Spinal discs serve as shock absorbers between vertebrae, consisting of a tough outer ring (annulus fibrosus) and a water-rich gel center (nucleus pulposus). In healthy adults, discs contain approximately 80% water, providing the cushioning and flexibility needed for daily movement. However, beginning around age 30, discs naturally lose hydration at a rate of about 1-2% per decade, making them increasingly vulnerable to tears and herniations.
This progressive dehydration, known as disc desiccation, weakens the structural integrity of the annulus fibrosus. As the outer fibers become brittle and less elastic, repetitive microtrauma from daily activities creates small tears that accumulate over time. Chiropractic adjustments help maintain proper spinal alignment, reducing the uneven mechanical loading that accelerates disc degeneration.
The lumbar spine (lower back) bears the greatest mechanical load during bending, lifting, and twisting, which is why approximately 90% of herniated discs occur at the L4-L5 or L5-S1 levels. When the herniated material contacts the nerve root, it triggers both mechanical compression and a chemical inflammatory response that amplifies pain signals.
