Also known as
slipped disc or intervertebral disc prolapse is a medical condition
affecting the spine, in which a tear in the outer, fibrous ring of
an intervertebral disc allows the soft, central portion to bulge
out beyond the damaged outer rings. Tears are almost always
posterior-lateral in nature owing to the presence of the posterior
longitudinal ligament in the spinal canal. This tear in the disc
ring may result in the release of inflammatory chemical mediators
which may directly cause severe pain, even in the absence of nerve
Slipped discs are most often seen between the ages of 40 and 60.
A slipped disc can be symptom free. If it causes pain, it is primarily due to the pressure on the nerve roots, the spinal cord or the caudate equine.