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Fig. 5B. —28-year-old man with osteochondritis dissecans of anterolateral left femoral condyle. Sagittal fast spin-echo inversion recovery MR image (TR/TE, 5300/72; inversion time, 150 msec) shows high-signal interface between osteochondritic fragment and femur as well as subchondral cysts (arrow), consistent with unstable lesion. Bone marrow edema is present at femur deep relative to osteochondral lesion. Joint effusion is present.