Young adult. Pain along medial aspect of knee for several months. Recalls previous football incident.
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Thin linear bone fragment paralleling the medial femoral condyle.
No joint effusion.
No soft tissue calcification.
The appearances are classical of a Pellegrini-Stieda lesion. The ossified fragment is adjacent to the margin of the medial femoral condyle at the site of the medial collateral ligament and is thought to be due to an avulsion injury.