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Bone avulsion. Rectus femoris tendon. a Sagittal sonogram obtained on the anterior inferior iliac spine (AIIS) shows avulsion (dotted arrow) of a bone fragment (white arrow) from the AIIS which shows irregularity of its surface (white arrowhead). The asterisk points to a local hematoma. b, d STIR (b) and T1-weighted post-injection (c) confirm the US findings. d Anterior oblique standard radiographs
