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Sacroiliac Joint

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  • Large, auricular-shapred, diarthrodial synovial joint
  • Largest axial joint in the body
  • Formed by the interaction of the Sacum and Ilium
  • Roughly anterior 1/3 of these two bones represents articulation
  • The rest is composed of complex set of ligamentous connections
    • Primarily: anterior and posterior interosseous ligaments
    • Accessory iliolumbar, sacrotuberous, and sacrospinous ligaments
  • Supported by a network of muscles including


  • Primary action is stability of trunk and lower extremities
    • Transfer of load between trunk and lower extremities
  • Limits rotation in the transverse axis
  • Facilitates parturition (child birth)
  • Limited mobility, allowing for only about 2 degrees of motion in each plane[1]

Vascular Supply


  • Somewhat controversial
  • Lateral branches of dorsal rami of L4-S3

Clinical Significance

See Also


  1. Vlemming A, Schuenke MD, Masi AT, et al. The sacroiliac joint: an overview of its anatomy, function and potential clinical implications. J. Anat. 2012; 221:537–67.
Created by:
John Kiel on 2 June 2020 22:14:49
Last edited:
4 June 2020 12:09:35