Male 30 years old Reason: left and right knee avn History: left and right knee pain. MENISCI: The menisci are normal in signal intensity and morphology.ARTICULAR CARTILAGE AND BONE: There is abnormal signal intensity with surrounding edema within the majority of the lateral femoral condyle consistent with AVN, extending to the subchondral bone plate. There is slight depression of the weight-bearing portion of the articular surface with a thin band of underlying signal abnormality consistent with a subchondral fracture. There is mild thinning and increased signal intensity of the overlying cartilage suggestive of mild degeneration but we see no full-thickness fluid-filled defect. AVN also affects the medial femoral condyle posteriorly but there is no evidence of subchondral fracture, articular surface collapse, or overlying cartilage abnormality. There is a small focus of osteonecrosis in the medial tibial condyle which does not contact the articular surface. There is mild increased signal intensity within the articular cartilage of the lateral facet of the patella, suggestive of mild chondromalacia/degeneration.LIGAMENTS: No significant abnormality noted. EXTENSOR MECHANISM: No significant abnormality noted.ADDITIONAL
Osteonecrosis as described above.