This is ostreochondritis at the point of insertion of the patellar tendon of the upper tibia. It commonly affects boys and results in pain below the knee. The pain is worse with movement and improves with rest. There is usually swelling and tenderness. The X-ray shows fragmentation of the tibial tubercle because of partial avascular necrosis. The disease is self-limiting so that it improves when bone growth stops. Treatments is symptomatic with avoidance of maneuvers that bring of the pain. This includes cycling and basketball where quadriceps contraction stresses the tendon. Activity can be resumed when the pain resumed.
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