Orthopaedics Which is the most common site of pelvic apophyseal avulsion fractures? A Lesser trochanter. B Anterior superior iliac spine (ASIS). C Anterior inferior iliac spine (AIIS). D Ischial tuberosity. 💡 Explanation Which is the most common site of pelvic apophyseal avulsion fractures? ✓ Correct Answer: D. Ischial tuberosity.