Dynamic sagittal flexibility coefficients of the human cervical spine.
Dynamic sagittal flexibility coefficients of the human cervical spine.
复制标题
人体颈椎动态矢状柔韧性系数。
DOI：
10.1016/j.aap.2006.10.015
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
Panjabi,ManoharM
中科院分区：
文献类型：
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作者：
Ivancic,PaulC;Ito,Shigeki;Panjabi,ManoharM
本研究的目的是确定动态矢状面柔韧性系数，包括耦合系数，整个人类颈椎使用后部撞击。一个具有肌肉力复制和替代头的生物椎体全颈椎模型（n=6）在台式迷你雪橇中以T1椎体的5g峰值水平加速度后侧撞击。计算每个脊柱节段、头/C1至C7/T1的动态主矢状面弹性系数和耦合矢状面弹性系数。全颈椎的平均柔韧性系数比较有统计学意义（p<0.05）。为了验证这些系数，将利用平均柔度矩阵和实测荷载矢量得到的平均计算位移峰值与实测位移峰值进行统计比较。计算得到的位移峰值与实测的位移峰值总体上吻合较好，从而验证了计算得到的柔度系数。除了头部/C1的伸展旋转和C7/T1的后切变平移外，这些峰没有统计学上的区别。头/C1明显比其他脊柱节段更灵活。与轴向压缩相比，颈椎在后路剪切时通常更灵活。耦合系数表明，延伸力矩引起后剪力的耦合平移，后剪力引起延伸转动的耦合。本研究结果可用于设计人体测量试验假人和数学模型，以更好地模拟颈椎在动态载荷下的反应。
The goal of the present study was to determine the dynamic sagittal flexibility coefficients, including coupling coefficients, throughout the human cervical spine using rear impacts. A biofidelic whole cervical spine model (n=6) with muscle force replication and surrogate head was rear impacted at 5g peak horizontal accelerations of the T1 vertebra within a bench-top mini-sled. The dynamic main and coupling sagittal flexibility coefficients were calculated at each spinal level, head/C1 to C7/T1. The average flexibility coefficients were statistically compared (p<0.05) throughout the cervical spine. To validate the coefficients, the average computed displacement peaks, obtained using the average flexibility matrices and the measured load vectors, were statistically compared to the measured displacement peaks. The computed and measured displacement peaks showed good overall agreement, thus validating the computed flexibility coefficients. These peaks could not be statistically differentiated, with the exception of extension rotation at head/C1 and posterior shear translation at C7/T1. Head/C1 was significantly more flexible than all other spinal levels. The cervical spine was generally more flexible in posterior shear, as compared to axial compression. The coupling coefficients indicated that extension moment caused coupled posterior shear translation while posterior shear force caused coupled extension rotation. The present results may be used towards the designs of anthropometric test dummies and mathematical models that better simulate the cervical spine response during dynamic loading.