Anterior inferior iliac spine

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 ASIS and aiming superomedially. 

Related pathology

Share article

Article information

rID: 53514
Section: Anatomy
Tag: pelvis
Synonyms or Alternate Spellings:
  • AIIS

Support Radiopaedia and see fewer ads

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.