Stephen J. Schueler, M.D.

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Broken Sacrum Anatomy

To better understand sacrum fracture, it helps to understand the anatomy of the sacrum and coccyx.

The coccyx, or tailbone, is the lowest part of the spine. The sacrum is a triangular shaped bone that lies between the lumbar vertebrae and the coccyx. Both sides of the sacrum attach the pelvis.

The spine is made up of many parts. It is supported by an upright row of stacked spine bones, called vertebrae. This column of bone starts under the skull and continues to the buttocks. The vertebrae have flexible joints, but the sacrum does not.

Anatomy examples:

  • Bones and ligaments of the pelvis
  • Sacrum and coccyx
  • Sacroiliac joint of the pelvis

Last Updated: Nov 4, 2008 References
Authors: Stephen J. Schueler, MD; John H. Beckett, MD; D. Scott Gettings, MD
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PubMed Broken Sacrum References
  1. Alsobrook J, Simons SM. Sacral stress fracture in a marathon runner. Curr Sports Med Rep. 2007 Jan;6(1):39-42. [17212911]
  2. Mehta S, Auerbach JD, Born CT, Chin KR. Sacral fractures. J Am Acad Orthop Surg. 2006 Nov;14(12):656-65. [17077338]
  3. Zaman FM, Frey M, Slipman CW. Sacral stress fractures. Curr Sports Med Rep. 2006 Feb;5(1):37-43. [16483515]
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