Sacrotuberous ligament

The sacrotuberous ligament (Latin: ligamentum sacrotuberale), also known as the great sacrosciatic or posterior sacrosciatic ligament, is a fan-shaped ligament located on either side of the pelvis. It is a fibrous joint or syndesmosis of the human pelvis, one of the vertebro-pelvic ligaments

The sacrotuberous ligament extends from the inferior aspect and lateral side of the sacrum to the ischial tuberosity of the ischium. Together with another vertebro-pelvic ligament - the sacrospinous ligament - the sacrotuberous ligament transforms the lesser sciatic notch into the lesser sciatic foramen.