52-year-old female with a Baker's cyst and knee pain. MENISCI: There is a large complete radial tear through the posterior horn of the medial meniscus near its root. There is minimal medial extrusion of the body of the medial meniscus. There is intrasubstance degeneration within the posterior horn and body of the medial meniscus. There is mild intrasubstance degeneration of the lateral meniscus without evidence of a tear.ARTICULAR CARTILAGE AND BONE: There is moderate partial thickness degeneration of the articular cartilage of the patella predominantly involving the medial facet and median eminence. There is a near full-thickness cleft of the articular cartilage of the medial facet of the femoral trochlea superiorly, with additional degeneration of the articular cartilage of the femoral trochlea more inferiorly. Subjectively, the articular cartilage of the medial compartment appears thinned indicating mild to moderate diffuse degeneration. There is also heterogeneity of the articular cartilage of the lateral compartment indicating mild degeneration. There are small tricompartmental osteophytes. Cystlike lesions within the intercondylar eminence likely represent intraosseous ganglia related to degeneration of the ACL. LIGAMENTS: There is thickening and increased signal intensity within the ACL indicating intrasubstance degeneration and small intrasubstance ganglia. The PCL appears intact. The MCL and LCL appear intact.EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Large radial tear of the posterior horn of the medial meniscus.2. Tricompartmental osteoarthritis.3. Degeneration of the anterior cruciate ligament.4. Small Baker's cyst.