Posterior sacroiliac ligament

== Posterior Sacroiliac Ligament ==

The posterior sacroiliac ligament is a crucial structure in the human body that plays a significant role in stabilizing the sacroiliac joint. This ligament is part of the ligamentous system that connects the sacrum to the ilium of the pelvis.

Anatomy

The posterior sacroiliac ligament is divided into two parts: the short posterior sacroiliac ligament and the long posterior sacroiliac ligament.

Short Posterior Sacroiliac Ligament

The short posterior sacroiliac ligament is located deep within the pelvis. It extends from the first and second transverse tubercles of the sacrum to the posterior superior iliac spine and the adjacent part of the iliac crest. This ligament is responsible for limiting the movement of the sacrum relative to the ilium.

Long Posterior Sacroiliac Ligament

The long posterior sacroiliac ligament is more superficial compared to the short posterior sacroiliac ligament. It runs from the third and fourth transverse tubercles of the sacrum to the posterior superior iliac spine. This ligament helps to maintain the stability of the sacroiliac joint by preventing excessive forward tilting of the sacrum.

Function

The primary function of the posterior sacroiliac ligament is to provide stability to the sacroiliac joint. This joint is essential for transferring weight and forces between the upper body and the lower limbs. The posterior sacroiliac ligament, along with other ligaments such as the anterior sacroiliac ligament, interosseous sacroiliac ligament, and the sacrospinous ligament, helps to maintain the integrity of the pelvic ring.

Clinical Significance

Injuries or dysfunctions of the posterior sacroiliac ligament can lead to sacroiliac joint dysfunction, which is a common cause of lower back pain. This condition can result from trauma, repetitive stress, or degenerative changes. Treatment options may include physical therapy, medication, and in some cases, surgical intervention.

Related Structures

• Anterior sacroiliac ligament
• Interosseous sacroiliac ligament
• Sacrospinous ligament
• Sacrotuberous ligament
• Sacroiliac joint

See Also

• Pelvis
• Ligament
• Lower back pain
• Sacroiliac joint dysfunction