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Restoration of patellofemoral congruity by combined lateral release and tibial tuberosity transposition as assessed by MRI analysis

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Abstract

Twelve knees in eleven patients with subluxation or dislocation of the patella were assessed by MRI at 0, 10, 20 and 30 degrees of knee flexion, before and after vastus lateralis release and medial transplant of the tibial tuberosity. The preoperative position of the patella deviated the greatest from normal in 0–20 degrees of knee flexion. The operations were found to correct the lateral patellofemoral angle and the lateral patella tilt with or without quadriceps muscle contraction, but did not completely correct the marked preoperative lateral patellar displacement and tracking.

Résumé

Dans 12 genoux présentant une subluxation ou une luxation de la rotule, la situation de celle-ci a été analysée en utilisant la technique de l'imagerie par résonance magnétique. Les images ont été réalisées, avant et après l'opération, le genou à 0, 10, 20 et 30 degrés de flexion. La position préopératoire anormale de la rotule était parfaitement visible sue le genou étendu ou fléchi à 20°. La libération externe associée à la transposition de la tubérosité tibiale antérieure corrigeait cette déviation, surtout par rapport à l'angle fémoro-patellaire externe, avec et sans contraction du quadriceps. La correction du déplacement externe de la rotule n'était pas complète lorsque la déviation externe préopératoire était particulièrement importante.

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Koskinen, S.K., Hurme, M. & Kujala, U.M. Restoration of patellofemoral congruity by combined lateral release and tibial tuberosity transposition as assessed by MRI analysis. International Orthopaedics 15, 363–366 (1991). https://doi.org/10.1007/BF00186880

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