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Anterior inferior iliac spine

Recommended video: Bony pelvis [27:56]
Overview of the bony pelvis.

The anterior inferior iliac spine (AIIS) is a rough bony projection on anterior border of the ilium of the hip, inferior to the anterior superior iliac spine and immediately above the acetabulum.

The AIIS is divided into an upper part to which the straight head of the rectus femoris attaches and a lower part which serves as an attachment point for the proximal end of the iliofemoral ligament.

Avulsions of the rectus femoris from the AIIS can occur with significant mechanical stress, particularly in sports involving kicking.  

Terminology English: Anterior inferior iliac spine
Latin: Spina iliaca anterior inferior
Definition Rough bony projection on anterior border of the ilium
Attachments Straight head of rectus femoris and proximal end of iliofemoral ligamen

Learn more about the bony landmarks of the hip bone with this study unit (and article):

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