Apophyseal anterior inferior iliac spine fractures are rare injuries. They most commonly occur in athletes in adolescence period. Because the ossification of pelvis is not completed, apophyses are the weakest part of musculotendinous unit during this period, thus avulsion fractures are more frequent than muscle ruptures. The fracture occurs as a result of the pull of the straight head of the rectus femoris muscle. Patients feel a severe pain localized in groin, and cannot bear weight. With conservative treatment including bed rest, analgesia, using crutches and toe-touch weight bearing, progressing to full weight bearing as tolerated, satisfactory results could be obtained. We present a 14-year old boy with anterior inferior iliac spine fracture occurred in an uncommon manner.