Located in the pelvis, the sacroiliac joints connect the sacrum at the base of the spine with the ilium (hip bone).
The front (anterior) part of the sacroiliac joint is covered by the anterior sacroiliac ligament, which is relatively thin, making it vulnerable to injury and pain. Accessory SI joint ligaments, such as the iliolumbar and sacrotuberous ligaments provide additional support and stability to the joint.
The back (posterior) part of the sacroiliac joint is stabilized by the posterior sacroiliac ligaments, which connect the back of the hip bones to the sacrum. Accessory SI joint ligaments, such as the iliolumbar and sacrotuberous ligaments provide additional support and stability to the joint.
