<?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>S1646-21222017000300005</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Menisco discóide: Controvérsias do tratamento]]></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 ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2017</year>
</pub-date>
<volume>25</volume>
<numero>3</numero>
<fpage>193</fpage>
<lpage>203</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S1646-21222017000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S1646-21222017000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S1646-21222017000300005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[O menisco discóide é a denominação para uma variante anatómica anormal dos meniscos dos joelhos, que é frequentemente assintomática. A morfologia e por vezes a instabilidade do menisco discóide são responsáveis pelo seu risco aumentado de roturas e lesões degenerativas, que podem causar sintomas. Uma avaliação clínica adequada combinada com uma ressonância magnética nuclear do joelho são essenciais para um diagnóstico precoce de um menisco discóide sintomático. As opções de tratamento são controversas e variam de acordo com o tipo de menisco discóide, a sua estabilidade e a presença e tipo de roturas meniscais. Os tratamentos atuais incluem meniscectomia parcial, sutura de roturas, estabilização meniscal e meniscoplastia. A maior parte dos artigos demonstram bons e excelentes resultados clínicos e funcionais a curto e médio prazo, no entanto os resultados a longo prazo e o risco de progressão para osteoartrose precoce permanecem desconhecidos. O objetivo deste artigo é realizar uma revisão bibliográfica da patologia do menisco discóide, procurando rever os conhecimentos mais recentes nas várias dimensões desta patologia, nomeadamente em termos de definição, epidemiologia, fisiopatologia, sintomatologia, diagnóstico, opções de tratamento e prognóstico. Para isso foi realizada uma pesquisa na base de dados Pubmed/Medline com as palavras “Discoid Meniscus” e foram seleccionados os artigos originais e de revisão publicados em língua inglesa considerados mais relevantes sobre este tópico.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Discoid meniscus is an abnormal anatomic variant of the knee meniscus that is frequently asymptomatic. Its morphological conformation and sometimes instability are responsible for the increased risk of meniscal tears and degenerative injuries, which may cause symptoms. A proper clinical evaluation combined with a magnetic resonance of the knee are essential to an early diagnosis of a symptomatic discoid meniscus. Treatment options are controversial and vary based on the discoid meniscus type and its stability, the presence and type of meniscal tear. Current treatments include partial meniscectomy, suture of meniscal tears, meniscal stabilization meniscal and meniscoplasty. Most of the papers present good to excellent short and medium term clinical and functional outcomes, however long term results and the progression to early osteoarthritis risk stills unknown. This paper goal is to perform a literature review about discoid meniscus pathology, reviewing current knowledge on all dimensions of this condition, particularly in terms of definition, epidemiology, physiopathology, symptoms, diagnosis, treatment options and prognosis. A research at database Pubmed/Medline using the words “Discoid Meniscus”, was performed and the most relevant english language original and review papers about this topic were selected.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[Menisco discóide]]></kwd>
<kwd lng="pt"><![CDATA[joelho]]></kwd>
<kwd lng="pt"><![CDATA[roturas]]></kwd>
<kwd lng="pt"><![CDATA[tratamento]]></kwd>
<kwd lng="pt"><![CDATA[artroscopia]]></kwd>
<kwd lng="pt"><![CDATA[artrose]]></kwd>
<kwd lng="pt"><![CDATA[preservação meniscal]]></kwd>
<kwd lng="en"><![CDATA[Discoid meniscus]]></kwd>
<kwd lng="en"><![CDATA[knee]]></kwd>
<kwd lng="en"><![CDATA[meniscal tears]]></kwd>
<kwd lng="en"><![CDATA[treatment]]></kwd>
<kwd lng="en"><![CDATA[arthroscopy]]></kwd>
<kwd lng="en"><![CDATA[arthrosis]]></kwd>
<kwd lng="en"><![CDATA[meniscal preservation]]></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">Menisco discóide - Controvérsias do tratamento</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, Centro Hospitalar e Universitário de 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>O menisco disc&oacute;ide &eacute; a denomina&ccedil;&atilde;o para uma variante anat&oacute;mica anormal dos meniscos dos joelhos, que &eacute; frequentemente assintom&aacute;tica. A morfologia e por vezes a instabilidade do menisco disc&oacute;ide s&atilde;o respons&aacute;veis pelo seu risco aumentado de roturas e les&otilde;es degenerativas, que podem causar sintomas. Uma avalia&ccedil;&atilde;o cl&iacute;nica adequada combinada com uma resson&acirc;ncia magn&eacute;tica nuclear do joelho s&atilde;o essenciais para um diagn&oacute;stico precoce de um menisco disc&oacute;ide sintom&aacute;tico. As op&ccedil;&otilde;es de tratamento s&atilde;o controversas e variam de acordo com o tipo de menisco disc&oacute;ide, a sua estabilidade e a presen&ccedil;a e tipo de roturas meniscais. Os tratamentos atuais incluem meniscectomia parcial, sutura de roturas, estabiliza&ccedil;&atilde;o meniscal e meniscoplastia. A maior parte dos artigos demonstram bons e excelentes resultados cl&iacute;nicos e funcionais a curto e m&eacute;dio prazo, no entanto os resultados a longo prazo e o risco de progress&atilde;o para osteoartrose precoce permanecem desconhecidos. O objetivo deste artigo &eacute; realizar uma revis&atilde;o bibliogr&aacute;fica da patologia do menisco disc&oacute;ide, procurando rever os conhecimentos mais recentes nas v&aacute;rias dimens&otilde;es desta patologia, nomeadamente em termos de defini&ccedil;&atilde;o, epidemiologia, fisiopatologia, sintomatologia, diagn&oacute;stico, op&ccedil;&otilde;es de tratamento e progn&oacute;stico. Para isso foi realizada uma pesquisa na base de dados <em>Pubmed/Medline</em> com as palavras <em>&ldquo;Discoid Meniscus&rdquo;</em> e foram seleccionados os artigos originais e de revis&atilde;o publicados em l&iacute;ngua inglesa considerados mais relevantes sobre este t&oacute;pico.</p></font>    <p><font face="verdana" size="2"><b>Palavras chave</b>: Menisco discóide, joelho, roturas, tratamento, artroscopia, artrose, preservação meniscal. </font></p>    <p>&nbsp;</p>    <p><b><font face="Verdana" size="2">ABSTRACT</font></b></p><font face="verdana" size="2">    <p>Discoid meniscus is an abnormal anatomic variant of the knee meniscus that is frequently asymptomatic. Its morphological conformation and sometimes instability are responsible for the increased risk of meniscal tears and degenerative injuries, which may cause symptoms. A proper clinical evaluation combined with a magnetic resonance of the knee are essential to an early diagnosis of a symptomatic discoid meniscus. Treatment options are controversial and vary based on the discoid meniscus type and its stability, the presence and type of meniscal tear. Current treatments include partial meniscectomy, suture of meniscal tears, meniscal stabilization meniscal and meniscoplasty. Most of the papers present good to excellent short and medium term clinical and functional outcomes, however long term results and the progression to early osteoarthritis risk stills unknown. This paper goal is to perform a literature review about discoid meniscus pathology, reviewing current knowledge on all dimensions of this condition, particularly in terms of definition, epidemiology, physiopathology, symptoms, diagnosis, treatment options and prognosis. A research at database Pubmed/Medline using the words &ldquo;Discoid Meniscus&rdquo;, was performed and the most relevant english language original and review papers about this topic were selected.</p></font>    <p><font face="verdana" size="2"><b>Key words</b>: Discoid meniscus, knee, meniscal tears, treatment, arthroscopy, arthrosis, meniscal preservation. </font></p>    <p>&nbsp;</p>    <p><b><font face="Verdana" size="2">INTRODUÇÃO</font></b></p><font face="verdana" size="2"></font>    <p><b><font face="Verdana" size="2">Anatomia e embriologia do menisco discóide</font></b></p><font face="verdana" size="2">    <p>O menisco disc&oacute;ide, descrito pela primeira vez por Young em 1889, &eacute; uma anomalia morfol&oacute;gica cong&eacute;nita dos meniscos dos joelhos, que se caracteriza por uma espessura uniforme aumentada (8 a 10mm) e uma estrutura em disco ou bloco que implica uma maior cobertura da superf&iacute;cie articular tibial pelo menisco<sup>1-4</sup>. A sua preval&ecirc;ncia varia entre 0.4% e 17%, &eacute; mais frequente em asi&aacute;ticos e &eacute; a variante anat&oacute;mica mais frequente dos meniscos dos joelhos<sup>3,5-18</sup>. O menisco disc&oacute;ide sintom&aacute;tico &eacute; a causa mais frequente de cirurgias artrosc&oacute;picas em crian&ccedil;as<sup>19</sup>. A sua origem permanece controversa, no entanto &eacute; atualmente aceite pela maioria dos autores que os meniscos disc&oacute;ides s&atilde;o cong&eacute;nitos e surgem por altera&ccedil;&otilde;es embrion&aacute;rias na condensa&ccedil;&atilde;o do tecido mesenquimatoso que vai dar origem aos meniscos<sup>20,21</sup>. Smillie<sup>9</sup> defendeu que a forma disc&oacute;ide era uma etapa normal do desenvolvimento embrion&aacute;rio do menisco e que a aus&ecirc;ncia de absor&ccedil;&atilde;o da sua por&ccedil;&atilde;o central daria origem aos meniscos disc&oacute;ides, no entanto esta teoria foi abandonada devido &agrave; demonstra&ccedil;&atilde;o de que a morfologia disc&oacute;ide n&atilde;o faz parte do desenvolvimento embrion&aacute;rio meniscal normal. Por sua vez, Kaplan<sup>22</sup> prop&ocirc;s que a anatomia disc&oacute;ide poderia ser uma adapta&ccedil;&atilde;o morfol&oacute;gica durante o desenvolvimento a um menisco inst&aacute;vel anormal por inser&ccedil;&otilde;es perif&eacute;ricas insuficientes. Este menisco inst&aacute;vel sofreria movimentos de excurs&atilde;o excessivos e consequentes microtraumas anormais repetidos, que conduziriam &agrave; aquisi&ccedil;&atilde;o da forma disc&oacute;ide.&nbsp; No entanto, esta teoria n&atilde;o permite explicar o facto da maioria dos meniscos disc&oacute;ides apresentarem uma inser&ccedil;&atilde;o posterior normal, pelo que foi abandonada. O menisco lateral disc&oacute;ide &eacute; mais frequente que o menisco medial disc&oacute;ide e em 10% dos casos s&atilde;o bilaterais. A presen&ccedil;a de menisco lateral e medial disc&oacute;ides no mesmo joelho &eacute; muito rara<sup>2,3</sup>. Watanabe M et al.<sup>23</sup> classificaram os meniscos disc&oacute;ides de acordo com o grau de cobertura do planalto tibial e a sua estabilidade, em 3 tipos: completo (cobre toda extens&atilde;o do planalto tibial), incompleto (cobre menos de 80% do planalto tibial) e tipo Wrisberg ou inst&aacute;vel, apresentando este &uacute;ltimo aus&ecirc;ncia das inser&ccedil;&otilde;es menisco-capsulares e menisco-tibiais posteriores (&eacute; apenas estabilizado posterior pelo ligamento menisco-femoral posterior de Wrisberg), sendo portanto hiperm&oacute;vel e inst&aacute;vel (<a name="topf1"></a><a href="#f1">Figura 1</a>)<sup>4,23</sup>.</p>    ]]></body>
<body><![CDATA[<p>&nbsp;</p><a name="f1"></a>     <p>    <center><img src="/img/revistas/rpot/v25n3/25n3a05f1.jpg" width="392" height="217" border="0" /></center></p>    
<p>&nbsp;</p></font>    <p>&nbsp;</p>    <p><b><font face="Verdana" size="2">CLÍNICA E DIAGNÓSTICO DO MENISCO DISCÓIDE SINTOMÁTICO</font></b></p><font face="verdana" size="2">    <p>Apesar dos meniscos disc&oacute;ides serem frequentemente assintom&aacute;ticos e muitas vezes serem encontrados como um achado numa artroscopia, estes podem tornar-se sintom&aacute;ticos em crian&ccedil;as e adolescentes por instabilidade ou podem mais frequentemente em qualquer idade sofrer roturas e provocar sintomas<sup>3-6,24-27</sup>. Devido &agrave; sua estrutura disc&oacute;ide e consequente maior cobertura do prato tibial, &agrave; sua espessura elevada, &agrave; mobilidade anormal e &agrave; instabilidade (esta &uacute;ltima verificada no tipo Wrisberg), os meniscos disc&oacute;ides est&atilde;o mais expostos ao mecanismo de pin&ccedil;amento entre f&eacute;mur e t&iacute;bia. Estes fatores biomec&acirc;nicos associados &agrave; pobre vasculariza&ccedil;&atilde;o dos meniscos disc&oacute;ides e ao menor n&uacute;mero e desorganiza&ccedil;&atilde;o das suas fibras de colag&eacute;nio, tendo menor resist&ecirc;ncia a cargas por n&atilde;o apresentar a t&iacute;pica disposi&ccedil;&atilde;o circunferencial do menisco normal, fazem com que tenham um risco superior de sofrer roturas e altera&ccedil;&otilde;es degenerativas e portanto de se tornarem sintom&aacute;ticos, em compara&ccedil;&atilde;o com meniscos anatomicamente normais<sup>2-4,12-14,25,28-34</sup>.</p>
    <p>Os sintomas muito vari&aacute;veis, vagos e intermitentes por vezes associados ao menisco disc&oacute;ide tornam o seu diagn&oacute;stico dif&iacute;cil e podem atras&aacute;-lo. O sintoma mais frequente &eacute; a dor, que pode ser acompanhada de epis&oacute;dios de bloqueio do joelho, de um ressalto aud&iacute;vel (<em>snapping knee</em>), de derrames intra-articulares, entre outros<sup>3,10,17,35-37</sup>. No entanto, o recurso &agrave; resson&acirc;ncia magn&eacute;tica nuclear, o atual exame complementar de diagn&oacute;stico <em>gold-standard</em> para diagn&oacute;stico de les&otilde;es meniscais, tem contribuido para o aumento da efic&aacute;cia na sua dete&ccedil;&atilde;o<sup>38-40</sup>. Os crit&eacute;rios de diagn&oacute;stico de menisco disc&oacute;ide completo na resson&acirc;ncia s&atilde;o: di&acirc;metro meniscal transverso superior a 20mm ou a 20% da largura do prato tibial nas incid&ecirc;ncias coronais; continuidade entre os cornos meniscais anterior e posterior (sinal do la&ccedil;o) vis&iacute;vel em pelo menos tr&ecirc;s cortes sagitais de 5mm consecutivos<sup>38</sup>. Os meniscos disc&oacute;ides incompletos e os inst&aacute;veis de Wrisberg t&ecirc;m frequentemente uma apar&ecirc;ncia normal na resson&acirc;ncia, no entanto nestes &uacute;ltimos por vezes &eacute; vis&iacute;vel uma subtil subluxa&ccedil;&atilde;o anterior do corpo posterior meniscal<sup>41,42</sup>. Apesar de ter sensibilidade reduzida, a altera&ccedil;&atilde;o mais frequente na radiografia simples do joelho &eacute; o alargamento do espa&ccedil;o articular f&eacute;moro-tibial do lado onde se encontra o menisco disc&oacute;ide<sup>3</sup>.</p>
    <p>Os tipos de roturas mais frequentes do menisco disc&oacute;ide completo s&atilde;o as perif&eacute;ricas longitudinais e as horizontais, sendo comuns roturas intra-subst&acirc;ncia<sup>2,4,6,9,12,25,28,39,32,40,43-45</sup>. A espessura e &aacute;rea meniscais mais elevadas fazem com que os meniscos disc&oacute;ides fiquem sujeitos a for&ccedil;as de cisalhamento excessivas durante a transla&ccedil;&atilde;o do c&ocirc;ndilo femoral sobre a t&iacute;bia, provocando tipicamente roturas intra-subst&acirc;ncia de delamina&ccedil;&atilde;o que separam o menisco em dois folhetos<sup>3-4</sup>. Este tipo de roturas real&ccedil;am o interesse da resson&acirc;ncia magn&eacute;tica no diagn&oacute;stico, na medida em que s&atilde;o particularmente dif&iacute;ceis de diagnosticar na artroscopia, por muitas vezes ambas as superf&iacute;cies meniscais femoral e tibial se apresentarem sem qualquer evid&ecirc;ncia de rotura, apenas demonstrando um amolecimento excessivo ou uma ligeira irregularidade sagital na superf&iacute;cie meniscal<sup>2,3,39,46</sup>. No menisco disc&oacute;ide incompleto, mais pr&oacute;ximo da estrutura meniscal normal, as&nbsp; roturas mais frequentes s&atilde;o as radi&aacute;rias<sup>2,28</sup>.</p></font>    <p>&nbsp;</p>    ]]></body>
<body><![CDATA[<p><b><font face="Verdana" size="2">TRATAMENTO DO MENISCO DISCÓIDE SINTOMÁTICO</font></b></p><font face="verdana" size="2">    <p>No passado, ap&oacute;s tratamento conservador do menisco disc&oacute;ide sintom&aacute;tico sem sucesso, optava-se pela resse&ccedil;&atilde;o meniscal aberta, procedimento que hoje em dia est&aacute; abandonado. A artroscopia veio revolucionar o tratamento cir&uacute;rgico do menisco disc&oacute;ide sintom&aacute;tico, no entanto atualmente todas as t&eacute;cnicas para o seu tratamento permanecem controversas e com resultados contradit&oacute;rios na literatura cient&iacute;fica<sup>6,25,28,43,45,47</sup>. A meniscectomia total est&aacute; atualmente abandonada devido &agrave; associa&ccedil;&atilde;o da aus&ecirc;ncia de menisco com r&aacute;pida progress&atilde;o para gonartrose tanto em crian&ccedil;as como em adultos<sup>48,49</sup>. 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. A congru&ecirc;ncia necess&aacute;ria para o funcionamento articular &eacute; garantida atrav&eacute;s do aumento da profundidade das superf&iacute;cies tibiais pelos meniscos, que permitem assim um encaixe mais eficaz destas com os c&ocirc;ndilos femorais. A forma semilunar e em cunha dos meniscos normais adaptada &agrave; morfologia femoral permite que os v&eacute;rtices dos c&ocirc;ndilos femorais estejam sempre no centro meniscal, assegurando a congru&ecirc;ncia articular. Sendo assim, faz sentido que a aus&ecirc;ncia de menisco diminua a congru&ecirc;ncia f&eacute;moro-tibial, em particular no compartimento lateral, no qual passa a haver contacto direto entre superf&iacute;cies articulares femoral convexa e tibial tamb&eacute;m convexa. A reduzida congru&ecirc;ncia e a aus&ecirc;ncia de uma estrutura de amortecimento de choques e de uniformiza&ccedil;&atilde;o da distribui&ccedil;&atilde;o de cargas conduzem a que diminuia a &aacute;rea de contacto e se verifiquem cargas excessivas sobre a cartilagem articular (aumento da press&atilde;o de contacto), o que favorece a sua les&atilde;o e o desenvolvimento de osteoartrose<sup>28,50</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 precoce em 86 a 100% dos casos<sup>2,6,11,48,49,51-55</sup>. Alguns autores referem que a presen&ccedil;a de um menisco disc&oacute;ide confere uma prote&ccedil;&atilde;o adicional contra altera&ccedil;&otilde;es degenerativas osteoartr&oacute;sicas, possivelmente por permitir um amortecimento e distribui&ccedil;&atilde;o de cargas mais eficientes, protegendo assim a cartilagem articular<sup>2,25,44</sup>.</p>
    <p>Atualmente o tratamento cir&uacute;rgico do menisco disc&oacute;ide apenas est&aacute; indicado se este for sintom&aacute;tico<sup>2,4,25,28,33,35,37,44</sup>. O tratamento <em>gold-standard</em> para as roturas meniscais centrais e horizontais traum&aacute;ticas agudas, 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, num menisco disc&oacute;ide est&aacute;vel &eacute; a meniscectomia parcial (<a name="topf2"></a><a href="#f2">Figura 2</a>). Se forem identificadas roturas perif&eacute;ricas, estas poder&atilde;o ser pass&iacute;veis de repara&ccedil;&atilde;o meniscal, de acordo com a localiza&ccedil;&atilde;o da rotura atrav&eacute;s de t&eacute;cnicas de sutura <em>inside-out</em> (corno posterior e corpo meniscal), <em>outside-in</em> (corno anterior e corpo meniscal), ou <em>all-inside</em> (corno posterior e corpo meniscal), cuja superioridade de cada uma em rela&ccedil;&atilde;o &agrave;s outras ainda n&atilde;o foi demonstrada. Perante um menisco disc&oacute;ide hiperm&oacute;vel inst&aacute;vel (tipo Wrisberg) sintom&aacute;tico est&aacute; indicada a sua estabiliza&ccedil;&atilde;o com fixa&ccedil;&atilde;o &oacute;ssea tibial de modo a manter o menisco no local mais prop&iacute;cio &agrave; sua fun&ccedil;&atilde;o adequada de absor&ccedil;&atilde;o de choques e prote&ccedil;&atilde;o da cartilagem articular. As t&eacute;cnicas artrosc&oacute;picas de estabiliza&ccedil;&atilde;o meniscal posterior s&atilde;o recentes e consistem na sutura com &acirc;ncoras e no <em>pullout</em> transtibial, contudo a evid&ecirc;ncia acerca dos seus resultados e de uma t&eacute;cnica em compara&ccedil;&atilde;o com a outra permanece limitada. Por sua vez, perante um remanescente meniscal inst&aacute;vel ap&oacute;s meniscectomia parcial est&aacute; indicada a sua estabiliza&ccedil;&atilde;o com sutura &agrave; c&aacute;psula articular<sup>4,6,17,28,32,33,35,44,48,56-64</sup>. A preserva&ccedil;&atilde;o ao m&aacute;ximo de tecido meniscal funcional e est&aacute;vel deve ser um das principais preocupa&ccedil;&otilde;es no tratamento cir&uacute;rgico, na medida em que est&aacute; demonstrado que o risco de progress&atilde;o para osteoartrose est&aacute; associado &agrave; quantidade de menisco ressecado ap&oacute;s uma meniscectomia<sup>4,28,32,33,35,48,65,66</sup>. O objetivo da meniscectomia parcial &eacute; portanto remover a regi&atilde;o inst&aacute;vel da rotura central, excisando o m&iacute;nimo poss&iacute;vel necess&aacute;rio para o tratamento adequado da rotura. Deve-se procurar preservar o m&aacute;ximo poss&iacute;vel de tecido meniscal perif&eacute;rico est&aacute;vel ou pelo menos uma quantidade adequada (segundo alguns autores m&iacute;nimo de 6-8mm de largura) que permita manter a fun&ccedil;&atilde;o meniscal de amortecedor de choques, de uniformiza&ccedil;&atilde;o de cargas pela superf&iacute;cie articular e de aumento da congru&ecirc;ncia articular f&eacute;moro-tibial<sup>2,4,25,28,64,65,67</sup>. O grau de dificuldade da meniscectomia parcial num menisco disc&oacute;ide pode ser mais elevado devido &agrave; maior espessura e &agrave; ocupa&ccedil;&atilde;o de espa&ccedil;o pelo menisco de maiores dimens&otilde;es, em particular pelo menisco disc&oacute;ide completo, deixando pouco espa&ccedil;o para os instrumentos cir&uacute;rgicos artrosc&oacute;picos, o que aumenta o risco de les&atilde;o condral iatrog&eacute;nica<sup>6,56-58,68,69</sup>. Est&atilde;o descritas v&aacute;rias t&eacute;cnicas de meniscectomia parcial do menisco disc&oacute;ide, entre as quais, a excis&atilde;o aberta, a excis&atilde;o artrosc&oacute;pica de pequenos fragmentos (<em>piecemeal arthroscopic excision</em>), a excis&atilde;o artrosc&oacute;pica de grandes fragmentos (<em>morcellation excision</em>), a excis&atilde;o semi-artrosc&oacute;pica e a excis&atilde;o artrosc&oacute;pica em bloco<sup>6,33,68,70</sup>.</p>    <p>&nbsp;</p><a name="f2"></a>     <p>    <center><img src="/img/revistas/rpot/v25n3/25n3a05f2.jpg" width="391" height="194" border="0" /></center></p>    
<p>&nbsp;</p>
    <p>Nas roturas perif&eacute;ricas e particularmente em crian&ccedil;as, devido &agrave; sua maior vasculariza&ccedil;&atilde;o meniscal e consequentemente elevado potencial de cicatriza&ccedil;&atilde;o, sempre que poss&iacute;vel e indicado (em roturas verticais longitudinais), deve-se optar pela sutura meniscal em vez de proceder &agrave; meniscectomia parcial<sup>4</sup>. No entanto, em roturas perif&eacute;ricas extensas e sem condi&ccedil;&otilde;es de sutura, a meniscectomia parcial pode ser inevit&aacute;vel, devendo-se da mesma maneira preservar o m&aacute;ximo de menisco perif&eacute;rico poss&iacute;vel, evitando assim a meniscectomia subtotal ou total<sup>4,65</sup>. A t&eacute;cnica de transplante meniscal poder&aacute; ser uma op&ccedil;&atilde;o ap&oacute;s meniscectomia total em menisco disc&oacute;ide com rotura complexa e inst&aacute;vel, no entanto os estudos dispon&iacute;veis s&atilde;o ainda insuficientes para a afirmar como m&eacute;todo de tratamento eficaz<sup>71</sup>.</p>
    <p>Atualmente v&aacute;rios autores defendem que nenhum grau de meniscectomia &eacute; in&oacute;cuo quanto ao risco aumentado de progress&atilde;o para osteoartrose<sup>2,28,30,72</sup>. Como tal, faz sentido que a meniscoplastia do menisco disc&oacute;ide, isto &eacute;, a resse&ccedil;&atilde;o da sua por&ccedil;&atilde;o central, deixando apenas a sua por&ccedil;&atilde;o perif&eacute;rica intacta de modo a tentar transformar um menisco disc&oacute;ide num menisco com a morfologia semilunar normal, deva ser evitada se tal grau de excis&atilde;o meniscal n&atilde;o for necess&aacute;rio para o tratamento da rotura<sup>2,72</sup>. O objetivo deve ser preservar o mais poss&iacute;vel da anatomia original do menisco disc&oacute;ide, para o qual toda a estrutura m&uacute;sculo-ligamentar do joelho se adaptou. A altera&ccedil;&atilde;o da morfologia meniscal causada pela meniscoplastia poder&aacute; desequilibrar o joelho, favorecer cargas assim&eacute;tricas anormais e conduzir ao desenvolvimento de osteoartrose precoce<sup>2,4,37</sup>. Apesar disto, alguns autores praticam e afirmam resultados satisfat&oacute;rios com a meniscoplastia artrosc&oacute;pica sempre que existe um menisco disc&oacute;ide sintom&aacute;tico, contudo a evid&ecirc;ncia cient&iacute;fica sobre os seus resultados a longo prazo &eacute; limitada<sup>45,73</sup>. Lee DH et al.<sup>45</sup> afirmam que determinados estudos que relatam uma percentagem elevada de sinais radiogr&aacute;ficos de osteoartrose ap&oacute;s meniscectomia de menisco disc&oacute;ide poder&atilde;o estar enviesados na medida em que n&atilde;o avaliaram o grau de osteoartrose previamente &agrave; cirurgia meniscal, podendo esses sinais j&aacute; estarem presentes antes da meniscectomia. Os mesmos autores verificaram no seu estudo em 43 joelhos de crian&ccedil;as com menisco disc&oacute;ide lateral sintom&aacute;tico, que no momento da meniscectomia 46.5% destes apresentavam condromal&aacute;cia grau I ou II ao n&iacute;vel do c&ocirc;ndilo femoral lateral de acordo com a classifica&ccedil;&atilde;o de Outerbridge e que 67.4% apresentavam condromal&aacute;cia graus I, II ou III do prato tibial lateral. O estudo afirma que a presen&ccedil;a de les&otilde;es condrais pr&eacute;vias &eacute; um fator essencial que se correlaciona positivamente com a progress&atilde;o para osteoartrose precoce ap&oacute;s meniscectomia parcial, subtotal ou total<sup>45</sup>.</p>
    <p>V&aacute;rios artigos apresentam os resultados clinico-funcionais do tratamento cir&uacute;rgico de meniscos disc&oacute;ides a curto e m&eacute;dio prazo, no entanto poucos o fazem com tempo de seguimento superior a 10 anos<sup>66</sup>. Chedal-Bornu B et al<sup>73</sup>. estudaram retrospetivamente 14 joelhos com roturas sintom&aacute;ticas de meniscos disc&oacute;ides laterais em 10 pacientes com idade m&eacute;dia de 31.4 anos e tempo m&eacute;dio de seguimento de 13.1 anos. O tratamento de todos os casos foi meniscectomia parcial artrosc&oacute;pica. Os resultados cl&iacute;nico-funcionais a longo prazo foram excelentes, no entanto verificaram-se sinais radiogr&aacute;ficos de osteoartrose do compartimento lateral em 58% dos casos. Apesar destes resultados ap&oacute;s meniscectomia parcial, os autores referem que esta percentagem de evolu&ccedil;&atilde;o para osteoartrose precoce &eacute; semelhante &agrave; encontrada ap&oacute;s meniscectomia parcial do menisco lateral com anatomia normal (n&atilde;o disc&oacute;ide), como o comprova o estudo de Hulet et al.<sup>72</sup>, que identificou 53% de casos de evolu&ccedil;&atilde;o para osteoartrose ap&oacute;s 22 anos de tempo m&eacute;dio de seguimento. Por sua vez, Ahn JH et al.<sup>65</sup> estudaram retrospetivamente 48 joelhos de 38 crian&ccedil;as (idade m&eacute;dia 9.9, intervalo 4-15 anos) submetidos a meniscectomia artrosc&oacute;pica por menisco disc&oacute;ide lateral sintom&aacute;tico e com tempo m&eacute;dio de seguimento de 10.1 anos. 22 foram submetidos a meniscectomia parcial, 18 a meniscectomia parcial com sutura perif&eacute;rica associada e 8 a meniscectomia subtotal. Os autores verificaram que 94% dos casos apresentaram bons e excelentes resultados cl&iacute;nico-funcionais. Apesar disto, a n&iacute;vel radiogr&aacute;fico foram identificadas altera&ccedil;&otilde;es osteodegenerativas progressivas em 40% dos pacientes, nomeadamente desenvolvimento de pequenos oste&oacute;fitos no compartimento lateral em 18 joelhos e estreitamento moderado da interlinha articular em apenas um joelho. O grupo submetido a meniscectomia subtotal apresentou &iacute;ndices significativamente superiores de presen&ccedil;a de altera&ccedil;&otilde;es artr&oacute;sicas (88%) em compara&ccedil;&atilde;o com a meniscectomia parcial (23% e 39% nos outros grupos). Aglietti P et al.<sup>47</sup>, num estudo em 17 joelhos de 17 adolescentes (idade m&eacute;dia 13.6, intervalo 5-18 anos) submetidos a tratamento artrosc&oacute;pico por menisco disc&oacute;ide lateral sintom&aacute;tico e com tempo m&eacute;dio de seguimento de 10 anos, verificaram tamb&eacute;m bons e excelentes resultados cl&iacute;nicos em 94% da amostra. O tratamento consistiu em meniscectomia parcial em 11 joelhos e meniscectomia total nos restantes. A avalia&ccedil;&atilde;o radiogr&aacute;fica identificou desenvolvimento de oste&oacute;fitos no compartimento lateral em 53% e estreitamento da interlinha lateral em 73% dos joelhos. Os autores n&atilde;o identificaram qualquer correla&ccedil;&atilde;o dos sinais de osteoartrose com o tipo de menisco disc&oacute;ide e o tipo de meniscectomia efetuado. Por sua vez, Kim SJ et al.<sup>28</sup> estudaram retrospetivamente 121 pacientes (idade m&eacute;dia 26.1 e intervalo 15-40 anos) com 125 joelhos com meniscos disc&oacute;ides laterais (74 completos e 51 incompletos) submetidos a meniscectomia total ou parcial de acordo com o tipo de rotura e estabilidade meniscal. Nos meniscos disc&oacute;ides completos com menos de 5 anos de seguimento, as meniscectomias totais apresentaram melhores resultados cl&iacute;nicos que as meniscectomias parciais e n&atilde;o se verificaram diferen&ccedil;as quanto aos sinais radiogr&aacute;ficos de gonartrose. No entanto, ap&oacute;s 5 anos os resultados cl&iacute;nicos nestes dois grupos n&atilde;o apresentavam diferen&ccedil;as, enquanto se verificaram significativamente mais sinais osteoartr&oacute;sicos no grupo da meniscectomia total em compara&ccedil;&atilde;o com a parcial. Nos meniscos disc&oacute;ides incompletos a meniscectomia parcial demonstrou melhores resultados cl&iacute;nicos independentemente do tempo de seguimento, enquanto em termos de sinais radiogr&aacute;ficos de gonartrose o grupo da meniscectomia parcial apenas foi superior ao da meniscectomia total ap&oacute;s 5 anos de seguimento. Os autores concluiram que o progn&oacute;stico a longo prazo ap&oacute;s uma meniscectomia artrosc&oacute;pica est&aacute; relacionado com o volume de menisco ressecado. Outro estudo retrospetivo por Lee DH et al.<sup>45</sup> analisaram 36 crian&ccedil;as (idade m&eacute;dia 9.5 e intervalo 5-14 anos) com 43 meniscos disc&oacute;ides laterais sintom&aacute;ticos em crian&ccedil;as (idade m&eacute;dia 9.5 anos, intervalo 5-14 anos) submetidos a meniscectomia parcial (n=23) e meniscectomia subtotal ou total (n=20) ao longo de tempo m&eacute;dio de 4.3 anos. Os autores verificaram que 83.7% da amostra apresentaram bons e excelentes resultados cl&iacute;nicos, sem diferen&ccedil;a entre os tipos de meniscectomia efetuados. Apesar disto, foram identificados &iacute;ndices de desgaste do prato tibial lateral significativamente superiores no grupo da meniscectomia total e subtotal em compara&ccedil;&atilde;o com o grupo da meniscectomia parcial. Foi tamb&eacute;m encontrada uma correla&ccedil;&atilde;o positiva entre a dura&ccedil;&atilde;o dos sintomas do menisco disc&oacute;ide e a presen&ccedil;a de les&otilde;es condrais no prato tibial lateral no momento da cirurgia ao menisco. Os autores recomendam que o diagn&oacute;stico e tratamento cir&uacute;rgico da rotura meniscal devem ser efetuados o mais precocemente poss&iacute;vel, n&atilde;o s&oacute; para evitar les&otilde;es condrais e minimizar o risco de progress&atilde;o para osteoartrose, mas tamb&eacute;m para prevenir o agravamento da extens&atilde;o da rotura meniscal que poder&aacute; exigir &agrave; partida uma meniscectomia total. Por &uacute;ltimo, Okazaki K et al.<sup>66</sup> verificaram retrospetivamente com 16 anos de tempo m&eacute;dio de recuo que os resultados cl&iacute;nicos da meniscectomia subtotal artrosc&oacute;pica em meniscos disc&oacute;ides eram superiores em pacientes com idade inferior a 25 anos. Os autores justificaram estes dados por maior capacidade dos pacientes mais novos em se adaptarem &agrave;s cargas excessivas sobre a cartilagem e ao desenvolvimento de osteoartrose precoce ocorrer mais frequentemente em pacientes com idade mais avan&ccedil;ada.</p></font>    ]]></body>
<body><![CDATA[<p>&nbsp;</p>    <p><b><font face="Verdana" size="2">CONCLUSÃO</font></b></p><font face="verdana" size="2">    <p>O menisco disc&oacute;ide sintom&aacute;tico tem indica&ccedil;&atilde;o cir&uacute;rgica artrosc&oacute;pica e, apesar da sintomatologia ser muitas vezes vari&aacute;vel, vaga e intermitente, o ortopedista deve estar atento e realizar o diagn&oacute;stico o mais precocemente poss&iacute;vel recorrendo ao exame cl&iacute;nico e a uma resson&acirc;ncia magn&eacute;tica. O diagn&oacute;stico precoce diminui as probabilidades de agravamento da rotura meniscal e de se desenvolverem les&otilde;es condrais, diminuido assim o risco de evolu&ccedil;&atilde;o r&aacute;pida para osteoartrose precoce. Atualmente existe evid&ecirc;ncia cient&iacute;fica que o risco de progress&atilde;o para osteoartrose ap&oacute;s meniscectomia parcial depende da quantidade de menisco funcional que &eacute; preservado. Como tal, o objetivo do tratamento artrosc&oacute;pico da rotura no menisco disc&oacute;ide deve ser de regularizar o rebordo meniscal inst&aacute;vel ou reparar a rotura ou instabilidade, procurando preservar ao m&aacute;ximo a morfologia do menisco disc&oacute;ide original. Contudo, a evid&ecirc;ncia cient&iacute;fica atual sobre o tratamento cir&uacute;rgico ideal para o menisco disc&oacute;ide sintom&aacute;tico permanece insuficiente, havendo resultados contradit&oacute;rios na literatura. Os resultados cl&iacute;nico-funcionais da meniscectomia artrosc&oacute;pica parcial ou subtotal do menisco disc&oacute;ide sintom&aacute;tico a curto e m&eacute;dio prazo s&atilde;o considerados bons e excelentes, no entanto os resultados radiogr&aacute;ficos em termos de progress&atilde;o para osteoartrose precoce a longo prazo (tempo superior a 10 anos) n&atilde;o s&atilde;o satisfat&oacute;rios. 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 o desenvolvimento de gonartrose precoce a longo prazo.</p></font>    <p>&nbsp;</p>    <p><b><font face="Verdana" size="2">REFERÊNCIAS BIBLIOGRÁFICAS</font></b></p>    <p><font face="verdana" size="2">1. Young RB. The external semilunar cartilage as a complete disc. In Williams and Nortage, editors. Memoirs and memoranda in anatomy. London; 1889. </font></p>    <p><font face="verdana" size="2">2. Atay OA, Doral MN, Leblebicioglu G, Tetik O, Aydingöz U. Management of discoid lateral meniscus tears: observations in 34 knees. Arthroscopy. 2003 Apr; 19 (4): 346-352</font></p>    <p><font face="verdana" size="2">3. Rao SK, ripathi Rao  P. Clinical, radiologic and arthroscopic assessment and treatment of bilateral discoid lateral meniscus. 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<body><![CDATA[<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    <br>Rua Fonseca Pinto    <br>3000-075 Coimbra    <br>Telefone:     ]]></body>
<body><![CDATA[<br>email: <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> 2016-09-19</font></p>    <p><font face="verdana" size="2"><b>Data de Revisão: </b> 2017-01-31</font></p>    <p><font face="verdana" size="2"><b>Data de Aceitação: </b> 2017-08-07</font></p>     ]]></body><back>
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