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Mild cortical elevation at the inferior patellar pole in keeping with sleeve avulsion at the origin of the patellar tendon. Mild overlying soft tissue swelling. No appreciable laxity of the patellar tendon silhouette.
In this case, the patella is relatively mature (cartilaginous anlage almost fully ossified). Minimal stranding/oedema of the infrapatellar (Hoffa) fat pad adjacent to the inferior margin of the patella suggests injury does not extend posteriorly to the articular surface.
Note the secondary ossification centre at the tibial tuberosity. No significant fragmentation, thickening of the patellar tendon insertion, nor overlying soft tissue swelling.