The objectives of this study were to analyze simultaneously meniscal and tibiofemoral kinematics in healthy volunteers and anterior cruciate ligament (ACL)-deficient patients under axial load-bearing conditions using magnetic resonance imaging (MRI). Ten healthy volunteers and eight ACL-deficient patients were examined with a high-field, closed MRI system. For each group, both knees were imaged at full extension and partial flexion ($458) with a 125N compressive load applied to the foot. Anteroposterior and medial/lateral femoral and meniscal translations were analyzed following three-dimensional, landmark-matching registration. Interobserver and intraobserver reproducibilities were less than 0.8 mm for femoral translation for image processing and data analysis. The position of the femur relative to the tibia in the ACL-deficient knee was 2.6 mm posterior to that of the contralateral, normal knee at extension. During flexion from 08 to 458, the femur in ACL-deficient knees translated 4.3 mm anteriorly, whereas no significant translation occurred in uninjured knees. The contact area centroid on the tibia in ACL-deficient knees at extension was posterior to that of uninjured knees. Consequently, significantly less posterior translation of the contact centroid occurred in the medial tibial condyle in ACL-deficient knees during flexion. Meniscal translation, however, was nearly the same in both groups. Axial loadbearing MRI is a noninvasive and reproducible method for evaluating tibiofemoral and meniscal kinematics. The results demonstrated that ACL deficiency led to significant changes in bone kinematics, but negligible changes in the movement of the menisci. These results help explain the increased risk of meniscal tears and osteoarthritis in chronic ACL deficient knees. ß

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Background: Oblique shortening osteotomy (Weil) can address lesser MP pathology but can have a high rate of complications. The purpose of this study was to review the results of a modification of the Weil osteotomy, the segmental resection metatarsal osteotomy. Materials and Methods: Between 2004 and 2006, 48 patients underwent the segmental resection osteotomy with a mean followup of 13 (range, 6 to 26) months. All the patients were evaluated with the American Orthopaedic Foot and Ankle Society (AOFAS) forefoot score and a questionnaire addressing distances they were able to walk, work limitations, sporting activity, and overall satisfaction. Results: The postoperative AOFAS forefoot score was an average of 87.6 (range, 59 to 100; SD, 10.97) and the overall satisfaction rate was 85.4%. The complication rate was 18.8% for transfer metatarsalgia, 27.1% for floating toes, 35.4% for toe weakness, 14.6% for infection, and 10.4% for wound healing problems. Conclusions: Despite the complications, the patients who underwent segmental osteotomy were satisfied with the outcome for lesser MTP joint pain and deformity. This is a preliminary study with significant refinement of the operative method as detailed in the surgical technique section. Further followup will elucidate whether additional changes are necessary in the surgical technique. Level of Evidence: IV, Retrospective Case Study

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