Chondral fracture of the femorotibial joint
Knee pain and effusion after playing badminton.
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There is a loose chondral body in the lateral parapatellar recess and a sharply delineated chondral defect of the lateral femoral condyle, neighbouring the posterior horn of the lateral meniscus.
These acute chondral injuries are easily overlooked if there is no subchondral signal alteration.