Li-Ping Wu, Yi-Kai Li, Bo-Jin Liang, Das Manas, Ji-Hong Fan
Department of Orthopedics, Guangzhou Liu Hua Qiao Hospital, Guangzhou, China.
J Manipulative Physiol Ther. 2010 Feb;33(2):132-7. doi: 10.1016/j.jmpt.2009.12.003.
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.
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.
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).
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.
本研究旨在对尸体标本颈椎在体外进行前屈、后伸和侧屈时椎管及其铸型形态的变化进行研究和测量。
用10个新鲜标本（中国人）对颈椎进行实验性前屈、后伸和侧屈时，对椎管及其内容物的形态变化进行研究和测量；还通过向椎间管内注入液体蜡来测量横截面积和矢状径。
侧屈时，髓核被推向对侧，对侧下颈神经根被拉伸。前屈时C6 - 7水平的横截面积大于侧屈时（P < .05）。将后伸与前屈相比较，我们发现所有节段面积的变化均有显著性差异（P < .05）。所有体位下任何节段的矢状径均无显著差异（P > .05）。
侧屈时，颈部髓核被推向对侧，对侧下颈神经根被拉伸。当进行超过生理范围的过度侧屈时，C5、C6和C7神经根似乎会受到过度拉伸。本研究为颈椎运动力学提供了一些额外的证据。
