Sacroiliac Ligaments

Introduction

Posterior view of the ligaments surrounding the sacroiliac joint

Superior view of the axially sectioned pelvis noting the sacroiliac joint and surrounding ligaments. Note the interosseous sacroiliac ligaments (asterisks)

• Strengthen and stabilize the sacroiliac joint
• Includes the sacroiliac ligaments (anterior, interosseous, posterior), sacrotuberous and sacrospinous
• Prevents forward tilting of the sacral promontory

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Sacroiliac Ligament

Anterior Sacroiliac Ligament

• Formed by thickening of anterior portion of the capsule of the SI joint
• Fibers course in an anteroinferior vector to the joint

Interosseous Sacroiliac Ligament

• Located between the tuberosities of the sacrum, ilium
• Strongest part of the sacroiliac ligament complex

Posterior Sacroiliac Ligament

• Lays on top of the interosseous component
• Fibers run superiorly and laterally in an oblique orientation
• Joined inferiorly by accessory ligaments (sacrotuberous, sacrospinous)

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Sacrotuberous Ligament

• Triangular ligament with a broad attachment
• Extends from posterior ilium, lateral sacrum and coccyx
• Inserts on to ischial tuberosity
• Helps form the Greater Sciatic Notch

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Sacrospinous Ligament

• Located deep to sacrotuberous ligament
• Triangular in shape
• Extends from lateral sacrum, coccyx, to ischial spine
• Helps form the lesser sciatic notch

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Clinical Significance

• Needs to be updated

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See Also

• Back Pain Main
• Physical Exam Back
• Back Anatomy Main

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