From spine-health.com
Quote:
:Pain generated by the spinal disc
Before discussing how the disc can cause back pain, it is useful to first understand the role of a healthy disc in the spine and the anatomy.
The intervertebral disc has several important functions, including functioning as a spacer, as a shock absorber, and as a motion unit:
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Spacer. The height of the disc maintains the separation distance between the adjacent boney vertebral bodies. This allows biomechanics of motion to occur, with the cumulative effect of each spinal segment yielding the total range of motion of the spine in any of several directions. Proper spacing is also important because it allows the intervertebral foramen to maintain its height, which in allows the segmental nerve roots room to exit each spinal level without compression (e.g. a pinched nerve).
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Shock absorber. Shock absorption allows the spine to compress and rebound when the spine is axially loaded during such activities as jumping and running. Importantly, it also resists the downward pull of gravity on the head and trunk during prolonged sitting and standing.
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Motion unit. The elasticity of the disc allows motion coupling, so that the spinal segment may flex, rotate, and bend to the side all at the same time during a particular activity. This would be impossible if each spinal segment were locked into a single axis of motion.
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