Anterior inferior iliac spine (AIIS) avulsion injuries are one of the six main types of pelvic apophyseal avulsion fractures.
As with many pelvic avulsion injuries, they most often occur in adolescents (mostly between the ages 14-17). There is a slight male predilection and they tend to occur most often in sports involving kicking.
The avulsed bony fragment may not be as obvious on the AP radiograph as on oblique projections.
Treatment and prognosis
Almost all cases are managed conservatively.
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