VARIATION OF LUMBAR SPINE STIFFNESS WITH LOAD
VARIATION OF LUMBAR SPINE STIFFNESS WITH LOAD
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DOI：
10.1115/1.3138639
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发表时间：
1987-02-01
影响因子：
1.7
通讯作者：
MANN, RW
中科院分区：
文献类型：
--
作者：
EDWARDS, WT;HAYES, WC;MANN, RW
体外对功能脊柱单位(FSU)的力学研究表明，载荷-位移曲线的斜率随载荷的增加而增大。这种非线性意味着FSU的刚度在生理载荷范围内不是恒定的，并且通过施加单个载荷获得的FSU试件的测量结果不能相加来预测试件对组合载荷的响应。为了更好地量化FSU试件的非线性载荷-位移响应，并计算FSU试件在反映体内条件的载荷组合状态下的耦合刚度，本研究发展了实验和分析方法。参考椎体中心的结果表明，腰椎FSU标本在屈曲时比在伸展时僵硬，而在屈曲时，FSU标本在高载荷下比在低载荷下僵硬。论证了联合载荷试验和载荷-位移数据的非线性解释的重要性。
Mechanical studies of the Functional Spinal Unit (FSU) in-vitro have shown that the slopes of the load-displacement curves increase with load. This nonlinearity implies that the stiffness of the FSU is not constant over the range of physiologic loads, and that measurements obtained for FSU specimens through the application of individual loads cannot be summed to predict the response of the specimens to combined loads. Both experimental and analytical methods were developed in the present study to better quantify the nonlinear FSU load-displacement response and to calculate the coupled stiffness of FSU specimens at combined states of load reflecting in-vivo conditions. Results referenced to the center of the vertebral body indicate that lumbar FSU specimens are stiffer in flexion than in extension, and that FSU specimens loaded in flexion are stiffer at high loads than at low loads. The importance of combined load testing and a nonlinear interpretation of load-displacement data is demonstrated.