Anterior inferior iliac spine

Last revised by Calum Worsley on 15 Nov 2020

The anterior inferior iliac spine (AIIS) is bony prominence on the anterior border of the ilium forming the superior border of the acetabulum.

Attachments include the Iliacus, origin of straight head of the rectus femoris, and also the proximal ileofemoral ligament (Y-ligament or ligament of Bigelow). 

It is a useful anatomical landmark: needle puncture of hip joint may be approached 5 cm below the AIIS and aiming superomedially. 

Related pathology

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