The discs between the vertebra are like gel filled sacs. When the outer covering of the sac gets a hole in it, the contents can leak out rather than pushing out (as in a herniated disc). When the gel leaks out over time, it can lead to an inflammatory condition known as a chemical radiculitis. This is usually best treated using epidural steroid injections or selective nerve root blocks. If the inflammation isn't reduced, scarring around the nerve roots can develop.