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Introducción: Los implantes semiconstreñidos en la artroplastia total de rodilla están indicados cuando hay compromiso de la estabilidad de la rodilla, ya sea en cirugías primarias o de revisión. materiales y métodos:Se evaluó a 43 pacientes tratados con implantes de constricción condilar varo-valgo, en una misma institución, por el mismo equipo quirúrgico, entre 2015 y 2022. Resultados:Los resultados en las escalas de función WOMAC, KSS y Oxford fueron buenos/muy buenos. Los puntajes fueron menores en pacientes >75 años, si utilizaban asistencia para caminar y si tenían enfermedades previas (estadísticamente significativo). El 86% no tuvo dolor, el 91% estaba satisfecho y el 11% sufrió complicaciones. No hubo infecciones, ni cirugías de revisión. Conclusiones: Respetando las indicaciones y la técnica quirúrgica, las artroplastias totales de rodilla semiconstreñidas con constricción condilar varo-valgo logran buenos resultados a corto y mediano plazo, con una tasa baja de complicaciones, sin diferencias estadísticas en la función entre las cirugías primarias y de revisión. Nivel de Evidencia: III

Introduction: Semi-constrained implants in TKA are indicated in cases where knee stability is compromised, either in primary or revision surgeries. materials and methods:43 patients were evaluated at the same institution, treated by the same surgical team between 2015-2022, with Sigma TC3 (Johnson & JohnsonTM) implants. Results: the WOMAC, KSS function and Oxford functiona-lity scales had good/very good results. The scores were lower in patients over 75 years of age if they used gait assistance and if they had previous pathologies (statistically significant). 86% had no pain, 91% were satisfied, 11% had complications. There were no infections or revision surgeries. Conclusions: TKAs with Sigma TC3 present good outcomes in the short and medium term with a low rate of complications in this series, with no statistical differences in function between primary and revision surgeries. Level of Evidence: III

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An anatomically based posterolateral corner (PLC) reconstruction has emerged as a viable and clinically effective surgical technique for midsubstance ligamentous injuries in both the acute and chronic settings. There are several surgical techniques for PLC reconstruction; however, the classic anatomic reconstruction technique (LaPrade technique) is now considered the gold standard and was originally described using an Achilles tendon allograft. In this article, we describe a modified LaPrade autograft technique, in which the same tunnel position, graft passage, and fixation are used to reproduce the 3 primary stabilizers of the PLC. Instead of allografts, hamstring autografts are used while tunnel diameters and fixation devices are adapted to them. With the use of autograft tendons, difficulties related to graft length or asymmetry are encountered. We consider this technique a good alternative for an anatomically based PLC reconstruction, especially given the lower availability and higher cost of allograft tissues in several countries.