Avulsion fracture - anterior superior iliac spine
- Anterior superior iliac spine (ASIS) avulsion fractures typically occurs during athletic competition.
- ASIS is the site of attachment for sartorius and tensor fascia lata.
- Of the common types of pelvic fractures (pelvic ring fractures, acetabular fractures), avulsion fractures are the most benign.
- These can usually be treated on an outpatient basis with crutches, analgesics, and modified activity.
- Spontaneous recovery usually occurs within 4 to 6 weeks.
- Occasionally, surgical intervention is required to remove painful fragments or to regain anatomic fixation.
 Pelvic avulsion fractures and attaching muscles
- Anterior superior iliac spine: Sartorius and tensor fascia lata
- Anterior inferior iliac spine: Rectus femoris
- Iliac crest: Abdominal musculature
- Ischial tuberosity: Hamstrings
- Greater trochanter: Hip rotator muscles
- Lesser trochanter: Iliopsoas
 Imaging Findings