Pelvic injuries: iliac spine avulsion (AIIS)
Anterior inferior iliac spine (AIIS) avulsion fracture
Clinical features
Aetiology
Management
Mechanism
- due to eccentric contraction of the rectus femoris (active muscle lengthening under load)
- typically seen in adolescents 14-17
- occurs most often in sports involving kicking
Clinical features
- patient may hear pop or snap at time of injury
- antalgic gait
- anterior hip pain and hip flexion weakness
Aetiology
- AIIS site of attachment for rectus femoris
Management
- Conservative typically: crutches, analgesics, and modified activity
- Recovery time usually 4-6 weeks.
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