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Fig. 4A. —Extensive cartilage defects seen on both 3D double-echo steady-state and T1-weighted spin-echo images, as shown in 33-year-old woman with acetabular and femoral articular cartilage damage. Sagittal T1-weighted image (TR/TE, 350/14) shows signal irregularities within acetabular (curved black arrow), posterior femoral (straight white arrows), and anterior femoral (straight black arrow) cartilage. Subchondral bone cysts (curved white arrows) and sclerosis (arrowheads) are visible on acetabular side.