Slipped Disc
A spinal disc herniation (prolapsus disci intervertebralis), informally and misleadingly called a “slipped disc”, is a medical condition affecting the spine, in which a tear in the outer, fibrous ring (annulus fibrosus) of an intervertebral disc (discus intervertebralis) allows the soft, central portion (nucleus pulposus) to bulge out. 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 root compression (see “chemical radiculitis” below). This is the rationale for the use of anti-inflammatory treatments for pain associated with disc herniation, protrusion, bulge, or disc tear.
It is normally a further development of a previously existing disc protrusion, a condition in which the outermost layers of the annulus fibrosis are still intact, but can bulge when the disc is under pressure.
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