• K F Kreitner, P Grebe, M Runkel, S Schadmand-Fischer, and A Meurer.
• Klinik und Poliklinik für Radiologie, Johannes Gutenberg-Universität Mainz.
• Rofo. 1995 Jul 1;163(1):32-7.

PurposeTo describe the MR imaging findings in patients with lateral patellar dislocation.Material And MethodsThe MRIs of 31 patients with patellar dislocation were evaluated retrospectively. Arthroscopic surgery was performed in 23 cases.ResultsHemarthrosis was found in 30/31, contusions of the lateral femoral condyle in 30/31 and of the medial patellar facet in 26/31 cases. Injury of the medial patellar retinaculum was seen in 28/31 cases. Osteochondral fractures were found in 18 patients; compared to arthroscopy there were one false-positive and 5 false-negative findings concerning loose cartilage bodies. In 7 cases, patellar dislocation was not suspected before MR imaging.ConclusionHemarthrosis, lateral femoral and medial patellar contusion, and retinacular disruption are typical findings after lateral patellar dislocation. A careful search for free osteochondral fragments is mandatory as it influences the indication and performance of arthroscopic surgery.

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