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Typical findings of lateral patellar dislocation but instead of the typical disruption to the medial patellar facet, the patella has cleeved off a large fragment of the lateral femoral condyle (Large full thickness, osteochondral defect of the lateral femoral condylar articular surface).
Disruption to the medial patellar retinaculum and bone bruising on the infero-medial patella. Note the shallow trochlear groove.