Presentation
Patient with long standing knee pain, with history of injury to the same knee several years ago.
Patient Data
There is a curvilinear calcification seen just adjacent to the medial femoral condyle, and paralleling the femoral cortex, representative of an avulsion injury of the medial femoral collateral ligament.
There is also reduction in the medial tibiofemoral joint space, spiking of the tibial eminences and periarticular osteophytosis, in keeping with advanced osteoarthritis of the joint. An intra-articular loose body is also seen.
The patellofemoral joint also shows evidence of similar degenerative changes, and atherosclerotic calcification of the popliteal artery is also noted.
Case Discussion
A Pellegrini-Stieda lesion refers to a linear or curvilinear-like ossification adjacent to the medial femoral condyle, which is the site of proximal insertion of the medial femoral collateral ligament.
This is classically seen on the frontal projection of a knee radiograph, will parallel the femoral cortex, and is postulated to be secondary to a previous (at least 2-3 weeks old) avulsion injury of the medial femoral collateral ligament.
Pellegrini-Stieda syndrome refers to the typical presentation of medial knee pain which when evaluated radiographically shows evidence of the lesion.
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