Baker cyst with synovial chondromatosis
Left knee pain and swelling.
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Left knee joint shows triple compartment osteoarthritis seen as decreased medial femorotibial compartment joint space, subchondral sclerosis, medial compartment articular cartilage thinning, marginal and patellofemoral osteophyte formation.
Total knee arthroplasty is seen on the right side.
Chondromalacia patellae as subchondral sclerosis and cyst formation are seen at the medial and lateral facet joints of patella bilaterally.