Reason: right knee pain and locking, r/o meniscus injury History: right knee pain and locking MENISCI: The majority of the anterior horn of the lateral meniscus is replaced with intermediate signal intensity, indicating extensive degeneration and degenerative tearing, which extends into the body of the meniscus as well. There is intrasubstance degeneration of the posterior horn of the lateral meniscus. There is lateral extrusion of the body of the lateral meniscus. There is intrasubstance degeneration of the posterior horn of the medial meniscus with probable fraying along its undersurface. There are small cysts posterior to the posterior horn of the medial meniscus.ARTICULAR CARTILAGE AND BONE: There are tricompartmental osteophytes. There is severe degeneration of the articular cartilage of the lateral compartment with diffuse full-thickness cartilage loss along the weightbearing surface of the lateral femoral condyle and lateral tibial plateau. There is subchondral cyst formation within the underlying lateral femoral condyle. There is also near full-thickness to full-thickness cartilage loss along the weightbearing surface of the medial femoral condyle above and anterior to the posterior horn of the medial meniscus. There is mild focal degeneration of the articular cartilage of the femoral trochlea, centrally. There is degenerative signal abnormality within the intercondylar eminence.LIGAMENTS: The ACL is indistinct, which we suspect represents a combination of mucoid degeneration and chronic tearing. The PCL appears intact. The MCL and LCL appear intact. EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Severe osteoarthritis of the knee including full-thickness articular cartilage degeneration most pronounced along the lateral tibiofemoral compartment.2. Extensive degeneration and degenerative tearing of the lateral meniscus. Degeneration and fraying of the medial meniscus.3. Mucoid degeneration and chronic tearing of the ACL.4. Moderate-sized joint effusion extending posteromedially into a small Baker's cyst.5. Septated collection between the iliotibial band and lateral femoral condyle may represent a bursitis or ganglion formation.