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Fig. 1C —16-year-old boy with pain and swelling after fall. T2-weighted sagittal proton-density image (3,000/14) with fat saturation shows small osteochondral defect (short arrows) involving lower aspect of lateral trochlear groove. Small osteochondral fragment (long arrow) is noted immediately adjacent to defect. Note that osteochondral injury is located at posterior margin of lateral femoral condyle contusion.