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
Limiting sacral nutation.
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.
Provocation tests of sacroiliac joint that stress the anterior SIJ ligaments:
- 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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