Review Question - QID 149

ASIS avulsions are due to the pull of the sartorius. Avulsion fractures occur due to sudden violent muscular contraction or an excessive amount of muscle stretch across an open apophysis. There is often no external trauma. Injury occurs most often in adolescent athletes between the ages 14-17; males more often than females. Most common sites are ASIS (origin of sartorius), ischium (origin of hamstrings), lesser trochanter (iliopsoas), AIIS (rectus femoris) and iliac crest (abdominal muscles). The treatment for ASIS avulsions is generally nonoperative. Treatment consists of bedrest, ice, and positioning of limb to lessen stretch of affected muscle and apophysis. Surgery is generally reserved for failure of nonoperative treatment, or specifc types of avulsions with greater than 2cm of displacement in elite athlete's.