la morfologia alterada de la c&#232;l&#183;lula era l&#8217;&#250;nic canvi histopatol&#242;gic observat de manera a&#239;llada&#44; i suggeriren que els canvis patol&#242;gics de la c&#232;l&#183;lula i la matriu no fibril&#183;lar procedien a la desorganitzaci&#243; del col&#183;lagen&#46; Se suposa que aquest canvi a curt termini s&#8217;esdev&#233; com una adaptaci&#243; r&#224;pida a la c&#224;rrega rebuda &#40;disminuint l&#8217;estr&#232;s del tend&#243; i augmentant el di&#224;metre transversal&#41;&#44; tot i que a llarg termini poden oc&#243;rrer canvis estructurals i de les propietats mec&#224;niques del tend&#243;&#46; En imatges diagn&#242;stiques s&#8217;aprecia com el tend&#243; es presenta inflat amb un augment de di&#224;metre&#44; malgrat que no existeixin signes de desorganitzaci&#243; de la matriu cel&#183;lular<span class="elsevierStyleSup">21</span>&#46; El tend&#243; t&#233; el potencial de tornar a l&#8217;estat normal si es redueix suficientment la sobrec&#224;rrega&#44; o si hi ha el temps suficient entre sessions d&#8217;entrenament&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Tend&#243; desestructurat</span></p><p class="elsevierStylePara"> La fase de tend&#243; desestructurat tradicionalment ha estat descrita com a recuperaci&#243; fallida&#44; amb pres&#232;ncia de m&#233;s desorganitzaci&#243; de la matriu cel&#183;lular que en el tend&#243; reactiu&#46; &#201;s la fase de desenvolupament i progressi&#243; de la desestructuraci&#243; fibril&#183;lar&#59; la fase del tend&#243; desestructurat &#233;s el pas intermedi entre el tend&#243; reactiu i el tend&#243; degenerat&#46;</p><p class="elsevierStylePara"> Es produeix un augment generalitzat del nombre de c&#232;llules&#44; i un augment significatiu de la producci&#243; de col&#183;lagen i proteoglicans&#46; Conseq&#252;entment&#44; es produeix l&#8217;inici de la separaci&#243; del col&#183;lagen i la desorganitzaci&#243; de la matriu cel&#183;lular&#46; En aquest moment no s&#8217;observen imatges visibles de canvis en la vascularitzaci&#243; interna o neovascularitzaci&#243; &#40;p&#46; ex&#46;&#44; en l&#8217;ecografia Doppler&#41;&#46; Els canvis de la imatge reflecteixen la desestructuraci&#243; de la matriu&#44; amb discontinu&#239;tat dels fascicles de col&#183;lagen i petites &#224;rees delimitades hipoecoiques vistes en ecografia&#46; En resson&#224;ncia magn&#232;tica s&#8217;observa engruiximent del tend&#243; amb un increment de senyals en el tend&#243;&#46;</p><p class="elsevierStylePara"> El tend&#243; desestructurat &#233;s asimptom&#224;tic&#44; no presenta dolor i nom&#233;s &#233;s recognoscible amb el diagn&#242;stic per la imatge&#44; per la qual cosa no se sol veure en la pr&#224;ctica cl&#237;nica&#46; Es pensava que la fase del tend&#243; desestructurat es distingia per la reversibilitat del tend&#243;&#59; tanmateix&#44; actualment se sap que es tracta d&#8217;una fase purament d&#8217;estat patol&#242;gic&#44; amb abs&#232;ncia de canvis en la vascularitzaci&#243; com a &#250;nica difer&#232;ncia d&#8217;un tend&#243; degenerat&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Tendinopatia degenerativa</span></p><p class="elsevierStylePara"> La tendinopatia degenerativa est&#224; a bastament descrita a la literatura&#44; com una evoluci&#243; de la desorganitzaci&#243; de la matriu de col&#183;lagen&#44; canvis a les c&#232;l&#183;lules i aparici&#243; de neovascularitzaci&#243;<span class="elsevierStyleSup">9</span>&#46; Apareixen &#224;rees de mort cel&#183;lular per apoptosi&#44; trauma o fallada dels tenocits<span class="elsevierStyleSup">22</span>&#46; La capacitat de reversibilitat dels canvis patol&#242;gics &#233;s molt remota<span class="elsevierStyleSup">23</span>&#46; A l&#8217;ecografia&#44; els tendons amb signes degeneratius apareixen com a imatges hipoecoiques i sovint contenen un gran nombre de grans vasos visibles en mode Doppler&#46; En resson&#224;ncia magn&#232;tica es poden apreciar canvis localitzats&#44; amb augment del senyal intratendin&#243;s&#46; Tendons amb porcions de teixit degenerat tamb&#233; poden presentar zones de teixit sa&#44; que es poden observar amb ecografia de caracteritzaci&#243; de teixit &#40;<span class="elsevierStyleItalic">Ultra-sound Tissue Characterization</span> &#91;UTC&#93;&#41;&#46; L&#8217;evid&#232;ncia actual amb l&#8217;&#250;s d&#8217;UTC suggereix que el tend&#243; patol&#242;gic pot adaptar-se a les zones de desorganitzaci&#243; augmentant-ne la grand&#224;ria i assegurant zones suficients de teixit sa per compensar l&#8217;&#224;rea de desorganitzaci&#243;<span class="elsevierStyleSup">24</span>&#46; Les zones de desorganitzaci&#243; tissular no mostren cap estructura fibril&#183;lar alineada i s&#243;n incapaces de suportar cap mena d&#8217;estr&#232;s tensor&#44; per la qual cosa es creu que s&#243;n mec&#224;nicament inservibles&#46; Aix&#237;&#44; el tend&#243; hipertrofiat o engrossit&#44; hipot&#232;ticament&#44; &#233;s de fet una resposta positiva adaptada de la zona de teixit degeneratiu per poder mantenir la capacitat de c&#224;rregues tensores&#46;</p><p class="elsevierStylePara"> Se suposa que el pacient amb tendinopatia merament degenerativa no presenta cl&#237;nica fins a ser sotm&#232;s a una sobrec&#224;rrega i requereix atenci&#243; m&#232;dica&#44; presentant un quadre de reactivitat en el tend&#243; degenerat &#40;amb sobrec&#224;rrega en la part funcional i sana del tend&#243; degenerat&#41;&#46; Si la degeneraci&#243; del tend&#243; &#233;s suficientment extensa i se sotmet a c&#224;rregues elevades hi podria haver ruptura del tend&#243;<span class="elsevierStyleSup">25</span>&#44; i es confirma que el 97&#37; de ruptures tendinoses sofreixen canvis degeneratius<span class="elsevierStyleSup">26</span>&#46; &#201;s important&#44; i cal remarcar la manca de relaci&#243; entre dolor i patologia&#44; ja que moltes ruptures tendinoses s&#243;n asimptom&#224;tiques&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Presentaci&#243; cl&#237;nica del tend&#243; dolor&#243;s</span></p><p class="elsevierStylePara"> Descrites les diferents fases del tend&#243;&#44; aquestes formen part d&#8217;un model cont&#237;nuum&#44; i el teixit pot presentar alhora exemples dels tres tipus de teixit&#46; Per entendre-ho&#44; es important recordar que la tendinopatia normalment nom&#233;s s&#8217;esdev&#233; en pres&#232;ncia de dolor&#44; i no en estat asimptom&#224;tic o latent&#46; En el model de cont&#237;nuum el dolor tendin&#243;s es classifica en dues categories&#58; a&#41; tendinopatia reactiva en la primera presentaci&#243; cl&#237;nica conseq&#252;&#232;ncia d&#8217;una c&#224;rrega aguda&#44; i b&#41; tend&#243; reactiu &#40;desestructuraci&#243; tardana&#41; en la fase de patologia degenerativa del tend&#243;&#46; Hipot&#232;ticament pensem que la patologia del tend&#243; reactiu est&#224; associada a una expressi&#243; nociceptiva&#44; i probablement degut a un augment d&#8217;activitat cel&#183;lular i de l&#8217;expressi&#243; de canals i&#242;nics&#46; En presentacions de tend&#243; reactiu dins el proc&#233;s degeneratiu &#233;s el teixit sa el que es torna reactiu&#44; i no la porci&#243; degenerada &#40;fig&#46; 2&#41;&#46; En tendons degenerats asimptom&#224;tics es produeixen unes anormalitats substancials a la matriu cellular com a la c&#232;l&#183;lula&#44; per&#242; &#8212;i &#233;s molt important&#8212; que no s&#8217;esdev&#233; una producci&#243; de subst&#224;ncies nociceptives o una activitat de senyal nociceptiu&#44; ni tampoc en els receptors nociceptius&#46;</p><p class="elsevierStylePara"><img alt="Figura 2 Representaci&#243; simplificada de l’estat reactiu en la fase degenerativa de la tendinopatia&#46;Nota&#58; la porci&#243; degenerativa del tend&#243; no canvia significativament&#46; Rudavsky i Cook64 presenten un exemple d’aquesta presentaci&#243; vista en UTC&#46;" src="278v52n194-90461322fig2.jpg"></img></p><p class="elsevierStylePara"><span class="elsevierStyleBold">Figura 2 </span>Representaci&#243; simplificada de l&#8217;estat reactiu en la fase degenerativa de la tendinopatia&#46;<span class="elsevierStyleItalic">Nota&#58;</span> la porci&#243; degenerativa del tend&#243; no canvia significativament&#46; Rudavsky i Cook64 presenten un exemple d&#8217;aquesta presentaci&#243; vista en UTC&#46;</p><p class="elsevierStylePara"> L&#8217;origen exacte dels conductors nociceptius en la tendinopatia encara &#233;s desconegut&#46; L&#8217;estreta relaci&#243; entre dolor tendin&#243;s i c&#224;rregues mec&#224;niques&#44; juntament amb la incapacitat mec&#224;nica dels tenocits desalineats i la manca d&#8217;innervaci&#243; sensitiva del teixit profund del tend&#243;&#44; podria significar que la c&#232;l&#183;lula tendinosa produ&#237;s subst&#224;ncies nociceptives&#44; com a causant potencial nociceptiu<span class="elsevierStyleSup">27</span>&#46; Aquestes subst&#224;ncies&#44; vistes en tendons reactius o reactius en fase degenerativa&#44; poden irritar els receptors de nervis perif&#232;rics propers o al peritend&#243;<span class="elsevierStyleSup">28</span>&#46; Tamb&#233; s&#8217;explica perqu&#232; la patologia pot desenvolupar-se en zones m&#233;s profundes del tend&#243; sense presentar dolor tendin&#243;s&#44; ja que aquestes zones s&#243;n m&#233;s remotes i no els arriba la innervaci&#243;&#46; La patologia reactiva difosa tamb&#233; pot irritar el peritend&#243; degut al seu augment de grand&#224;ria&#46;</p><p class="elsevierStylePara"> Les c&#224;rregues cont&#237;nues en un tend&#243; dolor&#243;s perpetuen l&#8217;est&#237;mul nociceptiu&#44; cosa que fa possible una hiperalg&#232;sia secund&#224;ria en tendinopaties&#44; com a resposta a un est&#237;mul nociceptiu continu i no a un estat dolor&#243;s patofisiol&#242;gic &#40;sensibilitzaci&#243; central&#41;<span class="elsevierStyleSup">27&#44;29</span>&#46; Nombroses presentacions cl&#237;niques coincideixen amb el concepte seg&#252;ent&#58; el dolor tendin&#243;s resta localitzat i poc relacionat amb la c&#224;rrega del teixit<span class="elsevierStyleSup">30</span>&#46; Amb poca evid&#232;ncia de dolor tendin&#243;s espontani &#40;dolor independent de l&#8217;est&#237;mul&#41;&#44; aquests casos solen ser una caracter&#237;stica d&#8217;estats de dolor patofisiol&#242;gics&#46;</p><p class="elsevierStylePara"> El paper del sistema nervi&#243;s central en la modulaci&#243; del dolor &#233;s reconegut i ben descrit per altres autors i no &#233;s el prop&#242;sit d&#8217;aquest article&#46; Alguns autors consideren la tendinopatia com un dolor centralitzat i q&#252;estionen la rellev&#224;ncia dels canvis de l&#8217;estructura del tend&#243;&#46; Tot i que s&#8217;han evidenciat canvis en la percepci&#243; sensorial contralateral en individus amb tendinopatia<span class="elsevierStyleSup">31</span>&#44; aix&#242; pot significar una conducci&#243; nociceptiva constant&#44; com si provingu&#233;s del teixit local&#46; Els exercicis isom&#232;trics homolaterals a la tendinopatia no han mostrat efecte en el dolor contralateral<span class="elsevierStyleSup">32</span>&#44; i se suggereix que els factors locals s&#243;n cr&#237;tics en la producci&#243; del dolor&#46; En resum&#44; es coneix bona evid&#232;ncia de les adaptacions &#40;motores i sensorials&#41; de les tendinopaties&#44; tot i que encara no podem obviar el paper que juguen els nociceptors locals&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Evid&#232;ncia que recolza aquest model</span></p><p class="elsevierStylePara"> Com que els estudis longitudinals que investiguen canvis histopatol&#242;gics en humans s&#243;n problem&#224;tics &#232;ticament&#44; l&#8217;evoluci&#243; i les diferents fases del model del cont&#237;nuum deriven d&#8217;integrar evid&#232;ncia d&#8217;estudis transversals o de prevalen&#231;a&#44; estudis de diagn&#242;stic per la imatge i estudis amb animals&#46; Curiosament&#44; els conceptes utilitzats en aquest model s&#243;n sorprenentment similars als publicats sobre patologia del cart&#237;leg articular per Pollard et al&#46;<span class="elsevierStyleSup">33</span>&#46; Aquests autors tamb&#233; proposaren el concepte de progressi&#243; del teixit cartilagin&#243;s cap a una osteoartritis avan&#231;ada&#46; Tamb&#233; s&#8217;esdev&#233; una altra similitud en les respostes inicials reversibles dels proteoglicans i la regulaci&#243; positiva cel&#183;lular&#44; i finalitza amb canvis heterogenis irreversibles del teixit&#44; incloent-hi la degeneraci&#243; cel&#183;lular i cartilaginosa&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Estudis histopatol&#242;gics</span></p><p class="elsevierStylePara"> Els estudis realitzats en tendons asimptom&#224;tics d&#8217;humans han demostrat que els canvis de la c&#232;l&#183;lula sempre s&#243;n presents quan els canvis de la matriu cel&#183;lular apareixen<span class="elsevierStyleSup">20</span>&#59; progressen de canvis lleus fins a la desorganitzaci&#243; del collagen de la matriu&#44; i posteriorment &#40;en teoria&#44; per&#242; sense demostrar&#41; a la vascularitzaci&#243;&#46; Aix&#242; recolza la progressi&#243; de la patologia de tend&#243; reactiu a tend&#243; desestructurat&#46; Estudis amb animals confirmen aquestes troballes i mostren una progressi&#243; de la patologia molt similar<span class="elsevierStyleSup">17</span>&#44; malgrat que no es consideren models correctes per comparar amb tendinopaties per sobrec&#224;rrega en humans&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Estudis per la imatge</span></p><p class="elsevierStylePara"> Per resson&#224;ncia magn&#232;tica amb augment del volum i canvi del senyal es poden observar reaccions agudes del tend&#243; d&#8217;Aquil&#183;les&#44; despr&#233;s d&#8217;una sessi&#243; d&#8217;exercicis<span class="elsevierStyleSup">34</span>&#46; Aquests canvis coincideixen amb el nostre model i suggereixen&#44; com a resposta als exercicis&#44; que s&#243;n els causants d&#8217;un augment de volum &#40;perim&#232;tric&#41; i d&#8217;aigua &#40;directament de les subst&#224;ncies s&#242;lides o de vasos&#41;&#46; Aquests canvis r&#224;pids han estat confirmats per estudis que investiguen la resposta molecular a la c&#224;rrega<span class="elsevierStyleSup">19</span>&#59; tanmateix&#44; no &#233;s del tot conegut el motiu de la transici&#243; de canvis adaptatius a patol&#242;gics&#46;</p><p class="elsevierStylePara"> L&#8217;&#250;s de la caracteritzaci&#243; del teixit per ultras&#242; &#40;UTC&#41; ha demostrat diferents estats del teixit en el mateix tend&#243;&#44; tal com s&#8217;ha esmentat anteriorment<span class="elsevierStyleSup">24</span>&#46; La UTC tamb&#233; ha mostrat petites respostes estructurals dos dies despr&#233;s de suportar c&#224;rregues elevades&#44; que tornen a la normalitat al quart dia en tendons asimptom&#224;tics<span class="elsevierStyleSup">35</span>&#46; A m&#233;s&#44; amb UTC s&#8217;ha observat una millora dels tendons d&#8217;Aquil&#183;les sans al llarg de la pretemporada en un equip d&#8217;elit de futbol australi&#224;&#44; cosa que reafirma la capacitat adaptativa suggerida pel model de cont&#237;nuum<span class="elsevierStyleSup">36</span>&#46; Aix&#242; no obstant&#44; en aquest mateix grup&#44; tres dels 18 participants presentaren dolor en el tend&#243; d&#8217;Aquil&#183;les&#44; fet que remarca la variabilitat de l&#8217;efecte de les c&#224;rregues&#44; que depenen d&#8217;altres factors de risc intr&#237;nsecs &#40;com gen&#232;tica i adipositat&#41;&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Estudis cl&#237;nics</span></p><p class="elsevierStylePara"> L&#8217;efecte de l&#8217;acumulaci&#243; de c&#224;rregues en els tendons ha estat clarament demostrat en els tendons sans dels esportistes&#46; Fa uns anys els esportistes d&#8217;elit &#40;amb una hist&#242;ria d&#8217;una c&#224;rrega forta als tendons&#41; tenien una incid&#232;ncia major de tendinopatia i ruptura que els grups control per edat<span class="elsevierStyleSup">37</span>&#44; i aix&#237; s&#8217;afirmava la naturalesa irreversible de la patologia degenerativa&#44; donat que els exesportistes no recuperaven de manera espont&#224;nia la salut del tend&#243;&#46; El nostre model tamb&#233; est&#224; corroborat per recerques sobre l&#8217;impacte dels tractaments a l&#8217;estructura del tend&#243;&#44; i diversos estudis han evidenciat que no &#233;s requerida la normalitzaci&#243; de l&#8217;estructura del tend&#243; per millorar el dolor i la funci&#243;<span class="elsevierStyleSup">38-40</span>&#46; Aix&#237; es confirma la nostra hip&#242;tesi de que l&#8217;adaptaci&#243; s&#8217;esdev&#233; en la porci&#243; alineada i compensadora&#44; i no en la porci&#243; degenerada que roman mec&#224;nicament en silenci&#46; A m&#233;s&#44; tamb&#233; ho confirmen estudis que han demostrat l&#8217;engruiximent del tend&#243; d&#8217;Aquil&#183;les&#44; fins i tot al cap d&#8217;uns anys de la resoluci&#243; del dolor<span class="elsevierStyleSup">41</span>&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Tractament de la tendinopatia</span></p><p class="elsevierStylePara"> L&#8217;ess&#232;ncia del model de cont&#237;nuum es basa en la gesti&#243;&#44; l&#8217;optimitzaci&#243; i l&#8217;adaptaci&#243; de les intervencions de cada fase de la patologia tendinosa&#46; Mentre que l&#8217;exercici i el control de la c&#224;rrega s&#243;n considerats fonamentals per al tractament&#44; hi ha un exc&#233;s d&#8217;intervencions intratendinoses i peritendinoses dissenyades per tractar la patologia&#44; cosa que fa m&#233;s complex el proc&#233;s i la presa de decisions&#46; &#201;s important entendre que mentre el model de cont&#237;nuum presenta tres fases de la patologia&#44; aquestes fases s&#243;n cont&#237;nues i&#44; per tant&#44; la classificaci&#243; no &#233;s separativa&#46; D&#8217;altra banda&#44; la classificaci&#243; de pacients d&#8217;acord amb l&#8217;estructura&#44; dolor&#44; disfunci&#243; i capacitat de tolerar c&#224;rregues pot permetre als professionals orientar apropiadament els tractaments dels factors limitants cr&#237;tics&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Tractaments anti&#224;lgics de la tendinopatia</span></p><p class="elsevierStylePara"> Els pacients amb tendinopatia requereixen consulta m&#232;dica principalment per dolor&#46; Hi ha tractaments orientats a disminuir el dolor tendin&#243;s&#44; com els antiinflamatoris&#44; les infiltracions de corticoesteroides<span class="elsevierStyleSup">42</span>&#44; les ones de xoc<span class="elsevierStyleSup">43</span>&#44; les injeccions extratendinoses de volums alts<span class="elsevierStyleSup">44</span> i els raspats quir&#250;rgics<span class="elsevierStyleSup">45</span>&#46; Tot i que la majoria d&#8217;aquests tractaments mostren evid&#232;ncia en reduir el dolor a curt i mitj&#224; termini&#44; alguns autors n&#8217;han q&#252;estionat l&#8217;efectivitat a llarg termini<span class="elsevierStyleSup">15</span>&#44; i s&#8217;ha percebut un efecte m&#237;nim en la capacitat de tolerar c&#224;rregues<span class="elsevierStyleSup">31</span>&#46;</p><p class="elsevierStylePara"> La resposta del tend&#243; inflamat davant el paper dels anti-inflamatoris &#233;s complexa i molt debatuda<span class="elsevierStyleSup">46</span>&#46; Alguns estudis citen nivells normals de mediadors inflamatoris en estats de silenci de la tendinopatia<span class="elsevierStyleSup">47</span>&#59; en canvi&#44; altres proposen models inflamatoris que originen la progressi&#243; de la patologia<span class="elsevierStyleSup">48-50</span>&#46;</p><p class="elsevierStylePara"> Actualment&#44; l&#8217;evid&#232;ncia suggereix una pres&#232;ncia major de c&#232;l&#183;lules inflamat&#242;ries en els tendons dolorosos<span class="elsevierStyleSup">50</span>&#46; Els antiinflamatoris han demostrat que retarden el proc&#233;s de la regeneraci&#243; del teixit tou&#44; i tot i que tenen un efecte que redueix el dolor&#44; presenten un efecte negatiu en el proc&#233;s de normalitzaci&#243; del tend&#243;<span class="elsevierStyleSup">51</span>&#46; Els antiinflamatoris se solen prescriure en tendinopaties reactives&#44; donat que podrien inhibir l&#8217;expressi&#243; de subst&#224;ncies clau responsables d&#8217;aquesta fase<span class="elsevierStyleSup">20</span>&#46; S&#8217;ha demostrat que f&#224;rmacs com l&#8217;ibuprof&#232; tenen un efecte espec&#237;fic en la resposta reguladora cel&#183;lular negativa<span class="elsevierStyleSup">52</span>&#44; i s&#8217;ha vist que no tenen un efecte perjudicial en la reparaci&#243; definitiva del tend&#243;<span class="elsevierStyleSup">51</span>&#46;</p><p class="elsevierStylePara"> La remissi&#243; del dolor &#233;s essencial en el tractament&#46; No obstant aix&#242;&#44; els tractaments dirigits &#250;nicament a la reducci&#243; del dolor tenen un efecte m&#237;nim sobre els factors associats a la lesi&#243;&#44; com les alteracions de la cadena cin&#232;tica&#44; els factors que predisposen a la tendinopatia&#44; o la capacitat del teixit de suportar c&#224;rregues&#44; i en conseq&#252;&#232;ncia augmenta el risc de recurr&#232;ncia de la lesi&#243;&#46; &#201;s important remarcar l&#8217;efecte analg&#232;sic immediat vist amb els exercicis isom&#232;trics&#44; aix&#237; com una reducci&#243; de la inhibici&#243; cortical del m&#250;scul&#44; que a la vegada millora la for&#231;a del qu&#224;driceps de les tendinopaties rotulars<span class="elsevierStyleSup">32</span>&#46; A m&#233;s&#44; els tractaments amb programes de c&#224;rrega beneficien el tend&#243;<span class="elsevierStyleSup">53</span>&#44; el m&#250;scul<span class="elsevierStyleSup">54</span> i el control cortical del m&#250;scul&#44; cosa que facilita una millora de la funcionalitat i un resultat cl&#237;nic &#242;ptim&#46; Un programa de rehabilitaci&#243; basat en l&#8217;augment de c&#224;rregues &#233;s adequat per modificar l&#8217;equilibri d&#8217;excitabilitat i inhibici&#243; del control muscular<span class="elsevierStyleSup">55</span>&#44; canviant d&#8217;aquesta manera les c&#224;rregues que transmet el tend&#243;&#46;</p><p class="elsevierStylePara"> Altres intervencions dirigides a la disminuci&#243; del dolor inclouen l&#8217;optimitzaci&#243; &#40;reducci&#243;&#41; de les c&#224;rregues&#44; permetent que el tend&#243; s&#8217;adapti i que les c&#232;l&#183;lules siguin menys reactives&#46; La individualitzaci&#243; i la reducci&#243; de c&#224;rregues excessives s&#243;n tant senzilles com permetre un dia extra de descans entre sessions de c&#224;rregues tendinoses elevades&#44; o aconsellar la gesti&#243; de les c&#224;rregues intenses dins el treball regular&#46; Tamb&#233; &#233;s important treballar amb c&#224;rregues tendinoses sense emmagatzemament ni alliberament d&#8217;energia &#40;com la bicicleta&#44; o la for&#231;a basada en el treball amb peses&#41;&#44; que es poden mantenir&#44; doncs no solen induir resposta tendinosa&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Tractaments adre&#231;ats a l&#8217;estructura tendinosa</span></p><p class="elsevierStylePara"> Abans&#44; canviar l&#8217;estructura tendinosa era considerat l&#8217;ess&#232;ncia del tractament de les tendinopaties&#46; Tanmateix&#44; cada vegada hi ha m&#233;s evid&#232;ncia de la poca relaci&#243; entre dolor i estructura&#44; ja que els resultats m&#233;s positius s&#8217;aconsegueixen sense modificar l&#8217;estructura del tend&#243;<span class="elsevierStyleSup">38</span>&#46; Els tractaments anti&#224;lgics pr&#232;viament esmentats poden ser efectius en reduir la resposta cel&#183;lular del tend&#243; &#40;disminuci&#243; de la c&#224;rrega&#44; farmacoter&#224;pies&#41; be qu&#232; encara s&#8217;han de verificar&#46; Altres tractaments adre&#231;ats al canvi de l&#8217;estructura&#44; com c&#224;rregues exc&#232;ntriques elevades o injeccions intratendinoses&#44; poden ser altament agreujants en una fase de tend&#243; reactiu&#46; La c&#224;rrega tamb&#233; pot ser utilitzada per reduir el dolor &#40;isom&#232;trics&#41; i tamb&#233; inhibici&#243; motora<span class="elsevierStyleSup">32</span>&#44; tot i que calen m&#233;s estudis&#46; Aix&#242; &#233;s important&#44; ja que fins ara els exercicis amb dolor han tingut poca acceptaci&#243;&#44; i l&#8217;evid&#232;ncia de ritmes propis d&#8217;enfortiment no restableix l&#8217;excitabilitat corticoespinal ni la inhibici&#243; &#40;p&#46; ex&#46;&#44; vegeu Leung et al&#46;<span class="elsevierStyleSup">56</span>&#41;&#46;</p><p class="elsevierStylePara"> En tendinopatia degenerativa&#44; les intervencions que influeixen en l&#8217;estructura del tend&#243; s&#243;n menys cr&#237;tiques&#44; donat que la patologia sembla que t&#233; una reversibilitat limitada &#40;no calen canvis en aquesta regi&#243; per a un bon resultat&#41;&#46; A m&#233;s&#44; el tend&#243; patol&#242;gic sembla que compensa les &#224;rees de desorganitzaci&#243; augmentant les dimensions per mantenir el volum suficient de les estructures amb fibres alineades<span class="elsevierStyleSup">24</span>&#46; Com que la majoria de tendons degeneratius tenen teixit suficient per poder suportar c&#224;rregues&#44; i donada la capacitat limitada de millorar el model de cont&#237;nuum&#44; els tractaments han d&#8217;emprar estrat&#232;gies m&#233;s enll&#224; del cont&#237;nuum&#46; Calen m&#233;s estudis per intentar entendre els tendons que no s&#8217;adapten &#40;i el perqu&#232;&#41;&#46; Aquests tendons podrien ser els que acaben en ruptures tendinoses i s&#243;n els m&#233;s dif&#237;cils d&#8217;estudiar&#44; ja que no presenten cl&#237;nica fins a la ruptura&#46;</p><p class="elsevierStylePara"> Precisament&#44; els tractaments haurien de proposar-se potenciar m&#233;s la capacitat de tolerar c&#224;rregues en les porcions de fibres tendinoses alineades &#40;resist&#232;ncia de c&#224;rrega&#47;zona amb resposta mec&#224;nica&#41; que en estimular o restablir la porci&#243; degenerada&#46; Els exercicis han demostrat que influeixen en ambd&#243;s aspectes&#44; estructura i dolor&#46; Els exercicis exc&#232;ntrics s&#243;n els m&#233;s estudiats i han demostrat que beneficien el dolor&#44; la funcionalitat i el retorn a l&#8217;activitat<span class="elsevierStyleSup">57</span>&#46;</p><p class="elsevierStylePara"> Tot i que el model de cont&#237;nuum classifica la tendinopatia basant-se en la pres&#232;ncia i la quantitat de desorganitzaci&#243; estructural&#44; focalitzar els tractaments per regenerar les &#224;rees desorganitzades podria ser poc &#250;til&#44; ja que el tend&#243; ja pot estar compensat&#46; La millor manera d&#8217;explicar el canvi de concepte pot ser utilitzant la met&#224;fora del d&#242;nut &#40;que seria la zona de fibres alineades&#41; i no el forat &#40;que seria la zona de fibres desorganitzades&#41;&#46; Tanmateix&#44; les zones de fibres alineades soles no protegeixen d&#8217;episodis futurs de tendinopatia reactiva&#59; per tal d&#8217;evitar-ho&#44; els tractaments han d&#8217;evolucionar augmentant la capacitat de tolerar c&#224;rregues a la zona d&#242;nut a trav&#233;s de programes rehabilitadors de c&#224;rregues progressives&#46; &#201;s important considerar les demandes funcionals de l&#8217;individu&#44; ja que sovint diversos aspectes de les c&#224;rregues no es consideren en la rehabilitaci&#243;&#46; Els exercicis exc&#232;ntrics poden ser un tractament efectiu degut a l&#8217;alta c&#224;rrega a qu&#232; sotmeten el tend&#243;&#44; amb l&#8217;objectiu de millorar la capacitat de tolerar c&#224;rregues&#46; Tanmateix&#44; sovint no es plantegen aspectes com la c&#224;rrega del cicle estirament-escur&#231;ament i treball pliom&#232;tric&#44; i aix&#242; podria explicar la insufici&#232;ncia dels tractaments amb el maneig de les c&#224;rregues&#46; A m&#233;s d&#8217;incloure la resta de la cadena cin&#232;tica&#44; caldria proposar un programa que incorpor&#233;s 4 fases de rehabilitaci&#243; &#40;isom&#232;trics per reduir el dolor&#44; isot&#242;nics per restablir la for&#231;a&#44; introduir gradualment exercicis d&#8217;emmagatzemament d&#8217;energia&#44; seguits segons funci&#243; espec&#237;fica de l&#8217;esport&#47;exercicis d&#8217;emmagatzemament i alliberament d&#8217;energia&#41;&#46; Calen m&#233;s estudis per valorar l&#8217;efectivitat d&#8217;aquests tipus de tractaments&#44; malgrat la dificultat en investigar aquesta mena d&#8217;intervencions individualitzades&#46;</p><p class="elsevierStylePara"> En aquest context &#233;s dif&#237;cil trobar la import&#224;ncia dels tractaments dirigits a reparar tendons i normalitzar-ne l&#8217;estructura mitjan&#231;ant factors de creixement<span class="elsevierStyleSup">58</span>&#44; que no sembla que siguin apropiats en el proc&#233;s patol&#242;gic en cap de les fases del cont&#237;nuum&#46; Hi ha una resposta cel&#183;lular tendinosa hiperactiva&#44; i a m&#233;s augmenta el nombre de c&#232;l&#183;lules tendinoses en totes les fases&#44; fins i tot en la fase degenerativa<span class="elsevierStyleSup">59</span>&#46; Sembla desencertat l&#8217;augment de c&#232;l&#183;lules afegides &#40;mare o ten&#242;cits&#41; en ambient hipercel&#183;lular&#44; aix&#237; com restablir una relaci&#243; matriu-c&#232;l&#183;lula viable d&#8217;una regi&#243; degenerada del tend&#243; que no pot transmetre tensi&#243;&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Tractaments dirigits a restablir la funcionalitat i la capacitat de c&#224;rrega</span></p><p class="elsevierStylePara"> Hi ha pocs articles que hagin estudiat la recuperaci&#243; de la funcionalitat de la tendinopatia&#44; perqu&#232; es creu que remetre el dolor i restablir l&#8217;estructura tenen m&#233;s import&#224;ncia&#46; Cl&#237;nicament&#44; s&#8217;observen molts esportistes amb dolor&#44; per&#242; ells nom&#233;s sol&#183;liciten intervenci&#243; m&#232;dica quan els afecta el rendiment&#46; &#201;s dif&#237;cil quantificar funcionalitat i capacitat de c&#224;rrega si les mesures merament de for&#231;a no reflecteixen tot el qu&#232; succeeix&#46; Hi pot haver alteracions graduals del reclutament muscular associat a tendinopatia que ocasionen canvis de la funci&#243;<span class="elsevierStyleSup">32</span>&#46; La tornada a la pr&#224;ctica esportiva &#233;s potencialment una mesura de funcionalitat&#44; tot i que molts estudis s&#8217;han fet fora de la temporada competitiva&#46; Malgrat que la remissi&#243; del dolor elimina una barrera per millorar la funcionalitat&#44; altres d&#232;ficits funcionals&#44; com ara debilitats musculars&#44; alteracions de la cadena cin&#232;tica i incapacitat de tolerar c&#224;rregues&#44; poden predisposar el tend&#243; a sofrir relesions&#46;</p><p class="elsevierStylePara"> Calen m&#233;s estudis per descriure millor els d&#232;ficits funcionals associats a la tendinopatia i desenvolupar eines &#250;tils per als terapeutes&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Discussi&#243;</span></p><p class="elsevierStylePara"> L&#8217;objectiu d&#8217;aquest model &#233;s millorar la comprensi&#243; de les fases de la patologia del tend&#243; i ajudar els terapeutes en el raonament d&#8217;objectius i opcions de tractament&#58; gestionar el dolor i tractar la disfunci&#243;&#46; Malgrat el mecanisme inicial&#44; la patologia del tend&#243; es caracteritza per una resposta cellular significativa a una lesi&#243;<span class="elsevierStyleSup">13&#44;60</span>&#46; &#201;s poc probable que un &#250;nic model pugui descriure tots els aspectes de la patoetiologia tendinosa&#44; la relaci&#243; amb el dolor i la funci&#243;&#44; ja que aquests processos i models s&#243;n complexos&#46; La capacitat de provar el model de cont&#237;nuum est&#224; limitada en part per la tecnologia de diagn&#242;stics per la imatge per detectar canvis estructurals i patol&#242;gics&#44; a m&#233;s de necessitar mesures m&#233;s precises i de major exactitud per quantificar aspectes del dolor i de la disfunci&#243; de les tendinopaties&#46;</p><p class="elsevierStylePara"> Aquest model podria ajudar a millorar les investigacions en tendinopatia&#46; La variabilitat de les respostes dels tractaments podria disminuir&#44; junt amb l&#8217;heterogene&#239;tat dels grups estudiats i de les diferents fases implicades en la patologia&#46; A m&#233;s&#44; molts tractaments s&#243;n invasius&#44; i sabem poca cosa sobre la seva influ&#232;ncia en l&#8217;estructura&#44; i de la resposta a c&#224;rregues o tractaments&#46; Dividint els grups segons el model de cont&#237;nuum&#44; podria donar un resultat m&#233;s clar en els assaigs cl&#237;nics&#44; aix&#237; com millorar les guies cl&#237;niques&#46; &#201;s important tamb&#233; considerar els factors individuals externs al tend&#243;&#44; com edat&#44; gen&#232;tica&#44; sexe&#44; biomec&#224;nica i composici&#243; corporal<span class="elsevierStyleSup">61-63</span>&#46; Se suposa que els factors esmentats alteren la progressi&#243; o la regressi&#243; durant el cont&#237;nuum&#44; i un coneixement m&#233;s aprofundit de l&#8217;impacte d&#8217;aquests factors podria beneficiar el tractament i permetre assistir millor els esportistes en risc&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Conclusions</span></p><p class="elsevierStylePara"> El model de cont&#237;nuum de tendinopatia est&#224; basat en presentacions cl&#237;niques i troballes sobre el tend&#243; a la literatura&#46; Desitgem que permeti millorar el coneixement d&#8217;aquesta condici&#243; tan complexa&#44; i tamb&#233; millorar l&#8217;efic&#224;cia dels tractaments&#46; La investigaci&#243; biom&#232;dica ens recorda que aquest article&#44; com molts altres dels nostres col&#183;legues&#44; nom&#233;s &#233;s una part d&#8217;un cam&#237; llarg i dif&#237;cil per comprendre millor aquesta condici&#243;&#44; i li calen valoracions cont&#237;nues cient&#237;fiques i cl&#237;niques&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Conflicte d&#8217;interessos</span></p><p class="elsevierStylePara"> Els autors declaren que no tenen cap conflicte d&#8217;interessos&#46;</p><hr></hr><p class="elsevierStylePara"> Rebut el 10 d&#8217;abril de 2017&#59;<br></br> acceptat el 2 de maig de 2017</p><p class="elsevierStylePara"> &#42; Autora per a la correspond&#232;ncia&#46;<br></br><span class="elsevierStyleItalic">Correu electr&#242;nic&#58;</span><a href="mailto&#58;silvia&#46;ortega&#64;pl&#46;fcbarcelona&#46;cat" class="elsevierStyleCrossRefs">silvia&#46;ortega&#64;pl&#46;fcbarcelona&#46;cat</a> &#40;S&#46; Ortega-Cebrian&#41;</p>"
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        "resumen" => "<p class="elsevierStylePara"> El model de cont&#237;nuum fou proposat per Cook i Purdam el 2009&#44; amb l&#8217;objectiu de millorar la comprensi&#243; del marc complex que envolta la patologia del tend&#243;&#46; El cont&#237;nuum es basa en les caracter&#237;stiques dels tres estats tissulars del tend&#243;&#58; tend&#243; reactiu&#44; tend&#243; desestructurat i tend&#243; degeneratiu&#44; i es diferencia d&#8217;altres propostes per la visi&#243; de canvi continu de l&#8217;estructura del teixit tendin&#243;s&#44; segons la capacitat de tolerar c&#224;rregues&#46; Cada fase t&#233; una presentaci&#243; cl&#237;nica caracter&#237;stica i un tractament espec&#237;fic&#46; Estudis histol&#242;gics&#44; per imatge i cl&#237;nics&#44; corroboren amb evid&#232;ncia l&#8217;abordatge d&#8217;aquesta patologia a trav&#233;s del concepte del model de cont&#237;nuum&#46;</p>"
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        "resumen" => "<p class="elsevierStylePara"> Cook and Purdam first proposed the Continuum model in 2009&#44; with the aim of improving the understanding of the complexity of tendon pathologies&#46; The Continuum is based on three states of tendon structure&#58; reactive tendon&#44; tendon disrepair and degenerative tendon&#46; In contrast to other proposals&#44; the Continuum model describes continuous changes in tendon structure&#46; Each state of tendon structure represents a particular clinical presentation and requires a particular type of management&#46; Evidence seen in histopathological studies&#44; imaging and clinical studies all support the Continuum model for the analysis of tendon pathologies&#46;</p>"
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El contínuum de la patologia de tendó: concepte actual i implicacions clíniques
The continuum of tendon pathology: Current view and clinical implications
Jill L. Cooka, Eboni Rioa, Craig R. Purdamb, Michael Girdwooda, Silvia Ortega-Cebrianc, Sean I. Dockinga
a La Trobe Sport and Exercise Medicine Research Centre, La Trobe University, Austràlia. Australian Centre for Research into Injury in Sport and it’s Prevention, Federation University, Austràlia.
b Australian Centre for Research into Injury in Sport and it’s Prevention, Federation University, Austràlia. Physical Therapies, Australian Institute of Sport, Austràlia.
c FCB Universitas Salut, Barcelona, Espanya.
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    "textoCompleto" => "<p class="elsevierStylePara"><span class="elsevierStyleBold">Introducci&#243;</span></p><p class="elsevierStylePara"> La tendinopatia &#233;s una lesi&#243; per sobrec&#224;rrega comuna que es presenta a l&#8217;extremitat inferior i superior i causa dolor i p&#232;rdua de funcionalitat<span class="elsevierStyleSup">1</span>&#46; Com a part de la patologia de la tendinopatia s&#8217;han observat canvis en l&#8217;estructura del tend&#243; que afecten negativament la capacitat de c&#224;rrega i toler&#224;ncia del tend&#243;&#46;</p><p class="elsevierStylePara"> Les tendinopaties es produeixen en diferents parts del cos&#46; Les m&#233;s freq&#252;ents s&#243;n les dels tendons d&#8217;Aquil&#183;les i rotular<span class="elsevierStyleSup">2</span>&#44; i es caracteritzen per presentar un dolor molt localitzat&#44; associat a c&#224;rregues elevades sofertes pel tend&#243;&#46; Altres regions comunes on es produeix la tendinopatia s&#243;n&#58; pubis &#40;adductors&#41;&#44; espatlla &#40;manegot dels rotatoris&#41;&#44; colze &#40;complex extensor&#41; i maluc &#40;glutis&#41;&#46; En termes generals&#44; el dolor es localitza a la inserci&#243; del tend&#243; o a les estructures adjacents&#44; a la promin&#232;ncia &#242;ssia &#40;tendons rotular i del gluti&#41;&#44; tot i que tamb&#233; pot presentar-se a la porci&#243; medial &#40;tend&#243; d&#8217;Aquil&#183;les&#41;&#46;</p><p class="elsevierStylePara"> Se sap que les c&#224;rregues poden tenir conseq&#252;&#232;ncies positives i negatives per als tendons<span class="elsevierStyleSup">3</span>&#46; Una c&#224;rrega pot ser de tipus tensiu&#44; de cisalla o compressiva&#44; i afecta l&#8217;homeostasi del tend&#243;<span class="elsevierStyleSup">4</span>&#46; Sembla que els factors clau de l&#8217;aparici&#243; de la tendinopatia s&#243;n el mecanisme d&#8217;emmagatzematge i alliberament d&#8217;energia del tend&#243; de forma repetitiva&#44; juntament amb la compressi&#243;<span class="elsevierStyleSup">4</span>&#46; La quantitat de c&#224;rrega que es requereix per desenvolupar la patologia dep&#232;n de les caracter&#237;stiques dels individus&#44; de la capacitat per tolerar les c&#224;rregues &#40;al tend&#243;&#44; i a les estructures adjacents&#41;&#44; dels programes d&#8217;entrenament i de les c&#224;rregues de treball&#44; a m&#233;s de factors intr&#237;nsecs com l&#8217;edat&#44; g&#232;nere&#44; gen&#232;tica&#44; adipositat i altres condicions m&#232;diques<span class="elsevierStyleSup">5</span>&#46;</p><p class="elsevierStylePara"> Tot i l&#8217;augment d&#8217;estudis en aquest camp&#44; en els tractaments de la tendinopatia no es consideren els factors que s&#8217;han esmentat anteriorment&#44; i continuen basant-se en tractaments passius que no desenvolupen una millor capacitat del tend&#243; de tolerar c&#224;rregues&#46; Tamb&#233;&#44; molts tractaments se centren en la disminuci&#243; del dolor&#58; sacrifiquen la necessitat d&#8217;optimitzar el tend&#243;&#44; el m&#250;scul&#44; la cadena cin&#232;tica&#44; i s&#8217;obliden de restablir canvis neuronals&#46; Centrar-se en l&#8217;eliminaci&#243; del dolor sense considerar els factors que hi contribueixen o els signes patogn&#242;mics de la tendinopatia produeix una recurr&#232;ncia del dolor&#46; Aquest article remarca la import&#224;ncia de les c&#224;rregues del tend&#243;&#44; a m&#233;s d&#8217;analitzar l&#8217;evid&#232;ncia m&#233;s recent sobre la patologia del tend&#243;&#46; Es presenta un model de desenvolupament i proc&#233;s anatomopatol&#242;gic que hi ha darrera d&#8217;aquesta condici&#243;&#44; publicat anterior <br></br> ment en angl&#232;s el 2009&#44; per assistir els terapeutes en el tractament d&#8217;aquesta lesi&#243;&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Models patoetiol&#242;gics i conceptes de la patologia del tend&#243;</span></p><p class="elsevierStylePara"> S&#8217;han descrit diversos estats patol&#242;gics del tend&#243;&#46; Fa uns anys&#44; la tendinopatia es considerava un proc&#233;s degeneratiu amb canvis estructurals irreversibles del tend&#243;<span class="elsevierStyleSup">6</span>&#44; especialment els que presentaven desintegraci&#243; del col&#183;lagen de la matriu i canvis degeneratius cel&#183;lulars&#46; Altres propostes han suggerit que la tendinopatia s&#8217;esdev&#233; en una fase de regeneraci&#243; del tend&#243;&#44; amb pres&#232;ncia de c&#232;l&#183;lules actives i un augment de la producci&#243; de prote&#239;nes<span class="elsevierStyleSup">7</span>&#46; A aquest fenomen tamb&#233; se li ha associat una fallada de la regeneraci&#243;&#44; amb pres&#232;ncia de desorganitzaci&#243; de la matriu cel&#183;lular i de neovascularitzaci&#243;&#44; presents a les tendinopaties<span class="elsevierStyleSup">8&#44;9</span>&#46; Crear un model experimental que reprodueixi una relaci&#243; entre c&#224;rregues i patologia tendinosa pot ser complex&#44; a m&#233;s de la dificultat de construir un model de forma coherent i simple i que contempli tots els aspectes i fases de la tendinopatia&#46;</p><p class="elsevierStylePara"> S&#8217;han descrit diferents models d&#8217;etiopatog&#232;nia de la tendinopatia<span class="elsevierStyleSup">7&#44;10-13</span>&#44; que es poden dividir en tres categories&#44; basades en els processos histol&#242;gics seg&#252;ents&#58; a&#41; degradaci&#243;&#47;ruptura del col&#183;lagen&#59; b&#41; inflamaci&#243;&#44; o c&#41; resposta de la c&#232;l&#183;lula tendinosa&#46; Altres models han intentat integrar el sistema nervi&#243;s central i el dolor amb la patologia<span class="elsevierStyleSup">14&#44;15</span>&#59; tanmateix&#44; cap d&#8217;aquests models no ha considerat la possibilitat d&#8217;un proc&#233;s continuat&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Un nou model de patologia del tend&#243;</span></p><p class="elsevierStylePara"> El primer model de cont&#237;nuum fou publicat en angl&#232;s l&#8217;any 2009<span class="elsevierStyleSup">10</span> i actualitzat el 201616&#46; El model de cont&#237;nuum es descriu com un proc&#233;s continuat de la patologia del tend&#243;&#44; basat en les caracter&#237;stiques de tres estats tissulars&#58; tendinopatia reactiva&#44; tend&#243; desestructurat i tendinopatia degenerativa &#40;fig&#46; 1&#41;&#46; &#201;s &#250;til descriure el model en fases diferents&#44; malgrat que s&#8217;esdevingui com un proc&#233;s continu entre les tres fases&#46; A continuaci&#243; se n&#8217;indiquen les caracter&#237;stiques cl&#237;niques&#46;</p><p class="elsevierStylePara"><img alt="Figura 1 Model de cont&#237;nuum de la patologia del tend&#243;&#46; El model destaca la transici&#243; en les fases primerenques de la tendinopatia&#44; que &#233;s irreversible en la fase degenerativa&#46;" src="278v52n194-90461322fig1.jpg"></img></p><p class="elsevierStylePara"><span class="elsevierStyleBold">Figura 1 </span>Model de cont&#237;nuum de la patologia del tend&#243;&#46; El model destaca la transici&#243; en les fases primerenques de la tendinopatia&#44; que &#233;s irreversible en la fase degenerativa&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Fases del tend&#243;</span></p><p class="elsevierStylePara"><span class="elsevierStyleBold">Tendinopatia reactiva</span></p><p class="elsevierStylePara"> La tendinopatia reactiva s&#8217;esdev&#233; per sobrec&#224;rrega aguda de forces tensionals o de compressi&#243;&#44; i per definici&#243; no t&#233; resposta inflamat&#242;ria de la c&#232;l&#183;lula&#46; Cl&#237;nicament&#44; la tendinopatia reactiva &#233;s el resultat d&#8217;un augment sobtat d&#8217;activitat f&#237;sica a qu&#232; el tend&#243; est&#224; poc habituat<span class="elsevierStyleSup">17</span>&#44; tot i que certament tamb&#233; podria oc&#243;rrer despr&#233;s d&#8217;una contusi&#243; directa<span class="elsevierStyleSup">18</span>&#46; Igualment&#44; la tendinopatia podria esdevenir-se en tendons que han estat exposats a grans c&#224;rregues&#44; despr&#233;s d&#8217;un per&#237;ode de desc&#224;rrega<span class="elsevierStyleSup">17</span>&#44; com en el cas d&#8217;un esportista desentrenat despr&#233;s d&#8217;un per&#237;ode de lesi&#243;&#44; o d&#8217;un individu sedentari que incrementa l&#8217;activitat f&#237;sica sobtadament&#46;</p><p class="elsevierStylePara"> A nivell microsc&#242;pic&#44; la tendinopatia reactiva es descriu com una resposta hiperactiva cel&#183;lular a la c&#224;rrega&#46; El nombre de c&#232;l&#183;lules tendinoses augmenta considerablement&#44; les c&#232;l&#183;lules s&#8217;arrodoneixen i l&#8217;&#237;ndex metab&#242;lic creix significativament en els proteoglicans grans &#40;com l&#8217;agrec&#224;&#41;&#46; L&#8217;agrec&#224; &#233;s altament hidr&#242;fil&#44; per la qual cosa atrau aigua a l&#8217;interior de la matriu cel&#183;lular i s&#8217;observa un augment d&#8217;aigua<span class="elsevierStyleSup">19</span>&#46;</p><p class="elsevierStylePara"> &#201;s important remarcar que no s&#8217;observen canvis de la matriu cel&#183;lular en aquesta fase&#46; Cook et al&#46;<span class="elsevierStyleSup">20</span> demostraren que la morfologia alterada de la c&#232;l&#183;lula era l&#8217;&#250;nic canvi histopatol&#242;gic observat de manera a&#239;llada&#44; i suggeriren que els canvis patol&#242;gics de la c&#232;l&#183;lula i la matriu no fibril&#183;lar procedien a la desorganitzaci&#243; del col&#183;lagen&#46; Se suposa que aquest canvi a curt termini s&#8217;esdev&#233; com una adaptaci&#243; r&#224;pida a la c&#224;rrega rebuda &#40;disminuint l&#8217;estr&#232;s del tend&#243; i augmentant el di&#224;metre transversal&#41;&#44; tot i que a llarg termini poden oc&#243;rrer canvis estructurals i de les propietats mec&#224;niques del tend&#243;&#46; En imatges diagn&#242;stiques s&#8217;aprecia com el tend&#243; es presenta inflat amb un augment de di&#224;metre&#44; malgrat que no existeixin signes de desorganitzaci&#243; de la matriu cel&#183;lular<span class="elsevierStyleSup">21</span>&#46; El tend&#243; t&#233; el potencial de tornar a l&#8217;estat normal si es redueix suficientment la sobrec&#224;rrega&#44; o si hi ha el temps suficient entre sessions d&#8217;entrenament&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Tend&#243; desestructurat</span></p><p class="elsevierStylePara"> La fase de tend&#243; desestructurat tradicionalment ha estat descrita com a recuperaci&#243; fallida&#44; amb pres&#232;ncia de m&#233;s desorganitzaci&#243; de la matriu cel&#183;lular que en el tend&#243; reactiu&#46; &#201;s la fase de desenvolupament i progressi&#243; de la desestructuraci&#243; fibril&#183;lar&#59; la fase del tend&#243; desestructurat &#233;s el pas intermedi entre el tend&#243; reactiu i el tend&#243; degenerat&#46;</p><p class="elsevierStylePara"> Es produeix un augment generalitzat del nombre de c&#232;llules&#44; i un augment significatiu de la producci&#243; de col&#183;lagen i proteoglicans&#46; Conseq&#252;entment&#44; es produeix l&#8217;inici de la separaci&#243; del col&#183;lagen i la desorganitzaci&#243; de la matriu cel&#183;lular&#46; En aquest moment no s&#8217;observen imatges visibles de canvis en la vascularitzaci&#243; interna o neovascularitzaci&#243; &#40;p&#46; ex&#46;&#44; en l&#8217;ecografia Doppler&#41;&#46; Els canvis de la imatge reflecteixen la desestructuraci&#243; de la matriu&#44; amb discontinu&#239;tat dels fascicles de col&#183;lagen i petites &#224;rees delimitades hipoecoiques vistes en ecografia&#46; En resson&#224;ncia magn&#232;tica s&#8217;observa engruiximent del tend&#243; amb un increment de senyals en el tend&#243;&#46;</p><p class="elsevierStylePara"> El tend&#243; desestructurat &#233;s asimptom&#224;tic&#44; no presenta dolor i nom&#233;s &#233;s recognoscible amb el diagn&#242;stic per la imatge&#44; per la qual cosa no se sol veure en la pr&#224;ctica cl&#237;nica&#46; Es pensava que la fase del tend&#243; desestructurat es distingia per la reversibilitat del tend&#243;&#59; tanmateix&#44; actualment se sap que es tracta d&#8217;una fase purament d&#8217;estat patol&#242;gic&#44; amb abs&#232;ncia de canvis en la vascularitzaci&#243; com a &#250;nica difer&#232;ncia d&#8217;un tend&#243; degenerat&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Tendinopatia degenerativa</span></p><p class="elsevierStylePara"> La tendinopatia degenerativa est&#224; a bastament descrita a la literatura&#44; com una evoluci&#243; de la desorganitzaci&#243; de la matriu de col&#183;lagen&#44; canvis a les c&#232;l&#183;lules i aparici&#243; de neovascularitzaci&#243;<span class="elsevierStyleSup">9</span>&#46; Apareixen &#224;rees de mort cel&#183;lular per apoptosi&#44; trauma o fallada dels tenocits<span class="elsevierStyleSup">22</span>&#46; La capacitat de reversibilitat dels canvis patol&#242;gics &#233;s molt remota<span class="elsevierStyleSup">23</span>&#46; A l&#8217;ecografia&#44; els tendons amb signes degeneratius apareixen com a imatges hipoecoiques i sovint contenen un gran nombre de grans vasos visibles en mode Doppler&#46; En resson&#224;ncia magn&#232;tica es poden apreciar canvis localitzats&#44; amb augment del senyal intratendin&#243;s&#46; Tendons amb porcions de teixit degenerat tamb&#233; poden presentar zones de teixit sa&#44; que es poden observar amb ecografia de caracteritzaci&#243; de teixit &#40;<span class="elsevierStyleItalic">Ultra-sound Tissue Characterization</span> &#91;UTC&#93;&#41;&#46; L&#8217;evid&#232;ncia actual amb l&#8217;&#250;s d&#8217;UTC suggereix que el tend&#243; patol&#242;gic pot adaptar-se a les zones de desorganitzaci&#243; augmentant-ne la grand&#224;ria i assegurant zones suficients de teixit sa per compensar l&#8217;&#224;rea de desorganitzaci&#243;<span class="elsevierStyleSup">24</span>&#46; Les zones de desorganitzaci&#243; tissular no mostren cap estructura fibril&#183;lar alineada i s&#243;n incapaces de suportar cap mena d&#8217;estr&#232;s tensor&#44; per la qual cosa es creu que s&#243;n mec&#224;nicament inservibles&#46; Aix&#237;&#44; el tend&#243; hipertrofiat o engrossit&#44; hipot&#232;ticament&#44; &#233;s de fet una resposta positiva adaptada de la zona de teixit degeneratiu per poder mantenir la capacitat de c&#224;rregues tensores&#46;</p><p class="elsevierStylePara"> Se suposa que el pacient amb tendinopatia merament degenerativa no presenta cl&#237;nica fins a ser sotm&#232;s a una sobrec&#224;rrega i requereix atenci&#243; m&#232;dica&#44; presentant un quadre de reactivitat en el tend&#243; degenerat &#40;amb sobrec&#224;rrega en la part funcional i sana del tend&#243; degenerat&#41;&#46; Si la degeneraci&#243; del tend&#243; &#233;s suficientment extensa i se sotmet a c&#224;rregues elevades hi podria haver ruptura del tend&#243;<span class="elsevierStyleSup">25</span>&#44; i es confirma que el 97&#37; de ruptures tendinoses sofreixen canvis degeneratius<span class="elsevierStyleSup">26</span>&#46; &#201;s important&#44; i cal remarcar la manca de relaci&#243; entre dolor i patologia&#44; ja que moltes ruptures tendinoses s&#243;n asimptom&#224;tiques&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Presentaci&#243; cl&#237;nica del tend&#243; dolor&#243;s</span></p><p class="elsevierStylePara"> Descrites les diferents fases del tend&#243;&#44; aquestes formen part d&#8217;un model cont&#237;nuum&#44; i el teixit pot presentar alhora exemples dels tres tipus de teixit&#46; Per entendre-ho&#44; es important recordar que la tendinopatia normalment nom&#233;s s&#8217;esdev&#233; en pres&#232;ncia de dolor&#44; i no en estat asimptom&#224;tic o latent&#46; En el model de cont&#237;nuum el dolor tendin&#243;s es classifica en dues categories&#58; a&#41; tendinopatia reactiva en la primera presentaci&#243; cl&#237;nica conseq&#252;&#232;ncia d&#8217;una c&#224;rrega aguda&#44; i b&#41; tend&#243; reactiu &#40;desestructuraci&#243; tardana&#41; en la fase de patologia degenerativa del tend&#243;&#46; Hipot&#232;ticament pensem que la patologia del tend&#243; reactiu est&#224; associada a una expressi&#243; nociceptiva&#44; i probablement degut a un augment d&#8217;activitat cel&#183;lular i de l&#8217;expressi&#243; de canals i&#242;nics&#46; En presentacions de tend&#243; reactiu dins el proc&#233;s degeneratiu &#233;s el teixit sa el que es torna reactiu&#44; i no la porci&#243; degenerada &#40;fig&#46; 2&#41;&#46; En tendons degenerats asimptom&#224;tics es produeixen unes anormalitats substancials a la matriu cellular com a la c&#232;l&#183;lula&#44; per&#242; &#8212;i &#233;s molt important&#8212; que no s&#8217;esdev&#233; una producci&#243; de subst&#224;ncies nociceptives o una activitat de senyal nociceptiu&#44; ni tampoc en els receptors nociceptius&#46;</p><p class="elsevierStylePara"><img alt="Figura 2 Representaci&#243; simplificada de l’estat reactiu en la fase degenerativa de la tendinopatia&#46;Nota&#58; la porci&#243; degenerativa del tend&#243; no canvia significativament&#46; Rudavsky i Cook64 presenten un exemple d’aquesta presentaci&#243; vista en UTC&#46;" src="278v52n194-90461322fig2.jpg"></img></p><p class="elsevierStylePara"><span class="elsevierStyleBold">Figura 2 </span>Representaci&#243; simplificada de l&#8217;estat reactiu en la fase degenerativa de la tendinopatia&#46;<span class="elsevierStyleItalic">Nota&#58;</span> la porci&#243; degenerativa del tend&#243; no canvia significativament&#46; Rudavsky i Cook64 presenten un exemple d&#8217;aquesta presentaci&#243; vista en UTC&#46;</p><p class="elsevierStylePara"> L&#8217;origen exacte dels conductors nociceptius en la tendinopatia encara &#233;s desconegut&#46; L&#8217;estreta relaci&#243; entre dolor tendin&#243;s i c&#224;rregues mec&#224;niques&#44; juntament amb la incapacitat mec&#224;nica dels tenocits desalineats i la manca d&#8217;innervaci&#243; sensitiva del teixit profund del tend&#243;&#44; podria significar que la c&#232;l&#183;lula tendinosa produ&#237;s subst&#224;ncies nociceptives&#44; com a causant potencial nociceptiu<span class="elsevierStyleSup">27</span>&#46; Aquestes subst&#224;ncies&#44; vistes en tendons reactius o reactius en fase degenerativa&#44; poden irritar els receptors de nervis perif&#232;rics propers o al peritend&#243;<span class="elsevierStyleSup">28</span>&#46; Tamb&#233; s&#8217;explica perqu&#232; la patologia pot desenvolupar-se en zones m&#233;s profundes del tend&#243; sense presentar dolor tendin&#243;s&#44; ja que aquestes zones s&#243;n m&#233;s remotes i no els arriba la innervaci&#243;&#46; La patologia reactiva difosa tamb&#233; pot irritar el peritend&#243; degut al seu augment de grand&#224;ria&#46;</p><p class="elsevierStylePara"> Les c&#224;rregues cont&#237;nues en un tend&#243; dolor&#243;s perpetuen l&#8217;est&#237;mul nociceptiu&#44; cosa que fa possible una hiperalg&#232;sia secund&#224;ria en tendinopaties&#44; com a resposta a un est&#237;mul nociceptiu continu i no a un estat dolor&#243;s patofisiol&#242;gic &#40;sensibilitzaci&#243; central&#41;<span class="elsevierStyleSup">27&#44;29</span>&#46; Nombroses presentacions cl&#237;niques coincideixen amb el concepte seg&#252;ent&#58; el dolor tendin&#243;s resta localitzat i poc relacionat amb la c&#224;rrega del teixit<span class="elsevierStyleSup">30</span>&#46; Amb poca evid&#232;ncia de dolor tendin&#243;s espontani &#40;dolor independent de l&#8217;est&#237;mul&#41;&#44; aquests casos solen ser una caracter&#237;stica d&#8217;estats de dolor patofisiol&#242;gics&#46;</p><p class="elsevierStylePara"> El paper del sistema nervi&#243;s central en la modulaci&#243; del dolor &#233;s reconegut i ben descrit per altres autors i no &#233;s el prop&#242;sit d&#8217;aquest article&#46; Alguns autors consideren la tendinopatia com un dolor centralitzat i q&#252;estionen la rellev&#224;ncia dels canvis de l&#8217;estructura del tend&#243;&#46; Tot i que s&#8217;han evidenciat canvis en la percepci&#243; sensorial contralateral en individus amb tendinopatia<span class="elsevierStyleSup">31</span>&#44; aix&#242; pot significar una conducci&#243; nociceptiva constant&#44; com si provingu&#233;s del teixit local&#46; Els exercicis isom&#232;trics homolaterals a la tendinopatia no han mostrat efecte en el dolor contralateral<span class="elsevierStyleSup">32</span>&#44; i se suggereix que els factors locals s&#243;n cr&#237;tics en la producci&#243; del dolor&#46; En resum&#44; es coneix bona evid&#232;ncia de les adaptacions &#40;motores i sensorials&#41; de les tendinopaties&#44; tot i que encara no podem obviar el paper que juguen els nociceptors locals&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Evid&#232;ncia que recolza aquest model</span></p><p class="elsevierStylePara"> Com que els estudis longitudinals que investiguen canvis histopatol&#242;gics en humans s&#243;n problem&#224;tics &#232;ticament&#44; l&#8217;evoluci&#243; i les diferents fases del model del cont&#237;nuum deriven d&#8217;integrar evid&#232;ncia d&#8217;estudis transversals o de prevalen&#231;a&#44; estudis de diagn&#242;stic per la imatge i estudis amb animals&#46; Curiosament&#44; els conceptes utilitzats en aquest model s&#243;n sorprenentment similars als publicats sobre patologia del cart&#237;leg articular per Pollard et al&#46;<span class="elsevierStyleSup">33</span>&#46; Aquests autors tamb&#233; proposaren el concepte de progressi&#243; del teixit cartilagin&#243;s cap a una osteoartritis avan&#231;ada&#46; Tamb&#233; s&#8217;esdev&#233; una altra similitud en les respostes inicials reversibles dels proteoglicans i la regulaci&#243; positiva cel&#183;lular&#44; i finalitza amb canvis heterogenis irreversibles del teixit&#44; incloent-hi la degeneraci&#243; cel&#183;lular i cartilaginosa&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Estudis histopatol&#242;gics</span></p><p class="elsevierStylePara"> Els estudis realitzats en tendons asimptom&#224;tics d&#8217;humans han demostrat que els canvis de la c&#232;l&#183;lula sempre s&#243;n presents quan els canvis de la matriu cel&#183;lular apareixen<span class="elsevierStyleSup">20</span>&#59; progressen de canvis lleus fins a la desorganitzaci&#243; del collagen de la matriu&#44; i posteriorment &#40;en teoria&#44; per&#242; sense demostrar&#41; a la vascularitzaci&#243;&#46; Aix&#242; recolza la progressi&#243; de la patologia de tend&#243; reactiu a tend&#243; desestructurat&#46; Estudis amb animals confirmen aquestes troballes i mostren una progressi&#243; de la patologia molt similar<span class="elsevierStyleSup">17</span>&#44; malgrat que no es consideren models correctes per comparar amb tendinopaties per sobrec&#224;rrega en humans&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Estudis per la imatge</span></p><p class="elsevierStylePara"> Per resson&#224;ncia magn&#232;tica amb augment del volum i canvi del senyal es poden observar reaccions agudes del tend&#243; d&#8217;Aquil&#183;les&#44; despr&#233;s d&#8217;una sessi&#243; d&#8217;exercicis<span class="elsevierStyleSup">34</span>&#46; Aquests canvis coincideixen amb el nostre model i suggereixen&#44; com a resposta als exercicis&#44; que s&#243;n els causants d&#8217;un augment de volum &#40;perim&#232;tric&#41; i d&#8217;aigua &#40;directament de les subst&#224;ncies s&#242;lides o de vasos&#41;&#46; Aquests canvis r&#224;pids han estat confirmats per estudis que investiguen la resposta molecular a la c&#224;rrega<span class="elsevierStyleSup">19</span>&#59; tanmateix&#44; no &#233;s del tot conegut el motiu de la transici&#243; de canvis adaptatius a patol&#242;gics&#46;</p><p class="elsevierStylePara"> L&#8217;&#250;s de la caracteritzaci&#243; del teixit per ultras&#242; &#40;UTC&#41; ha demostrat diferents estats del teixit en el mateix tend&#243;&#44; tal com s&#8217;ha esmentat anteriorment<span class="elsevierStyleSup">24</span>&#46; La UTC tamb&#233; ha mostrat petites respostes estructurals dos dies despr&#233;s de suportar c&#224;rregues elevades&#44; que tornen a la normalitat al quart dia en tendons asimptom&#224;tics<span class="elsevierStyleSup">35</span>&#46; A m&#233;s&#44; amb UTC s&#8217;ha observat una millora dels tendons d&#8217;Aquil&#183;les sans al llarg de la pretemporada en un equip d&#8217;elit de futbol australi&#224;&#44; cosa que reafirma la capacitat adaptativa suggerida pel model de cont&#237;nuum<span class="elsevierStyleSup">36</span>&#46; Aix&#242; no obstant&#44; en aquest mateix grup&#44; tres dels 18 participants presentaren dolor en el tend&#243; d&#8217;Aquil&#183;les&#44; fet que remarca la variabilitat de l&#8217;efecte de les c&#224;rregues&#44; que depenen d&#8217;altres factors de risc intr&#237;nsecs &#40;com gen&#232;tica i adipositat&#41;&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Estudis cl&#237;nics</span></p><p class="elsevierStylePara"> L&#8217;efecte de l&#8217;acumulaci&#243; de c&#224;rregues en els tendons ha estat clarament demostrat en els tendons sans dels esportistes&#46; Fa uns anys els esportistes d&#8217;elit &#40;amb una hist&#242;ria d&#8217;una c&#224;rrega forta als tendons&#41; tenien una incid&#232;ncia major de tendinopatia i ruptura que els grups control per edat<span class="elsevierStyleSup">37</span>&#44; i aix&#237; s&#8217;afirmava la naturalesa irreversible de la patologia degenerativa&#44; donat que els exesportistes no recuperaven de manera espont&#224;nia la salut del tend&#243;&#46; El nostre model tamb&#233; est&#224; corroborat per recerques sobre l&#8217;impacte dels tractaments a l&#8217;estructura del tend&#243;&#44; i diversos estudis han evidenciat que no &#233;s requerida la normalitzaci&#243; de l&#8217;estructura del tend&#243; per millorar el dolor i la funci&#243;<span class="elsevierStyleSup">38-40</span>&#46; Aix&#237; es confirma la nostra hip&#242;tesi de que l&#8217;adaptaci&#243; s&#8217;esdev&#233; en la porci&#243; alineada i compensadora&#44; i no en la porci&#243; degenerada que roman mec&#224;nicament en silenci&#46; A m&#233;s&#44; tamb&#233; ho confirmen estudis que han demostrat l&#8217;engruiximent del tend&#243; d&#8217;Aquil&#183;les&#44; fins i tot al cap d&#8217;uns anys de la resoluci&#243; del dolor<span class="elsevierStyleSup">41</span>&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Tractament de la tendinopatia</span></p><p class="elsevierStylePara"> L&#8217;ess&#232;ncia del model de cont&#237;nuum es basa en la gesti&#243;&#44; l&#8217;optimitzaci&#243; i l&#8217;adaptaci&#243; de les intervencions de cada fase de la patologia tendinosa&#46; Mentre que l&#8217;exercici i el control de la c&#224;rrega s&#243;n considerats fonamentals per al tractament&#44; hi ha un exc&#233;s d&#8217;intervencions intratendinoses i peritendinoses dissenyades per tractar la patologia&#44; cosa que fa m&#233;s complex el proc&#233;s i la presa de decisions&#46; &#201;s important entendre que mentre el model de cont&#237;nuum presenta tres fases de la patologia&#44; aquestes fases s&#243;n cont&#237;nues i&#44; per tant&#44; la classificaci&#243; no &#233;s separativa&#46; D&#8217;altra banda&#44; la classificaci&#243; de pacients d&#8217;acord amb l&#8217;estructura&#44; dolor&#44; disfunci&#243; i capacitat de tolerar c&#224;rregues pot permetre als professionals orientar apropiadament els tractaments dels factors limitants cr&#237;tics&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Tractaments anti&#224;lgics de la tendinopatia</span></p><p class="elsevierStylePara"> Els pacients amb tendinopatia requereixen consulta m&#232;dica principalment per dolor&#46; Hi ha tractaments orientats a disminuir el dolor tendin&#243;s&#44; com els antiinflamatoris&#44; les infiltracions de corticoesteroides<span class="elsevierStyleSup">42</span>&#44; les ones de xoc<span class="elsevierStyleSup">43</span>&#44; les injeccions extratendinoses de volums alts<span class="elsevierStyleSup">44</span> i els raspats quir&#250;rgics<span class="elsevierStyleSup">45</span>&#46; Tot i que la majoria d&#8217;aquests tractaments mostren evid&#232;ncia en reduir el dolor a curt i mitj&#224; termini&#44; alguns autors n&#8217;han q&#252;estionat l&#8217;efectivitat a llarg termini<span class="elsevierStyleSup">15</span>&#44; i s&#8217;ha percebut un efecte m&#237;nim en la capacitat de tolerar c&#224;rregues<span class="elsevierStyleSup">31</span>&#46;</p><p class="elsevierStylePara"> La resposta del tend&#243; inflamat davant el paper dels anti-inflamatoris &#233;s complexa i molt debatuda<span class="elsevierStyleSup">46</span>&#46; Alguns estudis citen nivells normals de mediadors inflamatoris en estats de silenci de la tendinopatia<span class="elsevierStyleSup">47</span>&#59; en canvi&#44; altres proposen models inflamatoris que originen la progressi&#243; de la patologia<span class="elsevierStyleSup">48-50</span>&#46;</p><p class="elsevierStylePara"> Actualment&#44; l&#8217;evid&#232;ncia suggereix una pres&#232;ncia major de c&#232;l&#183;lules inflamat&#242;ries en els tendons dolorosos<span class="elsevierStyleSup">50</span>&#46; Els antiinflamatoris han demostrat que retarden el proc&#233;s de la regeneraci&#243; del teixit tou&#44; i tot i que tenen un efecte que redueix el dolor&#44; presenten un efecte negatiu en el proc&#233;s de normalitzaci&#243; del tend&#243;<span class="elsevierStyleSup">51</span>&#46; Els antiinflamatoris se solen prescriure en tendinopaties reactives&#44; donat que podrien inhibir l&#8217;expressi&#243; de subst&#224;ncies clau responsables d&#8217;aquesta fase<span class="elsevierStyleSup">20</span>&#46; S&#8217;ha demostrat que f&#224;rmacs com l&#8217;ibuprof&#232; tenen un efecte espec&#237;fic en la resposta reguladora cel&#183;lular negativa<span class="elsevierStyleSup">52</span>&#44; i s&#8217;ha vist que no tenen un efecte perjudicial en la reparaci&#243; definitiva del tend&#243;<span class="elsevierStyleSup">51</span>&#46;</p><p class="elsevierStylePara"> La remissi&#243; del dolor &#233;s essencial en el tractament&#46; No obstant aix&#242;&#44; els tractaments dirigits &#250;nicament a la reducci&#243; del dolor tenen un efecte m&#237;nim sobre els factors associats a la lesi&#243;&#44; com les alteracions de la cadena cin&#232;tica&#44; els factors que predisposen a la tendinopatia&#44; o la capacitat del teixit de suportar c&#224;rregues&#44; i en conseq&#252;&#232;ncia augmenta el risc de recurr&#232;ncia de la lesi&#243;&#46; &#201;s important remarcar l&#8217;efecte analg&#232;sic immediat vist amb els exercicis isom&#232;trics&#44; aix&#237; com una reducci&#243; de la inhibici&#243; cortical del m&#250;scul&#44; que a la vegada millora la for&#231;a del qu&#224;driceps de les tendinopaties rotulars<span class="elsevierStyleSup">32</span>&#46; A m&#233;s&#44; els tractaments amb programes de c&#224;rrega beneficien el tend&#243;<span class="elsevierStyleSup">53</span>&#44; el m&#250;scul<span class="elsevierStyleSup">54</span> i el control cortical del m&#250;scul&#44; cosa que facilita una millora de la funcionalitat i un resultat cl&#237;nic &#242;ptim&#46; Un programa de rehabilitaci&#243; basat en l&#8217;augment de c&#224;rregues &#233;s adequat per modificar l&#8217;equilibri d&#8217;excitabilitat i inhibici&#243; del control muscular<span class="elsevierStyleSup">55</span>&#44; canviant d&#8217;aquesta manera les c&#224;rregues que transmet el tend&#243;&#46;</p><p class="elsevierStylePara"> Altres intervencions dirigides a la disminuci&#243; del dolor inclouen l&#8217;optimitzaci&#243; &#40;reducci&#243;&#41; de les c&#224;rregues&#44; permetent que el tend&#243; s&#8217;adapti i que les c&#232;l&#183;lules siguin menys reactives&#46; La individualitzaci&#243; i la reducci&#243; de c&#224;rregues excessives s&#243;n tant senzilles com permetre un dia extra de descans entre sessions de c&#224;rregues tendinoses elevades&#44; o aconsellar la gesti&#243; de les c&#224;rregues intenses dins el treball regular&#46; Tamb&#233; &#233;s important treballar amb c&#224;rregues tendinoses sense emmagatzemament ni alliberament d&#8217;energia &#40;com la bicicleta&#44; o la for&#231;a basada en el treball amb peses&#41;&#44; que es poden mantenir&#44; doncs no solen induir resposta tendinosa&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Tractaments adre&#231;ats a l&#8217;estructura tendinosa</span></p><p class="elsevierStylePara"> Abans&#44; canviar l&#8217;estructura tendinosa era considerat l&#8217;ess&#232;ncia del tractament de les tendinopaties&#46; Tanmateix&#44; cada vegada hi ha m&#233;s evid&#232;ncia de la poca relaci&#243; entre dolor i estructura&#44; ja que els resultats m&#233;s positius s&#8217;aconsegueixen sense modificar l&#8217;estructura del tend&#243;<span class="elsevierStyleSup">38</span>&#46; Els tractaments anti&#224;lgics pr&#232;viament esmentats poden ser efectius en reduir la resposta cel&#183;lular del tend&#243; &#40;disminuci&#243; de la c&#224;rrega&#44; farmacoter&#224;pies&#41; be qu&#232; encara s&#8217;han de verificar&#46; Altres tractaments adre&#231;ats al canvi de l&#8217;estructura&#44; com c&#224;rregues exc&#232;ntriques elevades o injeccions intratendinoses&#44; poden ser altament agreujants en una fase de tend&#243; reactiu&#46; La c&#224;rrega tamb&#233; pot ser utilitzada per reduir el dolor &#40;isom&#232;trics&#41; i tamb&#233; inhibici&#243; motora<span class="elsevierStyleSup">32</span>&#44; tot i que calen m&#233;s estudis&#46; Aix&#242; &#233;s important&#44; ja que fins ara els exercicis amb dolor han tingut poca acceptaci&#243;&#44; i l&#8217;evid&#232;ncia de ritmes propis d&#8217;enfortiment no restableix l&#8217;excitabilitat corticoespinal ni la inhibici&#243; &#40;p&#46; ex&#46;&#44; vegeu Leung et al&#46;<span class="elsevierStyleSup">56</span>&#41;&#46;</p><p class="elsevierStylePara"> En tendinopatia degenerativa&#44; les intervencions que influeixen en l&#8217;estructura del tend&#243; s&#243;n menys cr&#237;tiques&#44; donat que la patologia sembla que t&#233; una reversibilitat limitada &#40;no calen canvis en aquesta regi&#243; per a un bon resultat&#41;&#46; A m&#233;s&#44; el tend&#243; patol&#242;gic sembla que compensa les &#224;rees de desorganitzaci&#243; augmentant les dimensions per mantenir el volum suficient de les estructures amb fibres alineades<span class="elsevierStyleSup">24</span>&#46; Com que la majoria de tendons degeneratius tenen teixit suficient per poder suportar c&#224;rregues&#44; i donada la capacitat limitada de millorar el model de cont&#237;nuum&#44; els tractaments han d&#8217;emprar estrat&#232;gies m&#233;s enll&#224; del cont&#237;nuum&#46; Calen m&#233;s estudis per intentar entendre els tendons que no s&#8217;adapten &#40;i el perqu&#232;&#41;&#46; Aquests tendons podrien ser els que acaben en ruptures tendinoses i s&#243;n els m&#233;s dif&#237;cils d&#8217;estudiar&#44; ja que no presenten cl&#237;nica fins a la ruptura&#46;</p><p class="elsevierStylePara"> Precisament&#44; els tractaments haurien de proposar-se potenciar m&#233;s la capacitat de tolerar c&#224;rregues en les porcions de fibres tendinoses alineades &#40;resist&#232;ncia de c&#224;rrega&#47;zona amb resposta mec&#224;nica&#41; que en estimular o restablir la porci&#243; degenerada&#46; Els exercicis han demostrat que influeixen en ambd&#243;s aspectes&#44; estructura i dolor&#46; Els exercicis exc&#232;ntrics s&#243;n els m&#233;s estudiats i han demostrat que beneficien el dolor&#44; la funcionalitat i el retorn a l&#8217;activitat<span class="elsevierStyleSup">57</span>&#46;</p><p class="elsevierStylePara"> Tot i que el model de cont&#237;nuum classifica la tendinopatia basant-se en la pres&#232;ncia i la quantitat de desorganitzaci&#243; estructural&#44; focalitzar els tractaments per regenerar les &#224;rees desorganitzades podria ser poc &#250;til&#44; ja que el tend&#243; ja pot estar compensat&#46; La millor manera d&#8217;explicar el canvi de concepte pot ser utilitzant la met&#224;fora del d&#242;nut &#40;que seria la zona de fibres alineades&#41; i no el forat &#40;que seria la zona de fibres desorganitzades&#41;&#46; Tanmateix&#44; les zones de fibres alineades soles no protegeixen d&#8217;episodis futurs de tendinopatia reactiva&#59; per tal d&#8217;evitar-ho&#44; els tractaments han d&#8217;evolucionar augmentant la capacitat de tolerar c&#224;rregues a la zona d&#242;nut a trav&#233;s de programes rehabilitadors de c&#224;rregues progressives&#46; &#201;s important considerar les demandes funcionals de l&#8217;individu&#44; ja que sovint diversos aspectes de les c&#224;rregues no es consideren en la rehabilitaci&#243;&#46; Els exercicis exc&#232;ntrics poden ser un tractament efectiu degut a l&#8217;alta c&#224;rrega a qu&#232; sotmeten el tend&#243;&#44; amb l&#8217;objectiu de millorar la capacitat de tolerar c&#224;rregues&#46; Tanmateix&#44; sovint no es plantegen aspectes com la c&#224;rrega del cicle estirament-escur&#231;ament i treball pliom&#232;tric&#44; i aix&#242; podria explicar la insufici&#232;ncia dels tractaments amb el maneig de les c&#224;rregues&#46; A m&#233;s d&#8217;incloure la resta de la cadena cin&#232;tica&#44; caldria proposar un programa que incorpor&#233;s 4 fases de rehabilitaci&#243; &#40;isom&#232;trics per reduir el dolor&#44; isot&#242;nics per restablir la for&#231;a&#44; introduir gradualment exercicis d&#8217;emmagatzemament d&#8217;energia&#44; seguits segons funci&#243; espec&#237;fica de l&#8217;esport&#47;exercicis d&#8217;emmagatzemament i alliberament d&#8217;energia&#41;&#46; Calen m&#233;s estudis per valorar l&#8217;efectivitat d&#8217;aquests tipus de tractaments&#44; malgrat la dificultat en investigar aquesta mena d&#8217;intervencions individualitzades&#46;</p><p class="elsevierStylePara"> En aquest context &#233;s dif&#237;cil trobar la import&#224;ncia dels tractaments dirigits a reparar tendons i normalitzar-ne l&#8217;estructura mitjan&#231;ant factors de creixement<span class="elsevierStyleSup">58</span>&#44; que no sembla que siguin apropiats en el proc&#233;s patol&#242;gic en cap de les fases del cont&#237;nuum&#46; Hi ha una resposta cel&#183;lular tendinosa hiperactiva&#44; i a m&#233;s augmenta el nombre de c&#232;l&#183;lules tendinoses en totes les fases&#44; fins i tot en la fase degenerativa<span class="elsevierStyleSup">59</span>&#46; Sembla desencertat l&#8217;augment de c&#232;l&#183;lules afegides &#40;mare o ten&#242;cits&#41; en ambient hipercel&#183;lular&#44; aix&#237; com restablir una relaci&#243; matriu-c&#232;l&#183;lula viable d&#8217;una regi&#243; degenerada del tend&#243; que no pot transmetre tensi&#243;&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Tractaments dirigits a restablir la funcionalitat i la capacitat de c&#224;rrega</span></p><p class="elsevierStylePara"> Hi ha pocs articles que hagin estudiat la recuperaci&#243; de la funcionalitat de la tendinopatia&#44; perqu&#232; es creu que remetre el dolor i restablir l&#8217;estructura tenen m&#233;s import&#224;ncia&#46; Cl&#237;nicament&#44; s&#8217;observen molts esportistes amb dolor&#44; per&#242; ells nom&#233;s sol&#183;liciten intervenci&#243; m&#232;dica quan els afecta el rendiment&#46; &#201;s dif&#237;cil quantificar funcionalitat i capacitat de c&#224;rrega si les mesures merament de for&#231;a no reflecteixen tot el qu&#232; succeeix&#46; Hi pot haver alteracions graduals del reclutament muscular associat a tendinopatia que ocasionen canvis de la funci&#243;<span class="elsevierStyleSup">32</span>&#46; La tornada a la pr&#224;ctica esportiva &#233;s potencialment una mesura de funcionalitat&#44; tot i que molts estudis s&#8217;han fet fora de la temporada competitiva&#46; Malgrat que la remissi&#243; del dolor elimina una barrera per millorar la funcionalitat&#44; altres d&#232;ficits funcionals&#44; com ara debilitats musculars&#44; alteracions de la cadena cin&#232;tica i incapacitat de tolerar c&#224;rregues&#44; poden predisposar el tend&#243; a sofrir relesions&#46;</p><p class="elsevierStylePara"> Calen m&#233;s estudis per descriure millor els d&#232;ficits funcionals associats a la tendinopatia i desenvolupar eines &#250;tils per als terapeutes&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Discussi&#243;</span></p><p class="elsevierStylePara"> L&#8217;objectiu d&#8217;aquest model &#233;s millorar la comprensi&#243; de les fases de la patologia del tend&#243; i ajudar els terapeutes en el raonament d&#8217;objectius i opcions de tractament&#58; gestionar el dolor i tractar la disfunci&#243;&#46; Malgrat el mecanisme inicial&#44; la patologia del tend&#243; es caracteritza per una resposta cellular significativa a una lesi&#243;<span class="elsevierStyleSup">13&#44;60</span>&#46; &#201;s poc probable que un &#250;nic model pugui descriure tots els aspectes de la patoetiologia tendinosa&#44; la relaci&#243; amb el dolor i la funci&#243;&#44; ja que aquests processos i models s&#243;n complexos&#46; La capacitat de provar el model de cont&#237;nuum est&#224; limitada en part per la tecnologia de diagn&#242;stics per la imatge per detectar canvis estructurals i patol&#242;gics&#44; a m&#233;s de necessitar mesures m&#233;s precises i de major exactitud per quantificar aspectes del dolor i de la disfunci&#243; de les tendinopaties&#46;</p><p class="elsevierStylePara"> Aquest model podria ajudar a millorar les investigacions en tendinopatia&#46; La variabilitat de les respostes dels tractaments podria disminuir&#44; junt amb l&#8217;heterogene&#239;tat dels grups estudiats i de les diferents fases implicades en la patologia&#46; A m&#233;s&#44; molts tractaments s&#243;n invasius&#44; i sabem poca cosa sobre la seva influ&#232;ncia en l&#8217;estructura&#44; i de la resposta a c&#224;rregues o tractaments&#46; Dividint els grups segons el model de cont&#237;nuum&#44; podria donar un resultat m&#233;s clar en els assaigs cl&#237;nics&#44; aix&#237; com millorar les guies cl&#237;niques&#46; &#201;s important tamb&#233; considerar els factors individuals externs al tend&#243;&#44; com edat&#44; gen&#232;tica&#44; sexe&#44; biomec&#224;nica i composici&#243; corporal<span class="elsevierStyleSup">61-63</span>&#46; Se suposa que els factors esmentats alteren la progressi&#243; o la regressi&#243; durant el cont&#237;nuum&#44; i un coneixement m&#233;s aprofundit de l&#8217;impacte d&#8217;aquests factors podria beneficiar el tractament i permetre assistir millor els esportistes en risc&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Conclusions</span></p><p class="elsevierStylePara"> El model de cont&#237;nuum de tendinopatia est&#224; basat en presentacions cl&#237;niques i troballes sobre el tend&#243; a la literatura&#46; Desitgem que permeti millorar el coneixement d&#8217;aquesta condici&#243; tan complexa&#44; i tamb&#233; millorar l&#8217;efic&#224;cia dels tractaments&#46; La investigaci&#243; biom&#232;dica ens recorda que aquest article&#44; com molts altres dels nostres col&#183;legues&#44; nom&#233;s &#233;s una part d&#8217;un cam&#237; llarg i dif&#237;cil per comprendre millor aquesta condici&#243;&#44; i li calen valoracions cont&#237;nues cient&#237;fiques i cl&#237;niques&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Conflicte d&#8217;interessos</span></p><p class="elsevierStylePara"> Els autors declaren que no tenen cap conflicte d&#8217;interessos&#46;</p><hr></hr><p class="elsevierStylePara"> Rebut el 10 d&#8217;abril de 2017&#59;<br></br> acceptat el 2 de maig de 2017</p><p class="elsevierStylePara"> &#42; Autora per a la correspond&#232;ncia&#46;<br></br><span class="elsevierStyleItalic">Correu electr&#242;nic&#58;</span><a href="mailto&#58;silvia&#46;ortega&#64;pl&#46;fcbarcelona&#46;cat" class="elsevierStyleCrossRefs">silvia&#46;ortega&#64;pl&#46;fcbarcelona&#46;cat</a> &#40;S&#46; Ortega-Cebrian&#41;</p>"
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        "resumen" => "<p class="elsevierStylePara"> El model de cont&#237;nuum fou proposat per Cook i Purdam el 2009&#44; amb l&#8217;objectiu de millorar la comprensi&#243; del marc complex que envolta la patologia del tend&#243;&#46; El cont&#237;nuum es basa en les caracter&#237;stiques dels tres estats tissulars del tend&#243;&#58; tend&#243; reactiu&#44; tend&#243; desestructurat i tend&#243; degeneratiu&#44; i es diferencia d&#8217;altres propostes per la visi&#243; de canvi continu de l&#8217;estructura del teixit tendin&#243;s&#44; segons la capacitat de tolerar c&#224;rregues&#46; Cada fase t&#233; una presentaci&#243; cl&#237;nica caracter&#237;stica i un tractament espec&#237;fic&#46; Estudis histol&#242;gics&#44; per imatge i cl&#237;nics&#44; corroboren amb evid&#232;ncia l&#8217;abordatge d&#8217;aquesta patologia a trav&#233;s del concepte del model de cont&#237;nuum&#46;</p>"
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        "resumen" => "<p class="elsevierStylePara"> Cook and Purdam first proposed the Continuum model in 2009&#44; with the aim of improving the understanding of the complexity of tendon pathologies&#46; The Continuum is based on three states of tendon structure&#58; reactive tendon&#44; tendon disrepair and degenerative tendon&#46; In contrast to other proposals&#44; the Continuum model describes continuous changes in tendon structure&#46; Each state of tendon structure represents a particular clinical presentation and requires a particular type of management&#46; Evidence seen in histopathological studies&#44; imaging and clinical studies all support the Continuum model for the analysis of tendon pathologies&#46;</p>"
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Article information
ISSN: X8866581
Original language: Català
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2019 September 34 23 57
2019 August 37 11 48
2019 July 24 17 41
2019 June 28 33 61
2019 May 40 35 75
2019 April 39 65 104
2019 March 24 25 49
2019 February 20 25 45
2019 January 29 36 65
2018 December 30 41 71
2018 November 33 31 64
2018 October 44 21 65
2018 September 28 22 50
2018 August 27 22 49
2018 July 118 56 174
2018 June 50 48 98
2018 May 26 31 57
2018 April 23 12 35
2018 March 41 14 55
2018 February 33 10 43
2018 January 36 21 57
2017 December 69 33 102
2017 November 67 38 105
2017 October 53 33 86
2017 September 69 30 99
2017 August 46 15 61
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