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Muscle balance in quadricep muscles is an important factor for patellar instability. However, in vivo, the activity of the quadriceps varies during knee motion. To simulate this clinical condition, different loading conditions of the rectus femoris, vastus lateralis, and vastus medialis oblique at different knee flexion angles were studied, and patellar(More)
Twenty-five knees with symptomatic lateral patellar instability after total knee arthroplasty (TKA) were treated by operative realignment. Causes of instability include errors in surgical technique, quadriceps imbalance, and trauma. Fourteen knees had proximal realignment, nine had combined proximal and distal realignment, and two had component revision. At(More)
The influence of lateral release of retinaculum on patellofemoral kinematics and contact characteristics after total knee arthroplasty was investigated in vitro. Lateral release altered the patellar tracking in patellar flexion, rotation, tilting, and translation. The contact force was decreased at high flexion angles. The contact area was slightly(More)
The purpose of this study was to review the authors' experiences with serial sodium Amytal (amobarbital) interviews and to compare these results with those found in the literature. A chart review of 21 patients with suspected conversion disorder evaluated by Amytal interview was conducted retrospectively. Presenting symptoms included movement disorders,(More)
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