Left knee pain, evaluate for lateral meniscus tear or chondral injury. MENISCI: There is attenuation of the posterior horn of the medial meniscus with branching intrasubstance signal extending to both articular surfaces, indicating complex tearing. The tear extends into the body of the medial meniscus, which is extruded medially. There is a small amount of increased signal in the lateral meniscus, suggesting intrasubstance degeneration but we see no discrete tear.ARTICULAR CARTILAGE AND BONE: There is moderate degeneration of the articular cartilage of the medial tibiofemoral compartment with a focal full-thickness defect along the medial tibial plateau with underlying subchondral cyst formation and marrow edema (series #801/17).There is moderate degeneration of the articular cartilage of the patellofemoral joint, particularly affecting the lateral portions of the joint where there is full-thickness degeneration along the femoral trochlea with underlying cyst formation (series #301/23).The articular cartilage of the lateral component appears relatively spared. There are small tricompartmental osteophytes. There is mild osteoarthritis of the proximal tibiofibular articulation.LIGAMENTS: The MCL, LCL, ACL, and PCL are intact. EXTENSOR MECHANISM: There is mild intermediate signal intensity in the patellar tendon proximally and distally with prominence of the patella at the insertion of the patellar tendon, which may represent tendinosis.ADDITIONAL
1. Tearing of the medial meniscus but no lateral meniscus tear is evident.2. Osteoarthritis as described above predominantly affecting the medial and patellofemoral compartments.