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Fig. 1C. —23-year-old man with acute posterolateral instability of left knee after motor vehicle collision. Sagittal spin-echo proton density—weighted image (TR/TE, 1800/20) (C) and coronal short tau inversion recovery (STIR) image (D) (3000/40; inversion time, 100 msec) reveal avulsed bone fragment (long arrow) with marrow edema in corresponding site of attachment of popliteofibular ligament adjacent to popliteal tendon (arrowhead, C). Note avulsion fracture of posterior tibial plateau at attachment of posterior cruciate ligament (short arrow, D) in coronal STIR image.