The intervertebral disc in direct contact of the vertebral bodies is composed of two distinct parts:
1. A central part of the nucleus pulposus consists of a gelatinous substance established for over 88% water
2. Some outer ring, the ' fibrous ring, characterized by fibro-cartilaginous structures arranged in ten concentric layers around the core. The front directed toward the abdomen is usually thicker and stronger than the corresponding back. 
The intervertebral disc is a non-vascularized and its nourishment is the case for metabolic exchanges through a mechanism of osmotic pump from the beds around capillaries. This mechanism is triggered by movements alternating compression and decompression.
addition, the intervertebral disc through its fibrous structure located concentrically to a gelatinous core, is able to withstand considerable workload, deform and recover its height after removal of the mechanical stress.
If, however, because of degenerative disc changes its ability to perform these tasks will have a negative impact the dynamics of the upright with consequent structural damage
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