Compression of the spinal cord by the extruded nucleus pulposus.
Herniated nucleus pulposus is a condition in which the soft, gelatinous central portion of an intervertebral disk is forced through a weakened section of the disk, causing back pain and nerve root irritation.
Complications associated with nucleus pulposus herniation can result from the compression effect on the nerve root in severe cases, resulting in motor deficit; there is also a risk of spinal cord compression in the cervical and thoracic spine in severe cases.
The annulus fibrous breaks open or cracks, allowing the nucleus pulposus to escape, resulting in disc herniation. This is known as a herniated nucleus pulposus or herniated disc, though it has also been referred to as a ruptured disc or a bulging disc.
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