The sacrotuberous ligament is fan-shaped and larger than the sacrospinous ligament located on either side of the body.

It has several attachment sites, and it is located posterior to the sacrospinous ligament.

The upper portion is connected to the posterior superior iliac spine and the posterior sacroiliac ligament. As the ligament descends, it also attaches to the fourth and fifth transverse tubercles of the sacrum, lateral sides of the lower sacrum, and proximal part of the coccyx.

The ligament goes obliquely downward and inserts medially to the ischial tuberosity.

Additional fibers known as the falciform process extend to the ischial ramus.

The sacrotuberous ligament is also an origin site for the lower fibers of the gluteus maximus muscle.

Few fibers of the sacrotuberous ligament also fuse with the tendon of long head of the biceps femoris muscle.

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Sacrotuberous ligament