Structure
The sacrotuberous ligament connects the ischial tuberosity to the lateral borders of the lower sacrum and upper coccyx. Its fibers run inferolaterally in an oblique fashion and form a ligamentous band which blends with the fascia surrounding the pudendal vessels. Along with the sacrospinous ligament, it converts the greater and lesser sciatic notches into the greater and lesser sciatic foramina.
Function
The sacrotuberous ligament confers stability to the pelvis by limiting the movement of the pelvis and the sacrum. It permits the passage of neurovascular structures that supply the coccyx.
