44-year-old female patient with left knee pain. MENISCI: There is attenuation of the body and posterior horn of the medial meniscus with increased signal intensity. There is also branching increased signal intensity extending to both the tibial and femoral articular surfaces, indicative of extensive complex tearing. There is abnormal signal intensity adjacent to the complex tear and underlying the medial collateral ligament that likely represents synovitis. Slight medial extrusion of the body of the medial meniscus is noted. The anterior horn of the medial meniscus is relatively intact. There is no lateral meniscal tear.ARTICULAR CARTILAGE AND BONE: There is severe osteoarthritis at the patellofemoral joint with much of the lateral patellar facet devoid of articular cartilage and prominent subchondral cysts in the patella with associated edema-like signal. There is also full-thickness degeneration of the cartilage of the lateral facet of the femoral trochlea. There is slight lateral subluxation of the patella relative to the center of the trochlea. Flattening of the trochlear groove is suggestive of underlying trochlear dysplasia.In the medial compartment there is near full-thickness chondral loss along the femoral condyle just anterior to the posterior horn of the medial meniscus. There is heterogeneity of the articular cartilage of the tibial plateau, suggesting mild degeneration with subchondral cyst formation along the periphery of the tibial plateau.In the lateral compartment there is mild heterogeneity of the articular cartilage of the femoral condyle and tibial plateau, suggesting mild degeneration.There are tricompartmental osteophytes.LIGAMENTS: There is medial bowing of the medial collateral ligament related to underlying degenerative changes and is otherwise intact. Anterior cruciate ligament, posterior cruciate ligament, and lateral collateral ligament complex are intact.EXTENSOR MECHANISM: The quadriceps and patellar tendons are intact.ADDITIONAL
1.Severe osteoarthritis, particularly affecting the patellofemoral joint, with findings suggesting underlying femoral trochlear dysplasia and elevated tibial tubercle-trochlear groove distance.2.Extensive tearing of the medial meniscus.