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首页> 外文期刊>Journal of Biomechanics >Evidence for IHA migration during axial rotation of a lumbar spine segment by using a novel high-resolution 6D kinematic tracking system
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Evidence for IHA migration during axial rotation of a lumbar spine segment by using a novel high-resolution 6D kinematic tracking system

机译：通过使用新型高分辨率6D运动跟踪系统在腰椎段轴向旋转过程中IHA迁移的证据

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摘要

The biomechanical properties of the lumbar spine have long been studied. However, despite its enormous importance, basic functional and morphological properties have been not well understood and require further experimental analysis since data concerning the spatial instantaneous segmental motions are hardly available. This study describes the theoretical background and the technical properties of an innovative method for tracking the instantaneous 3D motion of human spinal segments in vitro at high spatial resolution. This new acquisition system allows to scrutinise closely the location and alignment of the segmental instantaneous helical axis (IHA) and the respective screw pitch as functions of the absolute rotational angle. The required precision of the measuring device was attained (a) by six highly resolving linear inductive displacement sensors in a special spatially configuration (3-2-1), (b) by a method to apply torque and force independently of each other without counteraction, and (c) by suppression of vibrations. The validity and reliability of the experimental set-up and the numerical method of data analysis were tested by subjects of known mechanical properties. In vitro experiments with a human lumbar segment (L3/L4, autopsy material) demonstrated that (a) the IHA migrated during axial rotation from one segmental articulatio zygapophysialis to the other joint, (b) the IHA tilted medial-laterally, and (c) the pitch of the screw altered linearly as a function of the rotational angle. This phenomenon is traced back to the guidance of the articluationes zygapophysiales. The validation of the method allows to map segments of the entire vertebral column. The results can be used as benchmarks for future models of the human spine. (C) 2003 Elsevier Ltd. All rights reserved. [References: 17]
机译：腰椎的生物力学特性已被长期研究。然而，尽管其极为重要，但由于几乎没有关于空间瞬时节段运动的数据，因此尚未很好地理解基本的功能和形态特性，并且需要进一步的实验分析。这项研究描述了一种创新方法的理论背景和技术特性，该方法可以在高空间分辨率下体外追踪人的脊柱节段的瞬时3D运动。这种新的采集系统允许仔细检查分段瞬时螺旋轴（IHA）的位置和对齐方式以及相应的螺距与绝对旋转角度的关系。 （a）通过六个具有特殊空间配置的高分辨率线性感应式位移传感器（3-2-1）达到了测量设备的所需精度，（b）通过彼此独立施加扭矩和力而不会产生反作用的方法来实现（c）抑制振动。实验装置的有效性和可靠性以及数据分析的数值方法由已知机械性能的受试者进行测试。人体腰节（L3 / L4，尸检材料）的体外实验表明，（a）IHA在轴向旋转过程中从一个节段性关节突physi突迁移至另一个关节，（b）IHA内侧向外侧倾斜，并且（c ）螺丝的螺距随旋转角度呈线性变化。这种现象可以追溯到关节生理学的指导。该方法的验证允许映射整个椎骨柱的片段。结果可以用作未来人体脊柱模型的基准。 （C）2003 Elsevier Ltd.保留所有权利。 [参考：17]

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