Male 77 years old Reason: r/o internal derangement, Baker's cyst History: knee pain; mild OA seen on xray MENISCI: The menisci are intact.ARTICULAR CARTILAGE AND BONE: Bone marrow signal is normal. There is complete loss of cartilage of the lateral portion of the medial patellar facet measuring approximately 7 mm in width (series 401, image 19). There is tricompartmental generalized cartilage thinning, greatest in the medial compartment, without focal defect elsewhere. LIGAMENTS: The ACL, PCL, and MCL are intact. The lateral collateral complex is also intact. EXTENSOR MECHANISM: Extensor mechanism is intact.ADDITIONAL
1.Full-thickness cartilage defect in the lateral portion of the medial patellar facet. Generalized cartilage thinning elsewhere2.Baker's cyst.