Roberto Negrín

Clínica Las Condes | CLC · Othopaedic

Resumen Objetivo Determinar la resistencia máxima a la tracción (RMT) de la continuación prepatelar del cuádriceps (CPC). Materiales y Métodos Se realizó un estudio en cadáveres humanos. Fueron incluidos diez especímenes, en los cuales se utilizaron los tercios proximal y medial de la cortical anterior de la patela para evaluar las propiedades mecá...

Background The use of unicompartmental knee arthroplasty (UKA) has increased and new technologies have been developed to improve patient survival and satisfaction, soft tissue balance, alignment, and component size. Robot-assisted systems offer an increase in surgical precision and accuracy. The purpose of this study is to evaluate the precision of...

There is a high prevalence of knee osteoarthritis that affects only the medial tibiofemoral compartment. In this group of patients with severe disease, the medial unicompartmental knee arthroplasty (UKA) is an excellent choice. However, this technique has a great learning curve due to the lower tolerance of improper positioning and alignment. In th...

Resumen El esquí es un deporte individual con una tasa de lesiones de 1,84 por 1.000 días esquiador en la población general. Las roturas del ligamento cruzado anterior (LCA) son algunas de las más comunes, llegando a una tasa de 5 por cada 100 esquiadores por temporada a nivel competitivo, debido a la gran exigencia a la que se encuentran sometidas...

Purpose To compare joint line restoration after unicompartmental knee arthroplasty (UKA) between conventional and robotic-assisted surgery. Previous studies have shown that joint line distalization can lead to higher failure rates. The hypothesis was that robotic-assisted UKA is associated with less femoral component distalization and a precise tib...

Robotic Assisted Unicompartimental Knee Arthroplasty

Patellar dislocation is a common knee problem, 10 times more frequent in childhood and adolescence. Medial patellofemoral ligament is injured up to 94% of the time, and its reconstruction is effective in terms of stabilization of the patella. However, distal femoral physis can be damaged with different techniques of reconstruction, due to the locat...

Anatomic description of Proximal tibiofibular joint ligament complexes

Resumen El Síndrome de Menisco Hipermóvil, caracterizado por bloqueos mecánicos dolorosos de la rodilla, tiene un sustento anatómico basado en los fascículos poplíteo meniscales anteroinferior y posterosuperior, responsables de la estabilidad primaria de la esquina posterolateral meniscal. Con un cuadro clínico característico, usualmente con Resona...

Unicompartmental knee arthroplasty (UKA) represents 10% of knee arthroplasties. Advantages are better functional results, quicker recovery, shorter hospitalization time, and lower blood loss, among others. However, revision rates are larger than total knee arthroplasty. Among the most important factors that explain this are the implant position and...

Resumen La cirugía protésica de rodilla es un procedimiento ampliamente aceptado como etapa final del tratamiento de la artrosis de rodilla, con sobrevida que supera el 90% a 10–15 años. Dentro de las principales causas de fallo, se encuentran la infección (20,4%) y el aflojamiento mecánico (20,3%). El uso de ayudas tecnológicas en cirugía está en...

Inaccurate Implantation has been identified as cause for early failure in UKA. Therefore, improve accuracy could improve results. Aim: to assess the immediate effect of image-free handheld robot on implant accuracy compared to conventional surgery in a cadaveric study based on X-Rays Conclusion: Robotic assisted UKA improves accuracy of bone cuts r...

Background: Three-dimensional (3D) printing is a technique based on overlapping layers of a material (eg, plastic, clay, and metal). The widespread implementation of 3D printers has resulted in a notable increase in use. Fields such as construction, engineering, and medicine benefit from this technique. Aim: The use of 3D printed scale models perm...

Rotational profile in patients with patellar dislocation. Is it necessary to include it in the study? Rotational Factors: play an important role. Significantly different distribution in unstable knees compared with control. Rotational profile should be included in patellofemoral protocol.

Resumen Las lesiones meniscales son las lesiones más frecuentemente asociadas a lesiones del Ligamento Cruzado anterior (LCA), encontrándose 9,3 a 16,9% en el segmento posteromedial y comprometiendo el ligamento meniscotibial. Descritas por Strobel por su apariencia artroscópica de rampa, se ha presentado su importancia dado el subdiagnóstico y el...

Posteromedial meniscotibial ligament lesions, known as meniscal ramp lesions, are typically associated with ACL injuries, but frequently underdiagnosed. When correctly diagnosed, repair is mandatory in most cases. Retraction of the soft tissues makes it difficult to repair and leads to suture failure. Previously described techniques include all-ins...

Background: Alpine skiing has high rates of knee injuries. Prophylactic knee braces (PKBs) and functional knee braces (FKBs) are often prescribed by clinicians to reduce injuries or re-injuries in skiers. Objectives: This literature review evaluates current knowledge on the biomechanical and clinical effectiveness of prophylactic and functional kne...

Summary Analysis of the lateralization of the Tibial Tubercle in Patellar instability, found to be only 59% present in altered TT-TG pathologic distance Abstract Background In patients with Patellar instability, a pathologic increase in TT-TG distance represent a risk factor. This measure is not validated as a determinant causal factor, nor provi...

Background Medial patellofemoral ligament (MPFL) is the main restrictor of lateral shifting of the patella, contributing by 60 % in the first 20° flexion of the knee. MPFL reconstruction has been performed in order to restore the stability of the patella with good results.Lyophilized Gracilis tendon allograft (LGA) compared to Cryopreserved Gracili...

La artrosis es una enfermedad del sistema musculoesquelético, con una alta prevalencia que aumenta con la edad. A nivel mundial la artrosis de rodilla y cadera es una de las causas más importantes de dolor e invalidez, particularmente en el adulto mayor. El inicio, progreso y severidad de la artrosis de rodilla se han asociado con atrofia muscular...

El esquí es un deporte que practican más de 200 millones de personas en el mundo y en nuestro país su práctica va en aumento. Las lesiones del esquí han disminuido en las últimas décadas a casi un tercio, pero se han concentrado y aumentado las lesiones específicas de la rodilla. Se realiza un revisión bibliográfica analizando los factores que infl...