<?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>2306-4102</journal-id>
<journal-title><![CDATA[Acta ortopédica mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Acta ortop. mex]]></abbrev-journal-title>
<issn>2306-4102</issn>
<publisher>
<publisher-name><![CDATA[Colegio Mexicano de Ortopedia y Traumatología A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2306-41022025000500326</article-id>
<article-id pub-id-type="doi">10.35366/121082</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Tumor tenosinovial de células gigantes localizado en la rodilla. Reporte de caso]]></article-title>
<article-title xml:lang="en"><![CDATA[Localized tenosynovial giant cell tumor of the knee. Case report]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velázquez-Castañeda]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fraind-Maya]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Arce]]></surname>
<given-names><![CDATA[RJ]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lassard-Rosenthal]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Linage]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zimbrón-López]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Hospital Ángeles Lomas Servicio de Traumatología y Ortopedia ]]></institution>
<addr-line><![CDATA[Huixquilucan de Degollado Estado de México]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2025</year>
</pub-date>
<volume>39</volume>
<numero>5</numero>
<fpage>326</fpage>
<lpage>330</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2306-41022025000500326&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2306-41022025000500326&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2306-41022025000500326&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Introducción:  el tumor tenosinovial de células gigantes (TGCT) es una neoplasia benigna poco frecuente que afecta la sinovia articular, bursas y vainas tendinosas. Se clasifica en formas localizadas y difusas. Las formas localizadas afectan principalmente dedos (85%), mientras que las difusas comprometen grandes articulaciones, como la rodilla. Las formas difusas son más agresivas y, excepcionalmente, malignas.  Caso clínico:  paciente masculino de 27 años con dos años de bloqueo y limitación de la rodilla izquierda, agravados tras traumatismo deportivo. La resonancia magnética (RM) mostró lesiones nodulares hiperintensas en la cápsula posterior. La artroscopía reveló una masa adherida a la cápsula posterior, que se resecó completamente y se diagnosticó como TGCT localizado. El paciente egresó a domicilio sin complicaciones tras 24 horas después de la operación y a los seis meses la RM no mostró hallazgos relevantes. Actualmente, tiene arcos de movimiento completos y realiza actividades físicas sin limitaciones.  Conclusiones:  el diagnóstico de TGCT es complejo por su presentación variable. La RM es clave para el diagnóstico y la planificación quirúrgica. Las formas localizadas se manejan con resección artroscópica, con bajas tasas de recurrencia (0-10%) y excelentes resultados. Las formas difusas pueden requerir radioterapia adyuvante o tratamientos farmacológicos en casos refractarios.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Introduction:  tenosynovial giant cell tumor (TGCT) is a rare benign neoplastic condition affecting joint synovia, bursae, and tendon sheaths. It is classified as localized or diffuse based on clinical and biological behavior. Localized forms often affect small joints like fingers (85%), while diffuse forms primarily involve large joints, particularly the knee. Diffuse forms are more aggressive and can exceptionally exhibit malignancy.  Case report:  a 27-year-old male presented with a 2-year history of intermittent knee locking and reduced mobility, worsening after a sports-related trauma. MRI showed hyperintense nodular lesions in the posterior capsule of the knee. Arthroscopy confirmed a mass adherent to the posterior capsule, which was excised and pathologically diagnosed as localized TGCT. The patient was discharged home without complications 24 hours&#8217; post-surgery, and a 6-month follow-up MRI showed no significant findings. Currently, the patient has full range of motion and no limitations in physical activity.  Conclusions:  TGCT diagnosis can be challenging due to variable presentation and nonspecific symptoms, often mimicking meniscal tears. MRI is crucial for diagnosis and surgical planning. Localized forms are managed with arthroscopic excision, yielding low recurrence rates (0-10%) and excellent outcomes. Diffuse forms may require adjuvant radiotherapy or pharmacological treatments in refractory cases.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[tumor tenosinovial]]></kwd>
<kwd lng="es"><![CDATA[tumor de célular gigantes]]></kwd>
<kwd lng="es"><![CDATA[rodilla]]></kwd>
<kwd lng="es"><![CDATA[artroscopía]]></kwd>
<kwd lng="en"><![CDATA[tenosynovial tumor]]></kwd>
<kwd lng="en"><![CDATA[giant cell tumor]]></kwd>
<kwd lng="en"><![CDATA[knee]]></kwd>
<kwd lng="en"><![CDATA[arthroscopy]]></kwd>
</kwd-group>
</article-meta>
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