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Wenan, China

Zhang J.-B.,Wenan Hospital | Hao J.-Q.,Wenan Hospital | Shen Y.-L.,Wenan Hospital | Wang H.-W.,Wenan Hospital | And 2 more authors.
Chinese Journal of Tissue Engineering Research

BACKGROUND: Lateral retinacular release is the preferred treatment for patellofemoral disorders, but the long-term follow-up results reported in some literatures are not satisfied. OBJECTIVE: To analyze the improvement in patellar tracking after lateral patellar retinacular release and to determine the reasons for unsatisfactory outcomes during the follow-up. METHODS: Fifty-seven consecutive knees (34 cases), which had undergone isolated lateral patellar retinacular release, were included in the study. CT scans of each knee were performed before and after surgery with the knee at different degrees of dynamic flexion: 10°, 20°, 30°, and 40°. The following parameters were evaluated: femoral distal medial torsion angle, patellar congruence angle, and patellar lateral translation angle. Preoperative and postoperative measures of patellar tracking were compared. RESULTS AND CONCLUSION: There were 17 knees in which patellar tracking was not improved after surgery. Patellar tracking was improved in 40 knees after surgery. The improvement in patellar tracking did not reach the preoperative prediction when the femoral distal medial torsion angle was less than 9°. The femoral distal medial torsion angle is found to be an important factor influencing patellar maltracking recovery and may underlie unsatisfactory outcomes in some patients at a long-term follow-up. © 2014, Journal of Clinical Rehabilitative Tissue Engineering Research. All right resurved. Source

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