Radiology
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To illustrate the constellation of magnetic resonance (MR) findings that suggest prior patellar dislocation. ⋯ Hemarthrosis, medial patellar and lateral femoral contusion, and retinacular disruption suggest prior lateral patellar dislocation. Because of its sensitivity to subtle intraosseous signal abnormality, axial STIR imaging is a valuable adjunct in the evaluation of the acutely injured knee.