Proximal MCL osseous avulsion
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There is a large osseous fragment along the medial femoral epicondyle at the expected attachment for the proximal medial collateral ligament, with multiple adjacent small comminuted fragments. This fragment is displaced from its parent site by approximately 5mm.
A mild suprapatellar effusion is noted.
Typically, when the proximal medial femoral collateral ligament (MCL) is injured, it is seen as a sprain, partial or complete tear on MRI. When this occurs, it may later calcify to produce a pellegrini stieda lesion. In this case, however, the MCL managed to hold on and drag a piece of the femur down with it when it was avulsed, which is known as a Stieda fracture.