Can understanding the nucleus pulposus help in body positioning and prevention for individuals wanting to practice spinal hygiene and protect their discs from injury?
Nucleus Pulposus
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:
It forms the tough circular exterior and comprises concentric sheets of collagen fibers or lamellae surrounding the inner core.
It has cartilaginous endplates that firmly attach to the vertebrae above and below.
Nucleus Pulposus
The nucleus pulposus is the inner core soft filling of the discs.
It contains a network of fibers suspended in a mucoprotein gel with a water base to maintain strength and pliability.
The near-liquid consistency makes it responsive to movement to handle the body’s axial load.
It helps maintain spinal suspension to prevent pressure on the bones and prevent bone-to-bone contact, reducing the potential for injuries and pain.
Shock Absorber
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.
Spinal Action
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.
Injuries
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.
Aging
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.
The Science of Functional Healing
References
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. https://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. https://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. https://doi.org/10.25122/jml-2021-1059
When stress is placed on the shins with physical activity from walking, running, or exercise, the connective tissues attaching the leg muscles to the tibia can become inflamed, causing medial tibial stress syndrome, more commonly known as shin splints. This inflammation is caused by tiny tears in the muscles and tendons of the shin. Chronic shin pain could be related to foot arch problems, underlying issues with the muscles, or shoes that don’t support the feet properly. Although it usually goes away within a few days, it’s important to monitor to ensure that it does not progress into a stress fracture. A chiropractor can offer treatments to relieve the pain and help prevent shin splints from recurring.
Medial Tibial Stress Syndrome
Medial tibial stress syndrome can impact anyone. It can come from walking far distances or in awkward positions like going downstairs with small steps, jumping rope, and playing with the kids on the playground can all cause burning, tightness, and pain in the shins. Shin splints affect individuals differently. For some, the pain recedes when the triggering activity is stopped. For others, the pain can become a chronic condition that results in continuous pain, even when at rest.
The Shin
The shin is a part of the tibia bone in the lower leg.
This bone absorbs the shocks when moving through daily activities.
The muscles that run along the shin support the foot’s arch and raise the toes during movement.
Medial tibial stress syndrome is caused by excessive force on the shinbone and the tissue around it, which causes the muscles to swell and increases pressure around the bone.
If left untreated, small tears in the muscle and the bone can form, leading to chronic pain and stress fractures.
Medial tibial stress syndrome is more likely to happen from:
Not stretching before physical activity or exercise.
Constantly walking or running on hard surfaces.
Wearing the wrong shoes that don’t provide enough cushioning or arch support.
Over-exertion on the body with activity and movement.
The body is not given the proper amount of time to recover.
Athletes often experience shin splints when they’ve intensified their training routine or changed it up.
Symptoms
Pain during exercise or activity.
Pain in the front of the lower leg.
Soreness in the lower leg.
Swelling in the lower leg.
Shin is hot to the touch.
Treatment
Whenever pain is being experienced, some muscles will either get tight or weak in response. By identifying the weak and/or tight muscles, a chiropractor can prescribe stretches and exercises that will help alleviate the pain and prevent it. One of the main principles of chiropractic is to treat the body as an interconnected system. A chiropractor may work on an unrelated part of the body to treat the symptomatic area. For example, they may work to align the spine and pelvis to lessen the impact on the lower legs.
Part of a treatment plan may include:
Soft Tissue Mobilization
A handheld instrument loosens tight tissues during soft tissue mobilization therapy and breaks scar tissue around the tibia.
Massaging tight muscles in the leg keeps them loose and alleviates the pain.
Percussion massage can be added to reduce muscle knots, improve blood flow, and loosen up scar tissue.
The treatment relieves pain and can help avoid shin splints when returning to normal activities.
Ultrasound and Low Laser Therapy
Ultrasound and low laser therapy use heat to warm the deep tissues in the lower leg gently.
The treatment eases pain, reduces inflammation, swelling, and increases blood flow.
Kinesio Taping
Applying flexible Kinesio tape to the foot and lower leg can reduce stress on the shins.
The chiropractor or physical therapist will show how to apply the tape correctly.
Foot Orthotics
Individuals may be more likely to develop shin splints if they have high or low arches or their feet tend to roll inward or outward when walking.
Prescription foot orthotics can be made to keep the feet properly balanced and supported.
Stretching Exercises
Shin splints could be related to tight muscles in the back of the calf and weak muscles in the front of the lower leg.
A chiropractor or physical therapist will show stretching and strengthening exercises to maintain muscle balance.
Body Composition
Retaining Water Due To Salt Intake
Salt/sodium is everywhere and hard to avoid.
It might not be a surprise that a single patty cheeseburger contains over 500 mg of sodium – almost a quarter of the daily recommended level, but it is a surprise to know that the ranch dressing on a salad contains as much as 270 mg or a tablespoon of soy sauce on a healthy, vegetable-only stir-fry has 879 mg of sodium. The Mayo Clinic estimates that the average individual consumes about 3,400 mg of sodium a day: close to double what is recommended. Sodium is linked with water retention, and it is the kidneys’ job to expel unneeded sodium out of the body. Until the kidneys activate, an individual will temporarily be retaining extra water. If daily water and sodium intake habits change daily, this can contribute to water retention, causing fluctuations in daily weight. So, if an individual was on a diet but flooded the body with more salt than usual, expect to see a temporary increase in weight.
References
Bates, P. “Shin splints–a literature review.” British journal of sports medicine vol. 19,3 (1985): 132-7. doi:10.1136/bjsm.19.3.132
Chiropractic Economics: The Science Behind Percussion Massage.
Gross, ML et al. “Effectiveness of orthotic shoe inserts in the long-distance runner.” The American journal of sports medicine vol. 19,4 (1991): 409-12. doi:10.1177/036354659101900416
Heer, Martina et al. “Increasing sodium intake from a previous low or high intake affects water, electrolyte and acid-base balance differently.” The British journal of nutrition vol. 101,9 (2009): 1286-94. doi:10.1017/S0007114508088041
McClure, Charles J. and Robert Oh. “Medial Tibial Stress Syndrome.” StatPearls, StatPearls Publishing, 11 August 2021.
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