<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1646-2122</journal-id>
<journal-title><![CDATA[Revista Portuguesa de Ortopedia e Traumatologia]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Port. Ortop. Traum.]]></abbrev-journal-title>
<issn>1646-2122</issn>
<publisher>
<publisher-name><![CDATA[Sociedade Portuguesa de Ortopedia e Traumatologia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1646-21222016000400006</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Meniscectomia parcial e risco de gonartrose]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moura]]></surname>
<given-names><![CDATA[Diogo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Marques]]></surname>
<given-names><![CDATA[Pedro]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fonseca]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Centro Hospitalar e Universitário de Coimbra Serviço de Ortopedia e Traumatologia ]]></institution>
<addr-line><![CDATA[Coimbra ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<volume>24</volume>
<numero>4</numero>
<fpage>277</fpage>
<lpage>288</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S1646-21222016000400006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S1646-21222016000400006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S1646-21222016000400006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[A meniscetomia parcial artroscópica é atualmente um dos procedimentos ortopédicos mais frequentes. No entanto, apesar dos resultados da meniscetomia parcial artroscópica a curto prazo serem excelentes, a avaliação a longo prazo não é satisfatória em termos de sinais radiográficos de gonartrose precoce. Atualmente é aceite que qualquer grau de meniscectomia é um fator de risco para o desenvolvimento precoce de osteoartrose do joelho e que existe uma correlação consistente entre a quantidade de menisco ressecado ou, em outras palavras, a quantidade de tecido meniscal funcional remanescente, e o desenvolvimento de alterações degenerativas articulares do joelho. O objetivo deste artigo é realizar uma revisão bibliográfica acerca da meniscectomia parcial e o risco de gonartrose, procurando rever a sua base biomecânica e os estudos sobre os resultados da meniscectomia parcial a longo prazo. Para isso foi realizada uma pesquisa na base de dados Pubmed/Medline com as palavras “Partial meniscectomy” e “Knee osteoarthritis” e foram seleccionados sobretudo artigos publicados nos últimos 10 anos e em língua inglesa, incluindo artigos originais e de revisão.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Arthroscopic partial meniscectomy is currently one of the most common orthopedic procedures performed. However, whereas the short-term results of arthroscopic partial meniscectomy are excellent, evaluation of the long-term is not satisfactory in terms of radiographic signs of early osteoarthritis of the knee. Currently it is accepted that any amount of meniscectomy is a risk factor to early onset of osteoarthritis and that a strong correlation exists between the amount of the resected meniscus or in other words the amount remaining functional meniscal tissue and the development of degenerative changes in the knee. This paper’s goal is to perform a literature review about partial meniscectomy and its risk for early knee osteoarthritis, looking to approach its biomechanical basis and the trials about partial meniscectomy long-term outcomes. A research at database Pubmed/Medline by the words “Partial meniscectomy” and “Knee osteoarthritis” was performed and mainly last 10 year english language papers were selected, including original and review articles.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[Meniscectomia parcial]]></kwd>
<kwd lng="pt"><![CDATA[menisco]]></kwd>
<kwd lng="pt"><![CDATA[roturas]]></kwd>
<kwd lng="pt"><![CDATA[tratamento]]></kwd>
<kwd lng="pt"><![CDATA[joelho]]></kwd>
<kwd lng="pt"><![CDATA[artroscopia]]></kwd>
<kwd lng="pt"><![CDATA[gonartrose]]></kwd>
<kwd lng="en"><![CDATA[Partial meniscectomy]]></kwd>
<kwd lng="en"><![CDATA[meniscu]]></kwd>
<kwd lng="en"><![CDATA[ruptures]]></kwd>
<kwd lng="en"><![CDATA[treatment]]></kwd>
<kwd lng="en"><![CDATA[knee]]></kwd>
<kwd lng="en"><![CDATA[arthroscopy]]></kwd>
<kwd lng="en"><![CDATA[knee osteoarthritis]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><b><font face="Verdana" size="2">ARTIGO DE REVISÃO</font></b></p>    <p>&nbsp;</p>    <p><b><font face="Verdana" size="4">Meniscectomia parcial e risco de gonartrose</font></b></p>    <p>&nbsp;</p>    <p><font face="Verdana" size="2"><b>Diogo Moura<sup>I</sup></b>; <b>Pedro Marques<sup>I</sup></b>; <b>Fernando Fonseca<sup>I</sup></b></font></p>    <p><font face="Verdana" size="2">I. Serviço de Ortopedia e Traumatologia, Centro Hospitalar e Universitário de Coimbra. Coimbra.<br /></font></p>    <p>&nbsp;</p>    <p><font face="Verdana" size="2"><a name="topc"></a><a href="#c">Endereço para correspondência</a></font></p>    <p>&nbsp;</p>    <p><b><font face="Verdana" size="2">RESUMO</font></b></p><font face="verdana" size="2">    ]]></body>
<body><![CDATA[<p>A meniscetomia parcial artrosc&oacute;pica &eacute; atualmente um dos procedimentos ortop&eacute;dicos mais frequentes. No entanto, apesar dos resultados da meniscetomia parcial artrosc&oacute;pica a curto prazo serem excelentes, a avalia&ccedil;&atilde;o a longo prazo n&atilde;o &eacute; satisfat&oacute;ria em termos de sinais radiogr&aacute;ficos de gonartrose precoce. Atualmente &eacute; aceite que qualquer grau de meniscectomia &eacute; um fator de risco para o desenvolvimento precoce de osteoartrose do joelho e que existe uma correla&ccedil;&atilde;o consistente entre a quantidade de menisco ressecado ou, em outras palavras, a quantidade de tecido meniscal funcional remanescente, e o desenvolvimento de altera&ccedil;&otilde;es degenerativas articulares do joelho. O objetivo deste artigo &eacute; realizar uma revis&atilde;o bibliogr&aacute;fica acerca da meniscectomia parcial e o risco de gonartrose, procurando rever a sua base biomec&acirc;nica e os estudos sobre os resultados da meniscectomia parcial a longo prazo. Para isso foi realizada uma pesquisa na base de dados <em>Pubmed/Medline</em> com as palavras &ldquo;<em>Partial meniscectomy</em>&rdquo; e &ldquo;<em>Knee osteoarthritis</em>&rdquo; e foram seleccionados sobretudo artigos publicados nos &uacute;ltimos 10 anos e em l&iacute;ngua inglesa, incluindo artigos originais e de revis&atilde;o.</p></font>    <p><font face="verdana" size="2"><b>Palavras chave</b>: Meniscectomia parcial, menisco, roturas, tratamento, joelho, artroscopia, gonartrose. </font></p>    <p>&nbsp;</p>    <p><b><font face="Verdana" size="2">ABSTRACT</font></b></p><font face="verdana" size="2">    <p>Arthroscopic partial meniscectomy is currently one of the most common orthopedic procedures performed. However, whereas the short-term results of arthroscopic partial meniscectomy are excellent, evaluation of the long-term is not satisfactory in terms of radiographic signs of early osteoarthritis of the knee. Currently it is accepted that any amount of meniscectomy is a risk factor to early onset of osteoarthritis and that a strong correlation exists between the amount of the resected meniscus or in other words the amount remaining functional meniscal tissue and the development of degenerative changes in the knee. This paper&rsquo;s goal is to perform a literature review about partial meniscectomy and its risk for early knee osteoarthritis, looking to approach its biomechanical basis and the trials about partial meniscectomy long-term outcomes. A research at database Pubmed/Medline by the words &ldquo;Partial meniscectomy&rdquo; and &ldquo;Knee osteoarthritis&rdquo; was performed and mainly last 10 year english language papers were selected, including original and review articles. </p></font>    <p><font face="verdana" size="2"><b>Key words</b>: Partial meniscectomy, meniscu, ruptures, treatment, knee, arthroscopy, knee osteoarthritis. </font></p>    <p>&nbsp;</p>    <p><b><font face="Verdana" size="2">INTRODUÇÃO</font></b></p><font face="verdana" size="2">    <p>A meniscectomia parcial &eacute; atualmente um dos procedimentos cir&uacute;rgicos mais frequentes na cirurgia ortop&eacute;dica e na medicina desportiva<sup>1,2,3</sup>. A meniscectomia parcial artrosc&oacute;pica surgiu como alternativa &agrave; cl&aacute;ssica meniscectomia total aberta devido &agrave; associa&ccedil;&atilde;o da aus&ecirc;ncia de menisco com r&aacute;pida progress&atilde;o para gonartrose<sup>4,5,6,7,8,9,10,11,12,13</sup>. A meniscectomia parcial artrosc&oacute;pica est&aacute; atualmente claramente indicada nas roturas meniscais traum&aacute;ticas agudas inst&aacute;veis, irrepar&aacute;veis, sintom&aacute;ticas (em particular com sintomas mec&acirc;nicos) e cujo tratamento conservador sintom&aacute;tico inicial n&atilde;o teve sucesso.</p>
    <p>O objetivo da meniscectomia parcial &eacute; remover o tecido meniscal inst&aacute;vel afetado pela rotura e ao mesmo tempo preservar o m&aacute;ximo poss&iacute;vel de tecido meniscal perif&eacute;rico est&aacute;vel e funcional<sup>1</sup>. Os resultados cl&iacute;nicos, funcionais e radiogr&aacute;ficos da meniscectomia s&atilde;o muito satisfat&oacute;rios a curto e m&eacute;dio prazo, proporcionando um al&iacute;vio eficaz dos sintomas da rotura meniscal<sup>14,15,16,17</sup>. No entanto, apesar dos resultados cl&iacute;nicos a longo prazo serem tamb&eacute;m favor&aacute;veis, v&aacute;rios estudos t&ecirc;m verificado a longo prazo (seguimento superior a 10 anos) sinais importantes de gonartrose precoce nos pacientes submetidos a meniscectomia parcial<sup>18,19,20,21,22,23</sup>. Neste artigo apresentamos uma revis&atilde;o da literatura cient&iacute;fica acerca da biomec&acirc;nica da meniscectomia parcial e dos riscos associados de evolu&ccedil;&atilde;o para gonartrose precoce.</p></font>    ]]></body>
<body><![CDATA[<p>&nbsp;</p>    <p><b><font face="Verdana" size="2">BIOMECÂNICA DA MENISCECTOMIA</font></b></p><font face="verdana" size="2">    <p>As superf&iacute;cies articulares do joelho s&atilde;o altamente incongruentes na medida em que os c&ocirc;ndilos femorais convexos articulam com as superf&iacute;cies articulares tibiais praticamente planas. O aumento da profundidade das superf&iacute;cies tibiais pelos meniscos permite um encaixe mais eficaz destas com os c&ocirc;ndilos femorais e assim garantir a congru&ecirc;ncia articular, bem como tamb&eacute;m uma estabiliza&ccedil;&atilde;o &acirc;ntero-posterior adicional ao joelho. A forma semilunar e em cunha dos meniscos adaptada &agrave; morfologia femoral permite que os v&eacute;rtices dos c&ocirc;ndilos femorais estejam sempre no centro meniscal, assegurando assim a congru&ecirc;ncia necess&aacute;ria para o funcionamento do joelho. Ao mesmo tempo, os meniscos aumentam a superf&iacute;cie articular de contacto e assim garantem uma distribui&ccedil;&atilde;o mais uniforme das cargas que s&atilde;o transmitidas atrav&eacute;s dos mesmos. Esta fun&ccedil;&atilde;o meniscal &eacute; fundamental, na medida em que ao garantirem uma menor press&atilde;o de contacto articular, os meniscos protegem a cartilagem face a cargas mec&acirc;nicas excessivas e potencialmente lesivas. Sendo assim, faz sentido que a aus&ecirc;ncia de menisco diminua a congru&ecirc;ncia f&eacute;moro-tibial, passando no compartimento lateral mesmo a haver contacto direto entre superf&iacute;cies articulares femoral convexa e tibial tamb&eacute;m convexa. A diminui&ccedil;&atilde;o da congru&ecirc;ncia articular e a aus&ecirc;ncia de uma estrutura de amortecimento de choques, de uniformiza&ccedil;&atilde;o da distribui&ccedil;&atilde;o de cargas e de estabiliza&ccedil;&atilde;o secund&aacute;ria do joelho conduzem a que se verifique uma transmiss&atilde;o de cargas excessiva diretamente sobre a cartilagem articular (diminui&ccedil;&atilde;o da capacidade de amortecimento e absor&ccedil;&atilde;o de cargas e aumento da press&atilde;o de contacto), o que favorece a sua les&atilde;o e o desenvolvimento de osteoporose<sup>1,11,24,25,26,27,28,29,30,31,32,33,34,35,36,37</sup>. A pr&oacute;pria altera&ccedil;&atilde;o da cinem&aacute;tica do joelho provocada pela meniscectomia ou apenas por uma rotura meniscal, ao interferir com a sua morfologia e consequentemente com as suas fun&ccedil;&otilde;es de amortecimento de cargas e de estabiliza&ccedil;&atilde;o secund&aacute;ria, pode transferir as regi&otilde;es de contacto t&iacute;bio-femoral para &aacute;reas da cartilagem articular n&atilde;o adaptadas a tais cargas (redistribui&ccedil;&atilde;o de &aacute;reas de contacto), e proporcionar altera&ccedil;&otilde;es no metabolismo condral que podem desencadear a cascata de degenera&ccedil;&atilde;o osteoarticular. Estes dados s&atilde;o importantes na medida em que a espessura, o metabolismo e as caracter&iacute;sticas morfol&oacute;gicas da cartilagem articular variam regionalmente de acordo com as cargas implicadas. Al&eacute;m disso, foi demonstrada uma diferen&ccedil;a significativa nas propriedades mec&acirc;nicas condrais e do osso subcondral da cartilagem articular n&atilde;o coberta pelos meniscos, que se encontra mais adaptada a cargas, em compara&ccedil;&atilde;o com a que se encontra protegida pelos meniscos<sup>38,39,40,41,42</sup>. Estudos a longo prazo em crian&ccedil;as submetidas a meniscectomia total por menisco disc&oacute;ide demonstraram sinais radiogr&aacute;ficos de osteoartrose em 86 a 100% dos casos<sup>4,43,44,45,46,47,48,49,50</sup>. Baratz et al.<sup>26</sup> demonstraram que o aumento da press&atilde;o de contacto articular &eacute; inversamente proporcional &agrave; &aacute;rea de contacto f&eacute;muro-tibial: ap&oacute;s uma meniscectomia parcial a &aacute;rea de contacto f&eacute;muro-tibial diminui cerca de 10%, o que provoca um aumento da press&atilde;o de contacto local de aproximadamente 65%; por sua vez uma meniscectomia total diminui a &aacute;rea de contacto em 75%, o que provoca um aumento do stress de contacto de 235%. Um estudo verificou que, em compara&ccedil;&atilde;o com a meniscectomia parcial, o risco relativo de desenvolver osteoartrose radiogr&aacute;fica era de mais 2.2 vezes ap&oacute;s meniscectomia subtotal e de mais 3.6 vezes ap&oacute;s meniscectomia total<sup>51</sup>.</p>
    <p>Atualmente, a meniscectomia parcial artrosc&oacute;pica est&aacute; indicada para o tratamento das roturas meniscais sintom&aacute;ticas irrepar&aacute;veis, devendo ser excisado o m&iacute;nimo poss&iacute;vel de menisco necess&aacute;rio para o tratamento adequado da rotura. O objetivo deve ser preservar o mais poss&iacute;vel da anatomia nativa do menisco, para o qual toda a estrutura m&uacute;sculo-ligamentar do joelho sempre esteve adaptada, procurando manter a efici&ecirc;ncia das fun&ccedil;&otilde;es meniscais de uniformiza&ccedil;&atilde;o de cargas e de prote&ccedil;&atilde;o da cartilagem articular, diminuindo assim, em teoria, o risco de osteoartrose<sup>1,52,53</sup>. Apesar da meniscectomia parcial estar a associada a menor risco de progress&atilde;o para osteoartrose em compara&ccedil;&atilde;o com a meniscectomia total, a rela&ccedil;&atilde;o entre a excis&atilde;o meniscal e o desenvolvimento de osteoartrose mant&eacute;m-se mesmo para a meniscectomia parcial. Os meniscos s&atilde;o de facto estruturas essenciais para o equil&iacute;brio do joelho em termos de uniformiza&ccedil;&atilde;o de cargas e prote&ccedil;&atilde;o da cartilagem articular, sendo que a altera&ccedil;&atilde;o da sua morfologia, mesmo que parcial, seja por roturas ou por meniscectomias, aumenta o risco de desenvolvimento de osteoartrose do joelho e de necessidade de substitui&ccedil;&atilde;o artropl&aacute;stica do joelho no futuro<sup>1,3,52,54,55.56</sup>.</p></font>    <p>&nbsp;</p>    <p><b><font face="Verdana" size="2">MENISCECTOMIA PARCIAL E OSTEOARTROSE</font></b></p><font face="verdana" size="2">    <p>Os estudos que demonstram resultados a longo prazo, isto &eacute;, com tempo m&iacute;nimo de seguimento superior a 10 anos, ap&oacute;s meniscectomias parciais s&atilde;o escassos, heterog&eacute;neos e a larga maioria retrospetivos. Os seus dados est&atilde;o resumidos na <a href="/img/revistas/rpot/v24n4/24n4a06t1.jpg">tabela 1</a> <sup>1,18,19,20,21,22,23,53,57,58</sup>.</p>    
<p>&nbsp;</p>    <p>    <center><a href="/img/revistas/rpot/v24n4/24n4a06t1.jpg">Tabela 1</a></center></p>    
]]></body>
<body><![CDATA[<p>&nbsp;</p>
    <p>De modo geral, todos os estudos a longo prazo apresentados demonstraram entre 80 a 100% de resultados cl&iacute;nicos e funcionais muito satisfat&oacute;rios e 95% dos pacientes encontravam-se satisfeitos ou muitos satisfeitos ap&oacute;s meniscectomia parcial artrosc&oacute;pica. No entanto, cerca de 20 a 80% dos joelhos submetidos a meniscectomia parcial desenvolveram sinais radiogr&aacute;ficos gonartrose precoce, o que representou uma diferen&ccedil;a estatisticamente significativa quando comparados com controlos. Apesar disto, nenhum dos pacientes com sinais radiogr&aacute;ficos de gonartrose precoce demonstrou quaisquer sintomas de osteoartrose<sup>1,18,19,20,21,22,23,53,57,58</sup>. Tal como outros autores confirmaram, na maioria dos estudos os sintomas e o grau funcional do paciente n&atilde;o demonstraram correla&ccedil;&atilde;o com os sinais radiogr&aacute;ficos de osteoartrose<sup>1,12,18,19,20,21,22,23</sup>.</p>
    <p>Fauno e Nielsen<sup>20</sup> estudaram prospetivamente 136 pacientes submetidos a meniscectomias parciais por roturas em <em>flap</em> e em asa de cesto. Os autores classificaram os sinais radiogr&aacute;ficos de acordo com&nbsp; a classifica&ccedil;&atilde;o de Fairbank<sup>59</sup> e verificaram que 53% dos joelhos operados apresentavam pelo menos uma altera&ccedil;&atilde;o de Fairbank, em compara&ccedil;&atilde;o com apenas 22% nos joelhos contralaterais n&atilde;o operados. N&atilde;o foram identificadas diferen&ccedil;as significativas em termos de progress&atilde;o para gonartrose entre os dois tipos de roturas meniscais. Chatain et al.<sup>19</sup> compararam ao longo de tempo m&eacute;dio de 15 anos de seguimento os resultados da meniscectomia parcial artrosc&oacute;pica medial com a lateral em 448 pacientes e identificaram diferen&ccedil;as significativas entre os joelhos operados e os contra-laterais quando &agrave; instala&ccedil;&atilde;o de sinais radiogr&aacute;ficos de osteoartrose, ocorrendo em 29.5% dos submetidos a meniscectomia medial e em 42.2% dos submetidos a meniscectomia lateral. Os piores resultados cl&iacute;nicos e radiogr&aacute;ficos da meniscectomia parcial lateral poder&atilde;o estar relacionados com a maior incongru&ecirc;ncia das superf&iacute;cies articulares f&eacute;mo-rotibiais no compartimento lateral em compara&ccedil;&atilde;o com o medial e &agrave; consequente altera&ccedil;&atilde;o biomec&acirc;nica mais favorecedora de osteoartrose ap&oacute;s resse&ccedil;&atilde;o meniscal. Foi tamb&eacute;m destacado neste estudo que apenas 0.2% dos pacientes submetidos a meniscectomia parcial foram submetidos a uma interven&ccedil;&atilde;o cir&uacute;rgica devido ao desenvolvimento de osteoartrose sintom&aacute;tica, isto &eacute;, apenas 1 paciente foi submetido a uma osteotomia tibial. Por sua vez, Englund M et al.<sup>57</sup> estudaram retrospetivamente 155 pacientes com idade m&eacute;dia de 54 anos com tempo m&eacute;dio de seguimento de 16 anos e identificaram um risco 4.8 vezes superior de osteoartrose radiogr&aacute;fica e 2.6 vezes superior de osteoartrose sintom&aacute;tica nos pacientes submetidos a meniscectomia parcial em compara&ccedil;&atilde;o com os controlos. O risco mais elevado de osteoartrose esteve relacionado com roturas meniscais degenerativas e resse&ccedil;&otilde;es meniscais extensas. Rockborn and Gilquist<sup>22</sup> estudaram retrospetivamente 44 meniscectomias que incluiam resse&ccedil;&otilde;es meniscais parciais e subtotais e verificaram&nbsp; uma diferen&ccedil;a estatisticamente significativa entre os grupos, com piores resultados em termos de sinais radiogr&aacute;ficos de gonartrose nos pacientes submetidos a meniscectomia subtotal (87.5%)em compara&ccedil;&atilde;o com a meniscectomia parcial (48.57%).</p>
    <p>Foram tamb&eacute;m encontrados significativamente mais sinais radiogr&aacute;ficos de gonartrose nos joelhos operados (60.1%) em compara&ccedil;&atilde;o com os joelhos contra-laterais (15.15%). Um estudo efetuado em 29 pacientes submetidos a meniscectomia parcial medial (8.4 anos de tempo de seguimento) e lateral (7.1 anos de tempo de seguimento) isoladas, identificaram atrav&eacute;s de resson&acirc;ncias magn&eacute;ticas &iacute;ndices de 64% de osteoartrose no compartimento medial no grupo da meniscectomia medial versus 33% no compartimento lateral no grupo da meniscectomia lateral, correspondendo a graus II, III e IV da classifica&ccedil;&atilde;o de Outerbridge<sup>61</sup>. Outros estudos que recorreram a resson&acirc;ncia magn&eacute;tica confirmam estes resultados e detetaram mesmo&nbsp; les&otilde;es condrais nos primeiros 5 anos ap&oacute;s a excis&atilde;o meniscal<sup>62,63</sup>. Eichinger M et al.<sup>64</sup> fizeram avalia&ccedil;&otilde;es prospetivas aos 6,12 e 24 meses ap&oacute;s a meniscectomia parcial e identificaram atrav&eacute;s de resson&acirc;ncia magn&eacute;tica evid&ecirc;ncia de les&otilde;es condrais progressivas ap&oacute;s a interven&ccedil;&atilde;o meniscal, que atingiam n&atilde;o apenas o compartimento t&iacute;bio-femoral do lado da meniscectomia, mas tamb&eacute;m o contra-lateral e a articula&ccedil;&atilde;o patelo-femoral. Por sua vez, uma an&aacute;lise com resson&acirc;ncia magn&eacute;tica T1 e T2 com mapeamento do tempo de relaxamento, identificou que a meniscectomia parcial afetou a composi&ccedil;&atilde;o bioqu&iacute;mica da cartilagem articular logo aos 6 meses ap&oacute;s a meniscectomia<sup>42</sup>. As altera&ccedil;&otilde;es foram mais acentuadas nas &aacute;reas de carga e na cartilagem imediatamente adjacente &agrave; resse&ccedil;&atilde;o meniscal, o que sugere a implica&ccedil;&atilde;o da meniscectomia parcial na altera&ccedil;&atilde;o da cinem&aacute;tica do joelho. Por sua vez, Englund et al.<sup>65</sup> estudaram prospetivamente 121 pacientes (50 a 79 anos) com roturas meniscais sintom&aacute;ticas submetidos a tratamento conservador e sem sinais de gonartrose pr&eacute;via e verificaram um aumento dos sinais radiogr&aacute;ficos de osteoartrose ap&oacute;s 30 meses de tempo m&eacute;dio de seguimento, concluindo que a pr&oacute;pria rotura meniscal, ao comprometer a integridade morfol&oacute;gica e funcional do menisco, tamb&eacute;m &eacute; um fator de risco para o desenvolvimento de gonartrose. O estudo retrospetivo de Roemer FW et al.<sup>3</sup> em 355 joelhos verificou que todos os pacientes submetidos a meniscectomia parcial (n=31) em compara&ccedil;&atilde;o com apenas 58.9% (n=165) dos joelhos com rotura meniscal n&atilde;o operados desenvolveram sinais radiogr&aacute;ficos de osteoartrose no ano seguinte &agrave; cirurgia ou &agrave; les&atilde;o. A meniscectomia parcial foi considerada um fator de risco significativo para agravamento da les&atilde;o condral (<em>odds ratio</em>=4.51).</p>
    <p>Atualmente v&aacute;rios autores defendem que nenhum grau de meniscectomia &eacute; in&oacute;cuo e que o risco aumentado de progress&atilde;o para osteoartrose est&aacute; diretamente relacionado com a quantidade de menisco funcional que &eacute; preservado ap&oacute;s uma meniscectomia parcial. A intera&ccedil;&atilde;o topogr&aacute;fica entre meniscos e cartilagem articular do joelho, isto &eacute;, o grau de cobertura da superf&iacute;cie articular tibial pelos meniscos, est&aacute; diretamente relacionado com a sua efic&aacute;cia funcional em termos de amortecimento de choques e prote&ccedil;&atilde;o da cartilagem articular. Quando este equil&iacute;brio &eacute; alterado, seja por les&otilde;es meniscais, por meniscectomias parciais ou mesmo suturas meniscais, a prote&ccedil;&atilde;o da cartilagem articular est&aacute; em risco e o prov&aacute;vel favorecimento de cargas assim&eacute;tricas anormais aumenta o risco de les&otilde;es condrais e como tal o de progress&atilde;o para gonartrose precoce<sup>1,3,39,43,51,52,53,54,55,56,65,66,67</sup>.</p>
    <p>Atualmente, a meniscectomia parcial, mas tamb&eacute;m as pr&oacute;prias roturas meniscais, s&atilde;o portanto consideradas fatores de risco para gonartrose precoce e a quantidade de menisco ressecado &eacute; o fator de risco mais consistentemente associado ao seu aparecimento nestes pacientes. A presen&ccedil;a de outros fatores de risco para osteoartrose nestes pacientes, tais como menicectomia lateral em compara&ccedil;&atilde;o com a medial, idade superior a 40 anos, excesso de peso, deformidades angulares do joelho, desequil&iacute;brios ligamentares e les&otilde;es condrais pr&eacute;vias (associada tamb&eacute;m &agrave; presen&ccedil;a de roturas meniscais degenerativas por serem parte do processo evolutivo da osteoartrose), ter&aacute; como consequ&ecirc;ncia a acelera&ccedil;&atilde;o do processo degenerativo articular<sup>18,20,21,24,43,52,53,57,58,65,68,69,70,71,72</sup>. Um estudo biomec&acirc;nico demonstrou que as meniscectomias parciais s&atilde;o mais prejudiciais a favorecer o desenvolvimento de les&otilde;es condrais em compara&ccedil;&atilde;o com as respetivas roturas meniscais<sup>34</sup>. A justifica&ccedil;&atilde;o &eacute; que os fragmentos da rotura meniscal preservam ainda alguma fun&ccedil;&atilde;o de distribui&ccedil;&atilde;o de cargas, enquanto o mesmo n&atilde;o se verifica ap&oacute;s a sua excis&atilde;o. Desta maneira, atualmente muitos estudos abordam a preserva&ccedil;&atilde;o meniscal e o desenvolvimento de t&eacute;cnicas de repara&ccedil;&atilde;o e reconstru&ccedil;&atilde;o meniscal. A sutura, as matrizes, os implantes e os transplantes meniscais, ao permitirem preservar de forma mais eficaz a morfologia meniscal, poder&atilde;o ter vantagens em compara&ccedil;&atilde;o com a meniscectomia na diminui&ccedil;&atilde;o da progress&atilde;o para gonartrose ap&oacute;s rotura meniscal<sup>52</sup>.</p>
    <p>Apesar de terem indica&ccedil;&otilde;es diferentes e s&oacute; ser poss&iacute;vel repara&ccedil;&atilde;o com sutura em cerca de 5% das roturas meniscais, um estudo verificou que a longo prazo a sutura meniscal est&aacute; associada a menores taxas de sinais radiogr&aacute;ficos de osteoartrose em compara&ccedil;&atilde;o com a meniscectomia parcial de forma estatisticamente significativa (80.8% dos joelhos sem sinais de artrose ap&oacute;s sutura meniscal versus apenas 40% ap&oacute;s meniscectomia parcial)<sup>69</sup>. Al&eacute;m disso, os autores verificaram que o n&iacute;vel funcional pr&eacute;vio &agrave; rotura meniscal foi recuperado em 96.2% dos pacientes submetidos a repara&ccedil;&atilde;o meniscal em compara&ccedil;&atilde;o com apenas 50% dos submetidos a meniscectomia parcial, o que tamb&eacute;m constituiu uma diferen&ccedil;a estatisticamente significativa. Estes resultados sugerem a import&acirc;ncia da manuten&ccedil;&atilde;o ao m&aacute;ximo de tecido meniscal funcional aquando de uma meniscectomia tanto em resultados cl&iacute;nicos como radiogr&aacute;ficos<sup>26,69,70,73</sup>. Os autores justificam que a presen&ccedil;a de sinais de osteoartrose precoce ap&oacute;s sutura meniscal poder&aacute; estar associada &agrave; qualidade inferior e funcionalidade menos eficiente do tecido meniscal ap&oacute;s sutura por cicatriza&ccedil;&atilde;o incompleta ou desenvolvimento de tecido fibr&oacute;tico<sup>69,74,75</sup>. Rubman MH et al.<sup>76</sup> sugerem e referem bons resultados com repara&ccedil;&otilde;es de roturas meniscais mesmo com extens&atilde;o para a zona avascular em pacientes selecionados com elevado risco de desenvolvimento de osteoartrose, particularmente desportistas com menos de 40 anos de idade. Os autores referem que apesar de terem 20% de taxa de re-opera&ccedil;&atilde;o na sua s&eacute;rie, os benef&iacute;cios de potencialmente reconstruir um menisco funcional que permita uma prote&ccedil;&atilde;o eficaz da cartilagem articular eevite o desenvolvimento de les&otilde;es osteoartr&oacute;sicas precoces, s&atilde;o superiores ao risco de necessidade de nova cirurgia. Por sua vez, e apesar dos dados serem ainda preliminares, alguns estudos indicam que os implantes sint&eacute;ticos e o transplante meniscal al&oacute;geno poder&atilde;o, tamb&eacute;m pelo princ&iacute;pio da restaura&ccedil;&atilde;o da morfologia meniscal original, estar associados a menor taxa de progress&atilde;o para osteoartrose precoce a longo prazo<sup>52,77,78,79</sup>.</p>
    <p>V&aacute;rios estudos experimentais em termos de medicina regenerativa est&atilde;o atualmente em curso com o objetivo de encontrar um tratamento eficaz das roturas meniscais que mantenha ao m&aacute;ximo a anatomia meniscal original e evite a progress&atilde;o para osteoartrose, em particular a utiliza&ccedil;&atilde;o de fatores de crescimento, matrizes, implantes, cultura de tecidos e c&eacute;lulas estaminais<sup>52</sup>.</p></font>    <p>&nbsp;</p>    <p><b><font face="Verdana" size="2">CONCLUSÃO</font></b></p><font face="verdana" size="2">    ]]></body>
<body><![CDATA[<p>Em suma, apesar dos resultados cl&iacute;nico-funcionais a curto, m&eacute;dio e longo prazo dos pacientes submetidos a meniscectomia parcial por rotura meniscal sintom&aacute;tica irrepar&aacute;vel serem muito satisfat&oacute;rios, os resultados radiogr&aacute;ficos a longo prazo (seguimento superior a 10 anos) n&atilde;o s&atilde;o favor&aacute;veis, apresentando uma taxa elevada de aparecimento de sinais de gonartrose precoce. Atualmente existe evid&ecirc;ncia cient&iacute;fica que nenhum grau de meniscectomia &eacute; in&oacute;cuo e que o risco aumentado de progress&atilde;o para osteoartrose precoce depende da quantidade de menisco funcional que &eacute; preservado ap&oacute;s uma meniscectomia parcial. A meniscectomia parcial &eacute; um fator de risco para o desenvolvimento precoce de gonartrose, mas a pr&oacute;pria rotura meniscal e qualquer desequil&iacute;brio da rela&ccedil;&atilde;o topogr&aacute;fica protetora entre meniscos e cartilagem articular tamb&eacute;m o s&atilde;o. A sutura e o transplante meniscais, ao permitirem preservar a morfologia meniscal, poder&atilde;o ter vantagens em compara&ccedil;&atilde;o com a meniscectomia parcial na diminui&ccedil;&atilde;o da progress&atilde;o para gonartrose ap&oacute;s rotura meniscal. S&atilde;o necess&aacute;rios mais estudos prospetivos aleatorizados com tempo de seguimento superior de modo a definir o procedimento terap&ecirc;utico ideal para melhoria sintom&aacute;tica destes pacientes a curto prazo e ao mesmo tempo evitar ao m&aacute;ximo o desenvolvimento de gonartrose precoce a longo prazo. A evid&ecirc;ncia cient&iacute;fica atual acerca dos riscos de osteoartrose ap&oacute;s meniscectomia parcial deve levar os cirurgi&otilde;es ortop&eacute;dicos a ponderar e a discutir cuidadosamente com o paciente os riscos e benef&iacute;cios da escolha desta op&ccedil;&atilde;o terap&ecirc;utica.&nbsp;</p></font>    <p>&nbsp;</p>    <p><b><font face="Verdana" size="2">REFERÊNCIAS BIBLIOGRÁFICAS</font></b></p>    <p><font face="verdana" size="2">1. Petty CA, Lubowitz JH. Does arthroscopic partial meniscectomy always cause arthritis?. Sports Med Arthrosc. 2012 Jun; 20 (2): 58-61</font></p>    <p><font face="verdana" size="2">2. Fabricant PD, Jokl P. Surgical outcomes after arthroscopic partial meniscectomy. J Am Acad Orthop Surg. 2007 Nov; 15 (11): 647-653</font></p>    <p><font face="verdana" size="2">3. Roemer FW, Kwoh CK, Hannon MJ. Partial meniscectomy is associated with increased risk of incident radiographic osteoarthritis and worsening cartilage damage in the following year. Eur Radiol. 2017 Jan; 27 (1): 404-413</font></p>    <p><font face="verdana" size="2">4. Räber DA, Friederich NF, Hefti F. Discoid lateral meniscus in children. Long-term follow-up after total meniscectomy. J Bone Joint Surg Am. 1998 Nov; 80 (11): 1579-1586</font></p>    <p><font face="verdana" size="2">5. Jorgensen U, Sonne-Holm S, Lauridsen F. Long-term follow-up of meniscectomy in athletes. A prospective longitudinal study. J Bone Joint Surg Br. 1987 Jan; 69 (1): 80-83</font></p>    <p><font face="verdana" size="2">6. Lotke PA, Lefkoe RT, Ecker ML. Late results following medial meniscectomy in an older populatio. J Bone Joint Surg Am. 1981 Jan; 63 (1): 115-119</font></p>    <p><font face="verdana" size="2">7. Roos E, Ostenberg A, Roos H. Long-term outcome of meniscectomy: symptoms, function, and performance tests in patients with or without radiographic arthritis compared to matched controls. Osteoarthritis Cartilage. 2001 May; 9 (4): 316-324</font></p>    ]]></body>
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<body><![CDATA[<p><font face="verdana" size="2">78. Zaffagnini S, Marcheggiani Muccioli GM, Lopomo N. Prospective long-term outcomes of the medial collagen meniscus implant versus partial medial meniscectomy: a minimum 10-year follow-up study. Am J Sports Med. 2011 May; 39 (5): 977-985</font></p>    <p><font face="verdana" size="2">79. Monllau JC, Gelber PE, Abat F. Outcome after partial medial meniscus substitution with the collagen meniscal implant at a minimum of 10 years follow-up. Arthroscopy. 2011 Jul; 27 (7): 933-943</font></p>    <p>&nbsp;</p>    <p><b><font face="Verdana" size="2">Conflito de interesse: </font></b></p><font face="verdana" size="2">    <p>Nada a declarar</p></font>    <p>&nbsp;</p><a name="c"></a>    <p><b><font face="Verdana" size="2"><a href="#topc">Endereço para correspondência</a></font></b></p>    <p><font face="Verdana" size="2">Diogo Moura    <br>Serviço de Ortopedia e Traumatologia    <br>Centro Hospitalar e Universitário de Coimbra    ]]></body>
<body><![CDATA[<br>Rua Fonseca Pinto    <br>3000-075 Coimbra    <br>Telefone: 966964175    <br><a href="mailto:dflmoura@gmail.com">dflmoura@gmail.com</a></font></p>    <p>&nbsp;</p>    <p><font face="verdana" size="2"><b>Data de Submissão: </b> 2016-09-23</font></p>    <p><font face="verdana" size="2"><b>Data de Revisão: </b> 2017-01-29</font></p>    <p><font face="verdana" size="2"><b>Data de Aceitação: </b> 2017-02-28</font></p>     ]]></body><back>
<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Petty]]></surname>
<given-names><![CDATA[CA]]></given-names>
</name>
<name>
<surname><![CDATA[Lubowitz]]></surname>
<given-names><![CDATA[JH]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Does arthroscopic partial meniscectomy always cause arthritis?]]></article-title>
<source><![CDATA[Sports Med Arthrosc]]></source>
<year>06/2</year>
<month>01</month>
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