Medial knee pain after twisting injury. MENISCI: There is horizontal tear of the posterior horn of the lateral meniscus extending to the inferior surfact. There is mild undersurface fraying of the medial meniscus without discrete tear.ARTICULAR CARTILAGE AND BONE: There is extensive bone marrow edema type signal in the lateral femoral condyle with similar milder changes in the lateral tibial plateau.There is moderate tricompartmental cartilage degeneration, worst at the undersurface of the patella.LIGAMENTS: There is high T2 signal about the lateral collateral ligament complex with surrounding soft tissue edema and a partial LCL tear cannot be excluded. The MCL is intact. The cruciate ligaments are intact.EXTENSOR MECHANISM: No significant abnormality noted.ADDITIONAL
1. Horizontal tear of the posterior horn of the lateral meniscus, as above.2. High T2 signal about the lateral collateral ligament complex, which may represent a partial tear of the LCL.3. Thickened medial retinaculum, suggestive of injury, without discrete tear. 