Presentation
Knee pain and crepitus for months.
Patient Data
Central osteophyte of the left lateral femoral condyle. Background mild tibiofemoral joint space narrowing and marginal osteophytic lipping.
Protuberance of bone into the articular cartilage of the posterior weight-bearing surface of the lateral femoral condyle.
Chronic vertical tear of the body of medial meniscus with adjacent loss of cartilage depth with marrow edema through the peripheral aspect of the medial femoral condyle. Subchondral cyst formation within the tibial plateau.
Patellofemoral osteoarthritis and tibiofemoral chondromalacia.
Prominent chondral defect within the lateral femoral condyle. Small tear within the anterior meniscal root of the lateral meniscus. Advanced patellofemoral arthrosis.
Case Discussion
Central osteophytes (a.k.a. subchondral or button osteophytes) are thought to arise secondary to endochondral ossification of cartilage lesions, as can be clearly seen in this case.
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