Proximal MCL osseous avulsion

Discussion:

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

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