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Anteriorposterior (AP) view of the knee shows linear ossification/calcification in the proximal medial collateral ligament (MCL). Lateral view demonstrate joint effusion in the supra-patella recess.
Pellegrini-Stieda lesion is thought to be the result of stripping of the femoral periosteum near the origin of the MCL which leads to heterotopic ossification and dystrophic calcification.