45-year-old female with severe pain and history of avascular necrosis. Evaluate for avascular necrosis. There is a curvilinear band of abnormal signal within the right femoral head indicating avascular necrosis. The band extends from the medial aspect of the femoral head just above the fovea to the lateral aspect of the femoral head indicating involvement of the majority of the weight-bearing surface. Mild edema of the adjacent bone on T2 weighted images is noted; the majority of the necrotic segment maintains fat signal on the T1-weighted images. There is a tiny step off along the anterior/superior aspect of the femoral head suggestive of minimal articular surface collapse that we suspect is chronic. Otherwise the shape of the femoral head is maintained. Small right hip joint effusion, which is not uncommon in patients with avascular necrosis. Mild degeneration of the articular cartilage along the anterior/superior aspect of the acetabulum. The anterior labrum is partially separated from the underlying acetabulum from the 3 to 4 o'clock position just superior to the transverse acetabular ligament. We suspect this represents normal variant recess rather than a tear.On the large field of view images, evaluation of the left hip is limited due to metallic susceptibility artifact from the total hip arthroplasty. Note is made of residual red marrow but no focal abnormalities are seen. The musculature is within normal limits.
Avascular necrosis and other findings as above.