Iliac crest avulsion
This young athlete presented with pain after running in a competition.
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There is separation of the left iliac crest apophysis in keeping with an avulsion injury. The hips are normal.
Iliac crest avulsion is the least common of five possible avulsion injuries that can occur in the pelvis: ischial tuberosity, anteriorinferior iliac spine, anterior superior iliac spine, superior pubic symphysis and iliac crest. Forceful contraction of anterior abdominal wall muscles are the cause of iliac crest avulsion.