spinal segmentIntervertebral Discs


The disc between two vertebrae will influence the movement of those vertebra, allowing rolling, rotation and translation of one vertebra on another.


The size of the disc is proportional to the motion allowed.


Degeneration of the disc reduces disc height this in turn causes an imbalance in its relationship with the joints at the back of the vertebra.


There are ligaments running down the length of the vertebral column that limit forward and backward bending of the vertebra.


At the back of the vertebra other ligaments are also present that collectively create a firm connection between vertebra and limit excessive movement.

 

If a disc becomes degenerative the loss of disc height can loosen the supportive action of the ligaments allowing possible forwards or backwards slippage of the vertebra.