Figure 2.

(a) Preoperative X-ray of the right hip, Ficat and Arlet Stage 1 avascular necrosis in a steroid-induced patient. (b and c) T2 images of axial section and coronal section of magnetic resonance imaging showing bilateral disease hypointense lesion, edema, and collection. (d) Immediate postoperative X-ray following core decompression, showing tracts of core decompression. (e and f) Fifty eight months followup X-ray AP view and frog-legged lateral view demonstrating intact sphericity of the femoral head, that is, Ficat and Arlet Stage 1