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Home β€Ί Body Atlas β€Ί Ligaments β€Ί Posterior Sacrococcygeal Ligament
Ligament Lower Back

Posterior Sacrococcygeal Ligament

ligamentum sacrococcygeum posterius

The posterior sacrococcygeal ligament reinforces the dorsal sacrococcygeal joint, consisting of superficial (continuation of supraspinous) and deep (continuation of posterior longitudinal ligament) layers.

Region: Lower Back
Biomechanics

Function & Actions

Resists excessive coccygeal flexion, maintains the posterior sacrococcygeal junction, and protects the sacral hiatus and caudal epidural space.

Clinical Relevance

Clinical Notes

The posterior sacrococcygeal ligament is pierced or bypassed in caudal epidural injection β€” the sacrococcygeal membrane (continuation) is the landmark for caudal block needle placement. Its partial disruption occurs in coccyx fractures.

Pathology

Common Injuries & Conditions

Caudal Epidural Block Through Sacrococcygeal Membrane

The posterior sacrococcygeal ligament/membrane is penetrated during caudal epidural injection, providing access to the caudal epidural space for pain management.

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