Sacrospinous ligament

The sacrospinous ligament (Latin: ligamentum sacrospinale), also called the sacrospinal, small sacrosciatic or anterior sacrosciatic ligament, is a thin triangular-shaped ligament of the pelvis. It is classified as a fibrous joint or syndesmosis of the human pelvis. The sacrospinous ligament is also known as one of the vertebro-pelvic ligaments.

The sacrospinous ligament extends from the coccyx and lateral side of the sacrum to the ischial spine of the ischium. It transforms the greater sciatic notch into the greater sciatic foramen, and together with the sacrotuberous ligament, it converts the lesser sciatic notch into the lesser sciatic foramen.