Avulsion fracture of the anterosuperior iliac spine is a rare injury, typically occurring in adolescents during sports activities. We present a case of a 13-year-old adolescent who experienced recent pelvic trauma, resulting in inguinal pain and functional impairment of the left lower limb. Clinical examination revealed pain upon hip mobilization and extension of the left hip joint. Pelvic X-ray revealed a fracture-avulsion of the anterosuperior iliac spine. The patient was managed conservatively with rest and unloading of the injured lower limb. Follow-up showed resolution of pain within a few weeks and the resumption of sports activities at six months.