Anatomical Study on the Lumbar Nerve Root at Intra and Extraforaminal Zone.

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There is a great controversy as to the anatomy of the lumbar nerve roots at the intra and extraforaminal zones. We report the anatomical study of the relationship between lumbar nerve roots and intervertebral discs and vertebral bodies at intra and extraforaminal zone.Eight human cadavers, aged 49-90 years (average 73.1 years) were studied. Laminectomy and facetectomy were performed at L1 to L5 vertebral levels to observe the lumbar nerve roots. Myelography, radiculography and CT scan were performed to confirm the anatomy of the nerve root. At the outlet of the foramen, 81.2% of nerve roots were located on the inferior edge of the vertebral body.As for extraforaminal lumbar disc herniation, nerve roots were impaired by lateral and superior sequestrated herniation.
西日本整形・災害外科学会の論文