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Fig. 1C —32-year-old man with chondrolysis of shoulder after arthroscopy. T1-weighted axial (C) and axial STIR (D) images 2 years after surgery show extensive joint space narrowing (long arrow) and loss of normal articular cartilage on both sides of joint with cortical irregularity and patchy areas of change in signal intensity in subchondral marrow (short arrows) consistent with subchondral sclerosis and marrow edema involving osseous glenoid process and, to lesser extent, humeral head.