Updated: 10/1/2018

Anterior Inferior Iliac Spine Avulsion (AIIS)

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Introduction
An apophyseal avulsion injury seen in adolescent athletes Epidemiology demographics most often in adolescents between the ages 14-17 males more often than females occurs most often in sports involving kicking Pathophysiology mechanism typically occurs due to eccentric contraction of the rectus femoris (femoral n.) as hip extends and knee is flexed causes avulsion of its anatomic origin off the pelvis
Anatomy
Anterior inferior iliac spine a bony prominence just above acetabulum is the origin of the direct head of the rectus femoris (femoral n.)
Presentation
History sudden "pop" in pelvis Symptoms pain and weakness Physical exam antalgic gait anterior hip pain and hip flexion weakness
Imaging
Radiographs show avulsion of AIIS
Treatment
Nonoperative bed-rest, ice, activity modification indications almost all treated nonoperatively technique hip flexed for 2 weeks position lessens stretch of affected muscle and apophysis follow with guarded weight bearing for 4 week
Complications
Loss of reduction Delayed union

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Questions (3)

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(OBQ12.30) A 14-year-old hurdler has the immediate onset of right hip pain after his trailing limb struck a hurdle and he falls down. Figure A demonstrates a right hip AP and lateral radiograph. The muscle originating at the injured structure is innervated by which of the following nerves? Tested Concept

QID: 4390

FIGURES:

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Genitofemoral nerve

(55/6595)

Femoral nerve

88%

(5771/6595)

Pudendal nerve

(47/6595)

Obturator nerve