What is the most likely diagnosis?
- 15 year-old sprinter with hip pain
Frontal Radiograph of the Left Hip
- Fracture of the Greater Trochanter
- Separation of the SI Joint
- Separation of the Symphysis Pubis
- Slipped Capital Femoral Epiphysis
- Avulsion of Ant. Inferior Iliac Spine
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Answer:
5. Avulsion of Ant. Inferior Iliac Spine
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Avulsion of Anterior Inferior Iliac Spine
General Considerations
- Avulsion fractures result when the fracture fragment is pulled from its parent bone by forceful contraction of a tendon or ligament
- Avulsion fractures are most common in younger individuals engaging in athletic endeavors
- In the pelvis, the newly formed secondary centers of ossification, the apophyses, are the most likely portions of the bone to avulse
- Since the apophyses tend to form at the time of puberty, most of these pelvic avulsions occur at the time of puberty
- In general, they are uncommon injuries, seen almost exclusively in adolescent athletes with a 2:1 male to female preponderance