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Fig. 6 —Sagittal oblique proton density-weighted fast spin-echo sequence (TR/TE, 4,000/34) in 35-year-old man shows full-thickness loss of articular cartilage over anterosuperior acetabulum (white arrow). Low-signal line of subchondral bone is visible, but no intermediate hyaline articular cartilage is present. Note associated subchondral cyst formation (black arrow) and bone marrow edema. Linear cleft of high signal at labral-chondral transitional zone (arrowhead) is again evident.