55-year-old female with right medial knee pain. Prior arthroscopy with possible partial lateral meniscectomy and medial meniscus repair at an outside hospital. MENISCI: There is globular increased signal abnormality within the posterior horn of the medial meniscus likely representing a combination of postsurgical change and intrasubstance degeneration. There is a full-thickness radial tear of the posterior horn of the medial meniscus near its root (image 8; series 8). There is medial extrusion of the body of the meniscus. This tear also extends in a horizontal fashion into the body of the meniscus (image 9; series 8). The lateral meniscus appears intact.ARTICULAR CARTILAGE AND BONE: Heterogeneous bone marrow may represent residual islands of red marrow. There is thinning of the articular cartilage along the medial tibiofemoral compartment. There is near full-thickness articular cartilage degeneration along the weightbearing surface of the medial femoral condyle above the posterior horn of the meniscus. There is thinning of the articular cartilage of the patellofemoral joint without evidence of a full-thickness articular cartilage defect. There is a small amount of increased signal abnormality within the medial femoral condyle which may be degenerative in etiology. There are small tricompartmental osteophytes.LIGAMENTS: The cruciate and collateral ligaments appear intact. EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Radial tear of the posterior horn of the medial meniscus, near its root, with extension of the tear in a horizontal fashion into the body of the meniscus with associated medial extrusion of the meniscus. The lateral meniscus appears intact.2. Osteoarthritis of the right knee including near full-thickness articular cartilage degeneration as described above.3. Small joint effusion.