Proximal MCL osseous avulsion


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