Left knee pain MENISCI: Abnormal signal intensity replaces the posterior horn of the medial meniscus at/near the root, indicating possible radial tear or root avulsion with resultant medial extrusion of the medial meniscus. There is intrasubstance degeneration of the remaining portions of the medial meniscus. There is mild intrasubstance degeneration of the lateral meniscus, but no discrete tear is appreciated.ARTICULAR CARTILAGE AND BONE: There is severe degenerative chondral thinning within the medial tibiofemoral compartment, with full thickness loss of cartilage along the weightbearing femoral condyle and tibial plateau. There is adjacent degenerative signal abnormality in the underlying subchondral bone. There is partial thickness chondral loss in the lateral tibiofemoral compartment. There is moderate chondral loss in the patellofemoral compartment, particularly along the medial patellar facet. There is also full-thickness chondral loss of the trochlea, inferiorly, with underlying reactive subchondral cyst formation.LIGAMENTS: The anterior and posterior cruciate ligaments are intact. The medial collateral ligament is intact. The lateral collateral ligament complex is intact. EXTENSOR MECHANISM: The extensor mechanism is within normal limits.ADDITIONAL
1.Edema and focal fluid collection with the medial head of the gastrocnemius muscle, suggesting high-grade strain on this nonenhanced study. An abscess with surrounding edema is considered less likely.2.Tricompartmental osteoarthritis, worst in the medial tibiofemoral compartment.3.Radial tear/root avulsion of the posterior horn of the medial meniscus.