Fig 3.

(A) Axial T2-weighted fat saturated MRI through both hip joints demonstrates heterogeneous high signal within the region of both femoral heads. Additionally, there is subchondral collapse of the left femoral head (white arrowhead) and a corresponding moderate left hip joint effusion (black asterisk). There is no acetabular involvement of either hip.

(B) Sagittal proton-density fat saturated MRI of the left hip demonstrates the region of subchondral collapse (white arrowhead). Heterogeneous high signal within the femoral head and a joint effusion (black asterisks) are again visualized.