Discs do not have their own blood supply, the only way they can obtain nourishment is through motion.
Normal motion draws in nutrients and removes waste products. However, when normal activity is decreased or impaired, there will be slow, but steady change taking place in the area involved.
When circulation is affected, normal cellular activity is affected. Cell wastes build up, oxygen levels and nutrients decrease, and over time, this will affect how the tissues and joints function.

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