Laboratoire de Biomécanique de l'ENSAM, Paris, France.
Eur Spine J. 1993 Jun;2(1):2-11. doi: 10.1007/BF00301048.
Our aim was to determine the biomechanical properties of the normal human cervical spine under physiological static loads. The three-dimensional displacements under three pure moments: flexion-extension, left-right lateral bending and left-right axial torsion--were measured in 56 intact functional spinal units (FSUs) taken from between C2 and C7 in 29 human cadavers. For each mode of loading, load-displacement curves were plotted. Then we calculated each neutral zone, range of motion, neutral zone ratio, ratio of coupled motion, limit moment and secant stiffness. The effects of intervertebral disc degeneration and the disc level were also taken into account by the analysis of variance. Our results adequately demonstrated both the non-linearity of load-displacement curves and the neutral zone of the cervical spine in three-dimensional space. At the same time, we found statistically that the stiffness in the three planes are significantly different, as are the stiffnesses in lateral bending of successive different FSUs. However, significant differences of stiffness in different states of disc degeneration were only found in right lateral bending. There were significant differences between levels in ratio of coupled motion under both lateral bending and axial torsion. The loading cycle conditions and the biomechanical responses of principal motion of C1-2 are also reported.
我们的目的是确定正常人体颈椎在生理静态负荷下的生物力学特性。在 29 具人体尸体的 C2 至 C7 之间的 56 个完整功能脊柱单位（FSU）中，测量了在三个纯力矩下（屈伸、左右侧屈和左右轴向扭转）的三维位移。对于每种加载模式，绘制了载荷-位移曲线。然后我们计算了每个中立区、运动范围、中立区比、耦合运动比、极限力矩和割线刚度。通过方差分析，还考虑了椎间盘退变和椎间盘水平的影响。我们的结果充分证明了颈椎在三维空间中的载荷-位移曲线的非线性和中立区。同时，我们发现，三个平面的刚度以及连续不同的 FSU 侧屈的刚度具有统计学差异。然而，只有在右侧侧屈时，椎间盘退变的不同状态下的刚度才有显著差异。在左右侧屈和轴向扭转下，不同水平的耦合运动比也有显著差异。还报告了 C1-2 的主要运动的加载循环条件和生物力学响应。
