Spine Article Q. Slipped Disc is one of the frequent causes of Backache. What are the function / purpose of Disc? What is Sciatica? What is PID? Ans.: Between two adjacent vertebras is fibro cartilage (rubber washer like) structure. This is called as Inter vertebral Disc. The Function of this disc is to prevent friction of vertebra on each other, reduce the shocks on the vertebral column, prevent the degeneration of vertebra; it also gives the Flexibility to the vertebral column. Q. What is the component/composition of the vertebral disc? Ans.: It is composed of 2 portions the central is called nucleus pulposus & peripheral or in the outer region the annulus fibroses. Q. What occurs in PID? Ans.: Due to repeated back strains there is tear in posterior portion of the disc and part of it slide behind where there are components of nervous system, the spinal cord, nerve roots or the nerves. This causes pressure on the spinal cord, or nerve roots o