Can understanding the nucleus pulposus help in body positioning and prevention for individuals wanting to practice spinal hygiene and protect their discs from injury?
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The spinal discs are located between the spine’s vertebrae and are the body’s natural impact and shock absorbers. Within the disc is the nucleus pulposus, which plays a major role in providing the spine with shock absorption during movement. (Zhou Z. et al., 2014) The discs have a tough outer portion and a soft inner core. They are the:
Each intervertebral disc is a shock-absorbing cushion, with the nucleus pulposus providing shock-absorbing properties (Zhou Z. et al., 2014). The intervertebral discs move as the body moves. For example, when arching the back, the disc moves forward slightly, and when twisting, the disc twists as well.
The intervertebral disc supports spinal movements. When bending, twisting, arching, or tilting the spine, the nucleus pulposus swivels to accommodate these actions. These repeated spinal actions, which occur throughout the day and night, contribute to shifting positions while sitting, working, playing sports, carrying groceries, performing house chores, etc. An example is bending forward to pick something up. This action involves forward spinal flexion, which is bending the spine forward, flattening, or rounding. When bending using flexion, the spinal bones come closer together, pushing the nucleus pulposus toward the back.
The disc can be pushed too far back with persistent or excessive spinal flexion. If the fibers of the annulus fibrosus become weak, they can tear, causing the nucleus pulposus to leak out and disc herniation. Generally, the nucleus pulposus will leak to the side and back; however, this corresponds to the location of the very sensitive nerve root/s with which it can come into contact, causing pain and other symptoms. The most common causes of disc herniation are degenerative wear and tear changes of the disc and trauma. Disc degeneration occurs as the body ages; it weakens the annulus fibers, allowing the nucleus pulposus to distend, bulge, or herniate.
Disc degeneration occurs with age but can also occur with injuries to the area. In young individuals, the nucleus pulposus is mostly water. For this age group, a herniation from trauma is more likely than in older individuals. (Ucar, D. et al., 2021) But as the body ages, the discs, especially the nucleus pulposus, begin to dry out. This dehydration leads to a significant loss of disc height. (UCLA Health, 2024) By age 60 or 70, the discs may be composed entirely of fiber, which can cause the shock absorption function not to work and disappear.
Chiropractic therapy is among the more conservative treatment options for a herniated disc and may be tried first before proceeding with more invasive treatments. Injury Medical Chiropractic and Functional Medicine Clinic works with primary healthcare providers and specialists to develop an optimal health and wellness solution that fully benefits the individual to get back to normal.
Zhou, Z., Gao, M., Wei, F., Liang, J., Deng, W., Dai, X., Zhou, G., & Zou, X. (2014). Shock absorbing function study on denucleated intervertebral disc with or without hydrogel injection through static and dynamic biomechanical tests in vitro. BioMed research international, 2014, 461724. doi.org/10.1155/2014/461724
Nosikova, Y. S., Santerre, J. P., Grynpas, M., Gibson, G., & Kandel, R. A. (2012). Characterization of the annulus fibrosus-vertebral body interface: identification of new structural features. Journal of anatomy, 221(6), 577–589. doi.org/10.1111/j.1469-7580.2012.01537.x
Ucar, D., Duman, S., Bayram, Y., & Ucar, B. Y. (2021). Extruded disc herniations are experienced earlier by inactive young people in the high-tech gaming era. Journal of medicine and life, 14(3), 402–407. doi.org/10.25122/jml-2021-1059
UCLA Health. (2024). Degenerative disc disease (Conditions Treated, Issue. www.uclahealth.org/medical-services/neurosurgery/conditions-treated/degenerative-disc-disease
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The information herein on "The Inner Core: Nucleus Pulposus and Spinal Discs" 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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