Avulsion fracture of the anterior inferior iliac spine.

A 14-year-old was admitted with right groin pain which has started after kicking ball in a football game one week before. He had limited active and passive hip extension. A plain AP radiograph of the pelvis revealed a bone fragment displaced inferiorly about 1 cm from the right anterior inferior iliac spine. The patient was treated conservatively with analgesics and limited weight bearing. Four weeks later, range of motion was normal without pain and at eighth week the hip flexors regained full strength.