The greater and lesser sciatic foramen are formed by the Sacrotuberous and sacrospinous ligaments, respectively. These ligaments aid in limiting ilium flexion and rotation past the sacrum.
The sacrotuberous and sacrospinous ligaments help to stabilize the pelvis. The ligament prevents pelvic excessive twisting, low back pain, and SIJ strain by working in conjunction with the sacrotuberous ligament to prevent rotation of the illum past the sacrum. In a treatment called sacrospinous fixation suspension, the sacrospinous ligament is stitched to the tip of the vagina. Patients with uterine and vaginal prolapse are advised to have this treatment because it can provide stronger support than the weak pelvic prolapse.
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