70-year-old female, unable to walk MENISCI: There is tearing of the inner margin of the medial meniscus underlying the osteochondral fracture. The lateral meniscus is grossly intact.ARTICULAR CARTILAGE AND BONE: A large osteochondral fracture involves the medial femoral condyle, measuring 1.3 cm in transverse dimension and 1.2 cm in AP dimension. There is fluid underlying the fracture fragment indicating instability. Extensive edema is present within the medial femoral condyle. There is focal full thickness fissuring of the underlying articular cartilage of the medial femoral condyle as well as within the medial tibial plateau. Mild thinning and degeneration of the articular cartilage of the patellofemoral cartilage and trochlea.LIGAMENTS: The cruciate and collateral ligaments are intact.EXTENSOR MECHANISM: The patellar and quadriceps tendons are intact. There is prepatellar soft tissue edema.ADDITIONAL
1. Findings consistent with spontaneous osteonecrosis of the medial femoral condyle likely secondary to insufficiency fracture as described above with associated tear of the medial meniscus and full-thickness defects of the adjacent articular cartilage. 3. Moderate joint effusion.