73-year-old female with intractable knee pain, evaluate for degree of osteoarthritis, meniscus tear, and Baker's cyst MENISCI: Globular intermediate signal within the lateral meniscus suggestive of intrasubstance degeneration without focal tear. There is medial extrusion of the medial meniscus with fragmentation and heterogeneous signal within the posterior horn compatible with degeneration.ARTICULAR CARTILAGE AND BONE: Severe osteoarthritis affects the knee with joint space narrowing worst at the patellofemoral compartment followed by the medial tibiofemoral compartment. There is complete to near complete loss of articular cartilage along the medial facet of the patella and medial femoral trochlear cartilage. There is near complete to complete loss of articular cartilage along the lateral facet of the patella and lateral femoral trochlear cartilage. There is greater than 50% articular cartilage loss of the medial tibiofemoral compartment. Abnormal edema type signal is seen within the medial femoral condyle and medial tibial plateau. To a lesser degree, there is greater than 50% articular cartilage loss along the lateral tibiofemoral compartment.LIGAMENTS: The cruciate and collateral ligaments are intact. There is ossification of the MCL near its insertion on the medial femoral condyle suggestive of a prior tear.EXTENSOR MECHANISM: The extensor mechanism is intact. ADDITIONAL
1.Severe osteoarthritis as described above. 2.Degeneration and fragmentation of the posterior horn of the medial meniscus. 3.Intrasubstance degeneration of the lateral meniscus. 