48 year-old female with history of posterolateral knee pain. MENISCI: The posterior horn of the medial meniscus is replaced with increased signal intensity near its root compatible with a complete or near-complete radial tear. There is ill-defined globular increased signal intensity within the remaining posterior horn and body of the medial meniscus indicating degeneration. There is mild medial extrusion of the body of the medial meniscus. The anterior horn of the medial meniscus appears normal.There is slight blunting of the free edge of the body of the lateral meniscus which may reflect mild fraying, but we see no discrete lateral meniscal tear.ARTICULAR CARTILAGE AND BONE: There are near-full thickness to full thickness defects in the articular cartilage of the medial femoral condyle above and anterior to the posterior horn of the medial meniscus. There is also diffuse thinning of the articular cartilage along the weight bearing portions of the medial tibial plateau. There is relatively mild degeneration of the articular cartilage of the lateral compartment. The patellofemoral cartilage appears normal.LIGAMENTS: The superficial band of the MCL is intact. The deep meniscotibial ligament is visible. The deep meniscofemoral ligament is not well visualized and could be torn. There is mild edema between the iliotibial band and lateral femoral condyle posterior to the lateral synovial recess which is nonspecific but may indicate a friction syndrome. The ACL and PCL are intact.EXTENSOR MECHANISM: The extensor mechanism is intact.ADDITIONAL
1.Tear of the posterior horn of the medial meniscus near its root.2.Cartilage degeneration most pronounced in the medial tibiofemoral compartment.3.Joint effusion, Baker cyst and other findings as above.