Female 62 years old Reason: evaluate for AVN of left knee History: pain, stiffness. Evaluation of the knee is slightly limited by patient motion artifact.MENISCI: There is abnormal signal intensity and attenuation of the body and posterior horn of the medial meniscus, indicating a complex tear. The anterior horn appears relatively intact. The lateral meniscus appears intact.ARTICULAR CARTILAGE AND BONE: There are multiple foci of osteonecrosis within the distal femur and proximal tibia, including a small focus within the subchondral bone of the lateral femoral condyle, as well as small foci within the tibial plateau. We see no subchondral fracture or articular surface collapse. There are additional larger regions of bone infarction in the distal femoral metaphysis and proximal tibial metaphysis. There is severe osteoarthritis of the medial tibiofemoral compartment, with areas along the weight-bearing portion of the medial femoral condyle and medial tibial plateau that are devoid of articular cartilage. Signal abnormalities in the underlying subchondral bone are likely degenerative in etiology. There is mild articular degeneration of the lateral compartment. There is superficial fraying of the articular cartilage of the patella. There are small tricompartmental osteophytes.LIGAMENTS: Cruciate and collateral ligaments are intact. EXTENSOR MECHANISM: Extensor mechanism is intact.ADDITIONAL
1.Osteonecrosis as described above.2.Osteoarthritis most severely affecting the medial tibiofemoral compartment, with a complex tear of the medial meniscus.3.Joint effusion, Baker's cyst, and other findings as described above.