70-year-old female with progressive knee pain and known Baker's cyst. Evaluate for meniscus tear or ligament tears and degree of degenerative changes. MENISCI: There is linear increased signal abnormality within the anterior horn of the lateral meniscus which extends to the femoral articular surface consistent with a horizontal tear. There is globular increased signal abnormality within the posterior horn of the meniscus consistent with intrasubstance degeneration. Some of the signal extends to the tibial articular surface consistent with undersurface tearing/fraying.There is globular increased signal abnormality within the body of the medial meniscus consistent with intrasubstance degeneration. Some of this signal abnormality extends to the tibial articular surface consistent with undersurface tearing/fraying. The medial meniscus otherwise appears intact.ARTICULAR CARTILAGE AND BONE: There is full-thickness articular cartilage degeneration along the posterior aspect of the lateral femoral condyle as well as along the weightbearing portion of the lateral femoral condyle above the posterior horn of the meniscus. There is also full-thickness articular cartilage degeneration along the lateral aspect of the lateral tibial plateau, beneath the posterior horn of the meniscus.There is full-thickness articular cartilage degeneration affecting the patellofemoral articulation with portions of the medial and lateral facet of the patella completely devoid of cartilage. There is underlying degenerative subchondral signal abnormality. There is near full-thickness to full-thickness articular cartilage degeneration along the lateral facet of the femoral trochlea with underlying degenerative subchondral signal abnormality. There is tricompartmental osteophyte formation.LIGAMENTS: The cruciate and collateral ligaments appear intact.EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Tear of the lateral meniscus as described above.2. Undersurface tearing/fraying of the medial meniscus.3. Small-to-moderate sized joint effusion and Baker's cyst.4. Osteoarthritic changes including full-thickness articular cartilage degeneration and other findings as described above.