Avulsion fractures can occur at many points in the pelvis. Going clockwise from the iliac crest to the pubic symphysis on the left we have:
- Iliac crest: Abdominal muscles
- Anterior superior iliac crest: Sartorius
- Anterior inferior iliac crest: Rectus femoris
- Greater trochanter: Gluteal muscles
- Lesser trochanter: Iliopsoas. Isolated nontraumatic avulsion fractures of the lesser trochanter in adults is a pathognomonic sign of metastatic disease.
- Ischial tuberosity: Hamstrings
- Pubic symphysis: Adductor group
A stupid mnemonic is: Alabama's stoned rappers got ill hunting armadillos.
References
Bui-Mansfield LT, Chew FS, Lenchik L, Kline MJ, Boles CA. Nontraumatic avulsions of the pelvis. AJR Am J Roentgenol. 2002 Feb;178(2):423-7.
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