Figure 2.

A 16-year-old male soccer and baseball athlete presented to clinic for evaluation of right anterior hip pain lasting for 6 months. The pain began after being struck by a car while riding his bicycle and landing on his right hip. (a) Anteroposterior pelvic radiograph reveals an abnormal sclerotic calcification at the level of the anterior inferior iliac spine (AIIS) (arrow). (b) The false-profile view reveals the extension of the bone prominence toward the anterior aspect of the hip joint (arrow). (c) The frog leg lateral radiograph revealed the prominent AIIS (red arrow) as well as an abnormal femoral head-neck junction with a cam-type femoroacetabular impingement morphology (white arrow). (d) A false-profile radiograph revealed decompression of the AIIS 2 years postsurgery. (e) A frog leg lateral radiograph showing a normalized femoral head-neck junction after 2-year follow-up.