坐骨神经痛的原因？

jacky

Causes for Sciatica

Sciatica is generally caused by the compression of lumbar nerves L4 or L5 or sacral nerves S1, S2 or S3, or by compression of the sciatic nerve itself. When sciatica is caused by compression of a dorsal nerve root it is considered a lumbar radiculopathy (or radiculitis when accompanied with an inflammatory response) from a spinal disc bulge or spinal disc herniation (a herniated intervertebral disc in the spine), or from roughening, enlarging, and/or misaligning of the vertebrae (spondylolisthesis), or degenerated discs. The intervertebral discs consist of an annulus fibrosus which forms a ring surrounding the inner nucleus pulposus. When there is a tear in the annulus fibrosis, the nucleus pulposus (pulp) may protrude through and push against spinal nerves within the spinal cord or those exiting, causing numbness or excruciating pain. Sciatica due to compression of a nerve root is one of the most common forms of radiculopathy.

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