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Sacrotuberous Ligament Periosteal Bursa

bursa ligamenti sacrotuberalis

A small periosteal bursa at the sacral attachment of the sacrotuberous ligament, between the thick ligament and the posterior sacral periosteum. It develops from repetitive loading of the posterior pelvic ring in athletes and heavy manual workers.

Region: Lower Back

Clinical Relevance

Clinical Notes

Sacrotuberous ligament bursal irritation produces posterior sacral pain at the lower sacrum that may radiate to the buttock, mimicking sacroiliac joint dysfunction. It is tender on direct palpation medial to the posterior superior iliac spine. Prolotherapy and platelet-rich plasma injection into the sacrotuberous ligament attachment addresses both the ligament and adjacent bursa. It is an uncommon cause of posterior pelvic pain that responds well to targeted injection when correctly identified by ultrasound.

Pathology

Common Injuries & Conditions

Posterior Sacral Bursitis

Bursal inflammation at the sacrotuberous ligament sacral attachment producing posterior pelvic pain reproduced by direct pressure, managed with targeted injection.