An adolescent athlete may have an avulsion fracture of the anterior superior iliac spine (ASIS) during strenuous exercise.

Clinical features:

(1) adolescent athlete prior to complete ossification of the pelvis

(2) sudden onset of hip pain associated with strenuous exercise

(3) may be preceded by a period of chronic pain consistent with apophysitis

(4) exclusion of alternative diagnoses





at the origin of tensor fascia lata

swinging a baseball bat

displaced laterally

at the origin of the sartorius

running, sprinting, kicking or jumping

displaced anteriorly


direct trauma

depends on direction of trauma


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