Pellegrini-Stieda lesion

Case contributed by Behrang Amini
Diagnosis almost certain
Annotated image

Pellegrini-Stieda lesion refers to post-traumatic ossification in or near the medial collateral ligament near the margin of the medial femoral condyle. One presumed mechanism of injury is a Stieda fracture (avulsion injury of the medial collateral ligament at the medial femoral condyle).

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