68-year-old female with right knee pain and swelling for 6 months. MENISCI: There is increased signal abnormality within the posterior horn of the lateral meniscus which extends to the tibial articular surface consistent with a complex degenerative tear that extends to the body of the meniscus. There is blunting of the anterior horn of the meniscus suggestive of degeneration/tearing with a longitudinal component through the anterior horn of the lateral meniscus. The medial meniscus appears intact.ARTICULAR CARTILAGE AND BONE: There is full-thickness articular cartilage degeneration along the lateral femoral condyle above the posterior horn of the meniscus as well as along the lateral tibial plateau underlying the posterior horn and body of the meniscus with underlying subchondral signal abnormality which is likely degenerative in etiology. There is a partial-thickness articular cartilage fissure along the lateral facet of the femoral trochlea.Note is made of curvilinear serpentine increased signal abnormality within the distal femoral metadiaphysis and epiphysis as well as within the proximal tibial metadiaphysis and epiphysis consistent with osteonecrosis/bone infarcts. There is apparent subchondral collapse/fracture along the weight bearing surface of the medial and lateral tibial plateau. LIGAMENTS: The cruciate and collateral ligaments appear intact. EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Osteonecrosis of the femur and tibia with apparent focal areas of subchondral collapse/fracture along the medial and lateral femoral condyles.2. Degenerative osteoarthritic changes of the right knee.3. Large joint effusion.4. Tearing of the lateral meniscus as described above.