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Young athletes, especially around the age of puberty, are at higher risk for pelvic avulsion fractures
Often seen in sports that require sprinting, rapid changes in movement or jumping
Caused by sudden, forceful contraction of the muscles of the abdominal, the hip and thigh or the hamstring
Avulsion fractures can occur at many areas of the pelvis.
A mnemonic is: Alabama’s stoned rappers got ill hunting armadillos
· Iliac crest: Abdominal muscles
· Anterior superior iliac crest: Sartorius
· Anterior inferior iliac crest: Rectus femoris
· Greater trochanter: Gluteal muscles
· Lesser trochanter: Iliopsoas **(rare in adults)
· Ischial tuberosity: Hamstrings
· Pubic symphysis: Adductor group
http://roentgenrayreader.blogspot.com/2010/07/pelvic-avulsion-fractures.html
** Isolated nontraumatic avulsion fractures of the lesser trochanter in adults is a pathognomonic sign of metastatic disease
This site has some good images of common injury patterns
http://radiopaedia.org/articles/apophyseal-avulsion-fractures-of-the-pelvis-and-hip
References
http://roentgenrayreader.blogspot.com/2010/07/pelvic-avulsion-fractures.html