Influence of varying compressive loading methods on physiologic motion patterns in the cervical spine
Influence of varying compressive loading methods on physiologic motion patterns in the cervical spine
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DOI：
10.1016/j.jbiomech.2015.11.045
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发表时间：
2016-01-25
影响因子：
2.4
通讯作者：
Tashman, Scott
中科院分区：
文献类型：
--
作者：
Bell, Kevin M.;Yan, Yiguo;Tashman, Scott
人类颈椎在体内承受由肌肉力量和头部重量产生的大量压缩负荷。然而，传统的体外测试方法很少包括压缩载荷，特别是在多节段颈椎结构的研究中。文献中报道了各种模拟生理负载的方法，包括倾斜负载板产生的轴向力、偏心轴向力应用、随动负载，以及在体外单独应用/模拟肌肉力的尝试。之前的研究已经强调了适当的压缩载荷对于重建体内表现出的节段运动模式的重要性。然而，目前尚不清楚表示头部重量和肌肉载荷的适当方法。因此，对无压缩载荷的标准纯力矩与已发表的新型压缩载荷技术（从动载荷 - FL、轴向载荷 - AL 和组合载荷 - CL）进行了系统比较。本研究的独特之处在于，通过持续的机构内合作，可以在整个伸展到屈曲运动路径上与连续颈椎运动学进行直接比较。没有压缩或施加从动件负载的纯力矩测试协议无法在整个运动路径中复制典型的体内分段运动模式。轴向载荷或轴向载荷和从动载荷的组合对于模拟伸展-屈曲运动路径极端处的体内节段贡献是必要的。假设动态改变整个运动路径中的压缩载荷对于模拟体内表现出的分段贡献模式是必要的。由爱思唯尔有限公司出版
The human cervical spine supports substantial compressive load in-vivo arising from muscle forces and the weight of the head. However, the traditional in-vitro testing methods rarely include compressive loads, especially in investigations of multi-segment cervical spine constructs. Various methods of modeling physiologic loading have been reported in the literature including axial forces produced with inclined loading plates, eccentric axial force application, follower load, as well as attempts to individually apply/model muscle forces in-vitro. The importance of proper compressive loading to recreate the segmental motion patterns exhibited in-vivo has been highlighted in previous studies. However, appropriate methods of representing the weight of head and muscle loading are currently unknown.Therefore, a systematic comparison of standard pure moment with no compressive loading versus published and novel compressive loading techniques (follower load - FL, axial load - AL, and combined load- CL) was performed. The present study is unique in that a direct comparison to continuous cervical kinematics over the entire extension to flexion motion path was possible through an ongoing intra-institutional collaboration. The pure moment testing protocol without compression or with the application of follower load was not able to replicate the typical in-vivo segmental motion patterns throughout the entire motion path. Axial load or a combination of axial and follower load was necessary to mimic the in-vivo segmental contributions at the extremes of the extension-flexion motion path. It is hypothesized that dynamically altering the compressive loading throughout the motion path is necessary to mimic the segmental contribution patterns exhibited in-vivo. Published by Elsevier Ltd.