“Various problems with the sacrum make up or contribute to a significant portion of lower back problems. Can understanding the anatomy and function help prevent and treat back injuries?”
Table of Contents
The sacrum is a bone shaped like an upside-down triangle located at the base of the spine that helps support the upper body when sitting or standing and provides pelvic girdle flexibility during childbirth. It comprises five vertebrae that fuse during adulthood and connect to the pelvis. This bone takes and endures all of the body’s pressure and stress from everyday activities and movements.
Humans are born with four to six sacral vertebrae. However, fusion does not take place in all sacral vertebrae simultaneously:
The timing of the fusion can be used for estimating the age and sex of skeletal remains. (Laura Tobias Gruss, Daniel Schmitt. et al., 2015)
The sacrum is an irregular bone that makes up the back/posterior third of the pelvic girdle. There is a ridge across the front/anterior portion of the S1 vertebra known as the sacral promontory. Small holes/foramen on both sides of the sacrum are left over after the vertebrae fuse together. Depending on the number of vertebrae, there can be three to five foramen on each side, though there are usually four. (E. Nastoulis, et al., 2019)
The sacrum is at the level of the lower back, just above the intergluteal cleft or where the buttocks split. The cleft starts at around the level of the tailbone or coccyx. The sacrum is curved forward and ends at the coccyx, with the curvature being more pronounced in females than males. It connects to the L5 lumbar vertebra by way of the lumbosacral joint. The disc between these two vertebrae is a common source of low back pain.
The most common anatomical variation applies to the number of vertebrae. The most common is five, but anomalies have been documented, including individuals with four or six sacral vertebrae. (E. Nastoulis, et al., 2019)
Studies on the sacrum are ongoing, but some proven functions include:
The sacrum can be a main source or focal point for lower back pain. It is estimated that 28% of men and 31.6% of women aged 18 years or older have experienced low back pain in the past three months. (Centers for Disease Control and Prevention. 2020) Conditions that can cause sacrum pain symptoms include.
Gruss, L. T., & Schmitt, D. (2015). The evolution of the human pelvis: changing adaptations to bipedalism, obstetrics and thermoregulation. Philosophical transactions of the Royal Society of London. Series B, Biological sciences, 370(1663), 20140063. doi.org/10.1098/rstb.2014.0063
Nastoulis, E., Karakasi, M. V., Pavlidis, P., Thomaidis, V., & Fiska, A. (2019). Anatomy and clinical significance of sacral variations: a systematic review. Folia morphologica, 78(4), 651–667. doi.org/10.5603/FM.a2019.0040
Centers for Disease Control and Prevention. QuickStats: Percentage of adults aged 18 years or older who had lower back pain in the past 3 months, by sex and age group.
Barros, G., McGrath, L., & Gelfenbeyn, M. (2019). Sacroiliac Joint Dysfunction in Patients With Low Back Pain. Federal practitioner : for the health care professionals of the VA, DoD, and PHS, 36(8), 370–375.
National Library of Medicine, Chordoma.
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The information herein on "The Sacrum's Role in Your Mobility and Posture" is not intended to replace a one-on-one relationship with a qualified health care professional or licensed physician and is not medical advice. We encourage you to make healthcare decisions based on your research and partnership with a qualified healthcare professional.
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