Anterior Sacroiliac Ligament

Original Editor - Khloud Shreif Top Contributors - Khloud Shreif and Kim Jackson


Anterior sacroiliac ligament

Anterior sacroiliac ligament (ASL) or capsular ligament, forms of numerous thin bands of connective tissues,  forming a strong broad ligament, that connect to the anterior and inferior margin of the capsule. It is rich with innervation and nociceptive fibers so maybe a source of pain sometimes


It attaches from the lateral side of the sacrumaanteriorlynd pelvic brim to the auricular of the ilium. covering the anterior surface of the SIJ.


Limiting sacral nutation. 

Clinical relevance

It is associated with sacroiliitis

It is located close to the trunk of the lumbosacral plexus(especially fibers from L4–L5) and to the obturator nerve.

Leakage of fluid to the surrounding structures at the site of the anterior capsule may happen because it is a relatively thin capsule[1].


Provocation tests of sacroiliac joint that stress the anterior SIJ ligaments:

Anterior gapping test/sacroiliac distraction test.

Yeoman's test.


  1. Vleeming A, Schuenke MD, Masi AT, Carreiro JE, Danneels L, Willard FH. The sacroiliac joint: an overview of its anatomy, function and potential clinical implications. Journal of anatomy. 2012 Dec;221(6):537-67.

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