Avulsion fractures of the apophyses of the pelvis rarely occur in adolescent athletes as a result of sudden and strong contraction of the muscles attached to the growth cartilage. We present a 16-year-old male patient who had an avulsion fracture of the left anterior superior iliac spine while he was playing volleyball. He presented with complaints of pain in the left hip and difficulty in walking. The diagnosis was made by means of pelvis x-rays, computed tomography, and three-phase radionuclide bone imaging. He underwent conservative treatment with a non-steroidal anti-inflammatory drug and bed rest. After two weeks, ambulation with crutches was allowed. At the end of four weeks, he was able to walk without crutches. He returned to his preinjury level of sports activities at the end of six weeks, without any complaint of pain.