RESUMEN
Accurate tunnel placement is important for a successful anterior cruciate ligament (ACL) reconstruction. Controversy exists concerning the preferred method of femoral tunnel preparation, with proponents of both medial portal and transtibial drilling techniques. Current ACL literature suggests that placement of the femoral ACL attachment site posterior or "low" in the ACL footprint leads to more anatomically correct ACL mechanics and better rotational control. There is limited literature focusing on ACL graft displacement through knee range of motion based on specific paired placement of femoral and tibial tunnels. Our purpose was to assess ACL isometry between multiple combinations of femoral and tibial tunnels. We hypothesized that placement of the graft at the posterior aspect of the ACL footprint on the femur would be significantly less isometric and lead to more graft displacement as compared with central or anterior placement. The ACL of matched pairs of cadaveric knees was arthroscopically debrided while leaving the soft tissue footprint on the femur and tibia intact. One knee from each pair underwent notchplasty. In all knees, three femoral and three tibial tunnels were created at the anterior, central, and posterior aspects of the ACL footprint. A suture was passed through each tunnel combination (nine potential pairs), and the change in isometry was measured throughout full knee range of motion. Placement of the femoral tunnel along the posterior aspect of the ACL footprint was less isometric compared with a central or anterior position in the femoral footprint. Placement of a posterior tibial tunnel also led to decreased isometry, but tibial tunnel placement affected isometry to a lesser extent than femoral tunnel placement. The combination of a posterior femoral and posterior tibial tunnel resulted in greater than 1 cm of graft excursion from full flexion to extension. Placement of ACL tunnels at anisometric sites may adversely affect the mechanical properties and behavior of the ACL graft, resulting in either graft laxity in flexion or overconstraint and loss of extension.
Asunto(s)
Lesiones del Ligamento Cruzado Anterior/cirugía , Reconstrucción del Ligamento Cruzado Anterior/métodos , Fémur/cirugía , Tibia/cirugía , Lesiones del Ligamento Cruzado Anterior/fisiopatología , Cadáver , Humanos , Articulación de la Rodilla/fisiopatología , Articulación de la Rodilla/cirugía , Rango del Movimiento ArticularRESUMEN
To compare clinical and radiographic outcomes of medial epicondylar fractures treated operatively to those treated nonoperatively, 30 patients with 31 fractures were divided into three groups: (a) nondisplaced, six treated nonoperatively; (b) incarcerated fragment, four with operative treatment; and (c) displaced but not incarcerated, 21 fractures, 14 treated operatively and seven nonoperatively. Clinical outcomes were assessed with follow-up examination and the Japanese Orthopaedic Association elbow assessment score. Average elbow scores were 98 in nondisplaced fractures, 94 with an incarcerated fragment, 95 in displaced fractures treated operatively, and 94 in displaced fractures treated nonoperatively. The only nonunion was in a fracture with an incarcerated fragment. Both operative and nonoperative treatment produced good outcome scores in displaced but not incarcerated fractures, but radiographic deformity and instability were more frequent in those treated nonoperatively.
Asunto(s)
Moldes Quirúrgicos , Articulación del Codo/diagnóstico por imagen , Fijación Interna de Fracturas/métodos , Fracturas del Húmero/terapia , Adolescente , Niño , Preescolar , Estudios de Cohortes , Femenino , Fijación de Fractura/métodos , Fracturas no Consolidadas , Humanos , Fracturas del Húmero/diagnóstico por imagen , Masculino , Radiografía , Rango del Movimiento Articular , Estudios Retrospectivos , Resultado del TratamientoRESUMEN
Open treatment of pilon fractures is associated with wound healing complications. A traumatized, limited soft tissue envelope contributes to wound healing complications. Obese patients have larger soft tissue envelopes around the ankle, theoretically providing a greater area for energy distribution and more accommodation to implants. This led us to test 2 hypotheses: (1) ankle dimensions in obese patients are larger than in lean patients, and (2) the increased soft tissue envelope volume translates into fewer wound complications. A consecutive series of 176 pilon fractures treated from March 2002 to December 2007 were retrospectively reviewed. Inclusion criteria were adults who received a preoperative computed tomography (CT) scan and were treated with a staged protocol including plating. Patients with body mass index (BMI) >30 were compared to those with BMI <30 for CT-derived ankle dimensions and wound complications. Comorbidities were evaluated for their role as potential confounders. Thirty-one fractures in obese patients were compared to 83 in lean patients. The average ratio of bone area to soft tissue area at the tibial plafond was 0.35 for the obese group and 0.38 for the lean group (P=.012). There were 8 major wound-healing complications. Four occurred in the obese group (incidence 13%), and 4 in the lean group (incidence 5%) (P=.252). Ankle dimensions in clinically obese patients are larger than in lean patients. Obesity does not appear to be protective of wound-healing complications, but rather there is a trend toward the opposite.