The equivalence of multi-axis spine systems: Recommended stiffness limits using a standardized testing protocol
The equivalence of multi-axis spine systems: Recommended stiffness limits using a standardized testing protocol
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DOI：
10.1016/j.jbiomech.2017.09.010
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发表时间：
2018-03-21
影响因子：
2.4
通讯作者：
Costi, John J.
中科院分区：
文献类型：
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作者：
Holsgrove, Timothy P.;Amin, Dhara B.;Costi, John J.
多轴脊柱测试的复杂性通常使得比较不同研究的结果具有挑战性。这项工作的目的是开发和实施一个标准化的测试协议，在三个六轴脊柱系统，比较他们，并提供刚度和相位角限制，根据其他测试系统可以进行比较。标准化合成腰椎样本（n = 5），包括在每一端嵌入聚合物的三个弹簧，使用屈曲-伸展、侧弯和轴向旋转中的纯力矩对每个系统进行测试。使用振幅为8 Nm、频率为0.1 Hz、轴向预载荷为0和500 N的正弦波和三角波进行试验。在每个样本的中心计算主轴上的刚度、相位角和抗旋转力矩的R-2值。采用跟踪误差作为每个测试系统的测量，以最大限度地减少非主载荷，定义为实际载荷和目标载荷之间的均方根差。所有三个测试系统表现出相似的刚度，小（
The complexity of multi-axis spine testing often makes it challenging to compare results from different studies. The aim of this work was to develop and implement a standardized testing protocol across three six-axis spine systems, compare them, and provide stiffness and phase angle limits against which other test systems can be compared. Standardized synthetic lumbar specimens (n = 5), comprising three springs embedded in polymer at each end, were tested on each system using pure moments in flexion-extension, lateral bending, and axial rotation. Tests were performed using sine and triangle waves with an amplitude of 8 Nm, a frequency of 0.1 Hz, and with axial preloads of 0 and 500 N. The stiffness, phase angle, and R-2 value of the moment against rotation in the principal axis were calculated at the center of each specimen. The tracking error was adopted as a measure of each test system to minimize non principal loads, defined as the root mean squared difference between actual and target loads. All three test systems demonstrated similar stiffnesses, with small (