Reason: r/o lateral meniscus pathology History: right knee pain MENISCI: There is marked degeneration and degenerative tearing of the anterior horn and body of the lateral meniscus with portions of the body of the meniscus extruded laterally along the lateral aspect of the lateral femoral condyle. There is also degeneration and superficial fraying of the posterior horn of the lateral meniscus. The medial meniscus appears intact.ARTICULAR CARTILAGE AND BONE: There is a focal full-thickness articular cartilage defect along the weightbearing surface of the medial femoral condyle above the anterior horn of the medial meniscus. There is full-thickness articular cartilage degeneration affecting the lateral tibiofemoral compartment with large areas of weightbearing surface of the lateral femoral condyle and lateral tibial plateau completely devoid of articular cartilage. There is degenerative subchondral signal abnormality in the surrounding area. There are tricompartmental osteophytes. The femoral trochlea appears shallow superiorly which may reflect mild femoral trochlear dysplasia. There is thinning of the patellofemoral articular cartilage.LIGAMENTS: The distal fibers of the ACL appears thinned which may reflect chronic partial thickness tearing. The PCL appears intact. The MCL and LCL appear intact. EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Osteoarthritis of the knee most pronounced along the lateral tibiofemoral compartment with additional focal articular cartilage defects along the medial femoral condyle. There is associated marked degeneration and degenerative tearing of the lateral meniscus as described above.2. Small joint effusion and Baker's cyst.3. Probable chronic partial-thickness tearing of the distal fibers of the ACL.