Extraforaminal lumbar disc herniations: CT demonstration of Sharpey's fibers avulsion
- PMID: 2717008
- DOI: 10.1007/BF00342034
Extraforaminal lumbar disc herniations: CT demonstration of Sharpey's fibers avulsion
Abstract
Forty-seven extraforaminal lumbar disc herniations (EFLDH) accounting for 7% of all lumbar disc herniations encountered during the same period of time were reviewed. L3-L4 or L4-L5 disc was involved in 89% of the cases giving rise to a L3 or L4 nerve root compression. An abnormal motion of lateral bending with rotation of the trunk was found retrospectively in 60% of the patients. In 53% of all EFLDH a bony avulsion of the vertebral end-plate facing the herniation was demonstrated at the site of attachment of Sharpey's fibers. This study suggests that this previously undescribed bony change witnesses a special injury of the spine responsible for most EFLDH.
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