Posterior sacroiliac ligament

Posterior Sacroiliac Ligament

File:Sacroiliac joint - posterior view.png

Posterior view of the sacroiliac joint and associated ligaments

The Posterior Sacroiliac Ligament is a strong ligamentous structure located in the lower back, connecting the sacrum to the ilium of the pelvis. It is one of the principal stabilizing ligaments of the sacroiliac joint, playing a crucial role in maintaining the integrity of the pelvic girdle.

Anatomy

The Posterior Sacroiliac Ligament is composed of numerous strong, interwoven fibres that pass between the sacrum and ilium. It is divided into two parts: the superficial and deep portions. The superficial portion, also known as the dorsal sacroiliac ligament, is broad and covers the sacroiliac joint. The deep portion, also known as the interosseous sacroiliac ligament, is located deep within the joint and is much stronger and thicker.

Function

The primary function of the Posterior Sacroiliac Ligament is to prevent anterior movement of the sacrum and to provide stability to the sacroiliac joint. It also plays a role in limiting movement in the lower spine, contributing to overall spinal stability.

Clinical Significance

Dysfunction or injury to the Posterior Sacroiliac Ligament can lead to sacroiliac joint dysfunction, a common cause of lower back pain. Treatment options can include physical therapy, medication, and in severe cases, surgery.

See Also

• Sacroiliac joint
• Ligament
• Pelvis