<?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>2992-7749</journal-id>
<journal-title><![CDATA[Cirugía de columna (México, Ciudad de México)]]></journal-title>
<abbrev-journal-title><![CDATA[Cir. Columna]]></abbrev-journal-title>
<issn>2992-7749</issn>
<publisher>
<publisher-name><![CDATA[Asociación Mexicana de Cirujanos de Columna A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2992-77492025000400260</article-id>
<article-id pub-id-type="doi">10.35366/120970</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Fenómeno Adding-on en pacientes con escoliosis idiopática del adolescente tratados quirúrgicamente en un hospital de ortopedia de referencia]]></article-title>
<article-title xml:lang="en"><![CDATA[Adding-on phenomenon in patients with adolescent idiopathic scoliosis treated surgically in a reference orthopedic hospital]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Navarro]]></surname>
<given-names><![CDATA[José Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quiroz-Williams]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojero-Gil]]></surname>
<given-names><![CDATA[Elías Kaleb]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gaytán-Fernández]]></surname>
<given-names><![CDATA[Suemmy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romero-Méndez]]></surname>
<given-names><![CDATA[Rubén]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Asención]]></surname>
<given-names><![CDATA[José Pedro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barragán-Hervella]]></surname>
<given-names><![CDATA[Rodolfo Gregorio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-Armenta]]></surname>
<given-names><![CDATA[Gabriel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Mexicano del Seguro Social Unidad Médica de Alta Especialidad Hospital de Traumatología y Ortopedia &#8220;Manuel Ávila Camacho&#8221; ]]></institution>
<addr-line><![CDATA[Puebla ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto de Servicios y Seguridad Social para Trabajadores al Servicio de los Poderes del Estado de Puebla Hospital de Especialidades &#8220;5 de mayo&#8221; ]]></institution>
<addr-line><![CDATA[Puebla ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Popular Autónoma del Estado de Puebla Facultad de Medicina ]]></institution>
<addr-line><![CDATA[Puebla ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2025</year>
</pub-date>
<volume>3</volume>
<numero>4</numero>
<fpage>260</fpage>
<lpage>266</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2992-77492025000400260&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2992-77492025000400260&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2992-77492025000400260&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Introducción:  la escoliosis idiopática del adolescente (EIA) es la más común de todas las escoliosis. Los pacientes con EIA progresivas requieren tratamiento quirúrgico, pero existe un porcentaje que presentan progresión de la deformidad por debajo de la zona de cirugía, fenómeno que se conoce como Adding-on.  Objetivo:  describir el fenómeno Adding-on en pacientes con EIA tratados quirúrgicamente.  Material y métodos:  se realizó una serie de casos de pacientes con EIA, con edades de 12-17 años y sometidos a tratamiento quirúrgico. A todos se les midió ángulo de Cobb, VDI (vértebra distal instrumentada), VPI (vértebra proximal instrumentada), VN (vértebra neutra), VE (vértebra estable) y ápex, así como angulación de la vértebra distal instrumentada (AVDI) y angulación del disco de la vértebra distal instrumentada (DVDI) en las radiografías prequirúrgicas, al mes, seis, 12 y 18 meses. Para el análisis estadístico se establecieron medias y desviación estándar.  Resultados:  muestra 11 pacientes. Edad: 14.0 ± 1.5 años. Lenke 1: 63.6%. VN, VE, ápex, VDI y VPI más frecuentes fueron: L3 (27.3%), L5 (63.6%), T8 (45.5%), L2 (34.6%) y T4 (45.5%) respectivamente. A los 18 meses, al comparar Lenke 1 versus 2, ángulo de Cobb: TP (torácica proximal) 17.8 ± 8.7 versus 21.8 ± 6.8, TM (torácica mayor) 13.5 ± 6.5 versus 21.8 ± 16.3 y L (lumbar) 5.8 ± 3.1 versus 8.9 ± 7.8; AVDI: 3.4 ± 2.8 versus 6.4 ± 3.7; DVDI: 1.9 ± 1.2 versus 2.9 ± 3.3. Adding-on se observó sólo en un paciente con Lenke 2.  Conclusiones:  el fenómeno Adding-on en pacientes con EIA a quienes se les realizó una fusión espinal posterior es una complicación poco frecuente observada a los 18 meses.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Introduction:  adolescent idiopathic scoliosis (AIS) is the most common of all scoliosis. Patients with progressive AIS require surgical treatment, but there is a percentage of patients who present progression of the deformity below the surgical area, a phenomenon known as Adding-on.  Objective:  describe the Adding-on phenomenon in patients with AIS treated surgically.  Material and methods:  a series of cases of patients with AIS, aged 12-17 years, who underwent surgical treatment were performed. All patients underwent measurements of Cobb angle, IDV (instrumented distal vertebra), IPV (instrumented proximal vertebra), NV (neutral vertebra), SV (stable vertebra) and apex, as well as angulation of the instrumented distal vertebra (AIDV) and angulation of the instrumented distal vertebra disk (AIDVD) in preoperative radiographs at one, six, 12 and 18 months. For statistical analysis, means and standard deviation of the mean were established.  Results:  sample 11 patients. Age: 14.0 ± 1.5 years. Lenke 1: 63.6%. The most frequent NV, SV, apex, IDV and IPV were: L3 (27.3%), L5 (63.6%), T8 (45.5%), L2 (34.6%) and T4 (45.5%), correspondingly. At 18 months, when comparing Lenke 1 vs 2, Cobb angle: PT (proximal thoracic) 17.8 ± 8.7 vs 21.8 ± 6.8, MT (greater thoracic) 13.5 ± 6.5 vs 21.8 ± 16.3 and L (lumbar) 5.8 ± 3.1 vs 8.9 ± 7.8; AIDV: 3.4 ± 2.8 vs 6.4 ± 3.7; AIDV: 1.9 ± 1.2 vs 2.9 ± 3.3. Adding-on was observed only in one patient with Lenke 2.  Conclusions:  the Adding-on phenomenon in patients with AIS who underwent posterior spinal fusion is a rare complication observed at 18 months.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[adolescente]]></kwd>
<kwd lng="es"><![CDATA[escoliosis]]></kwd>
<kwd lng="es"><![CDATA[enfermedades de la columna vertebral]]></kwd>
<kwd lng="es"><![CDATA[curvaturas de la columna vertebral]]></kwd>
<kwd lng="en"><![CDATA[adolescent]]></kwd>
<kwd lng="en"><![CDATA[scoliosis]]></kwd>
<kwd lng="en"><![CDATA[spinal diseases]]></kwd>
<kwd lng="en"><![CDATA[spinal curvatures]]></kwd>
</kwd-group>
</article-meta>
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