Index to Chiropractic Literature
Index to Chiropractic Literature
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ID 20979
  Title Morphological changes of the in vitro cervical vertebral canal and its cast form during flexion, extension, and lateral bending
URL http://www.ncbi.nlm.nih.gov/pubmed/20170779
Journal J Manipulative Physiol Ther. 2010 Feb;33(2):132-137
Author(s)
Subject(s)
Peer Review Yes
Publication Type Article
Abstract/Notes Objective: The purpose of this study was to investigate and measure morphological changes in the vertebral canal and its cast form at the level of the cervical spine in vitro during flexion, extension, and lateral bending in cadaver specimens.

Methods: The morphological changes of vertebral canal and its contents were investigated and measured during experimental flexion, extension, and lateral bending of the cervical spine with 10 fresh specimens (Chinese); the cross-sections and sagittal diameters were also measured by pouring liquid wax into the intervertebral canal.

Results: During lateral bending, the nucleus pulposus was pushed to the opposite side and the inferior cervical nerve roots of the opposite side were stretched. Cross-sectional diameter at the level of C6-7 during flexion was larger than that in lateral bending (P < .05). Comparing extension with flexion, we found that changes in all segments' areas were significant (P < .05). There was no significant difference in the sagittal diameter at any segment during all postures (P > .05).

Conclusions: During lateral bending, the nucleus pulposus of neck were pushed into the opposite side, and inferior cervical nerve roots of the opposite side were stretched. The C5, C6, and C7 nerve roots appeared to undergo excessive stretch when an excessive lateral bending beyond the physiologic range was undergone. This study provides some additional evidence about the mechanics of cervical spine motion.

This abstract is reproduced with the permission of the publisher; full text by subscription. Click on the above link and select a publisher from PubMed's LinkOut feature.
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