Quantification of loading in biomechanical testing: the influence of dissection sequence
Quantification of loading in biomechanical testing: the influence of dissection sequence
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DOI：
10.1016/j.jbiomech.2015.06.020
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发表时间：
2015-09-18
影响因子：
2.4
通讯作者：
Kawchuk, Gregory N.
中科院分区：
文献类型：
--
作者：
Funabashi, Martha;El-Rich, Marwan;Kawchuk, Gregory N.
连续解剖是一种用于研究关节组织所承受载荷的技术。当以无约束方式测试感兴趣关节时，其运动学随每次组织切除而变化。为了解决这个限制，足够刚性的机器人被用来约束关节运动学。虽然这种方法可以量化每个组织所承受的载荷，但当移除顺序改变时，它不能确保类似的结果。具体而言，如果结构表现为线性（即叠加原理适用），则假定结构载荷与移除顺序无关，但当响应受材料和/或几何非线性和/或粘弹性（例如生物组织）影响时，则取决于移除顺序。因此，进行本实验以评价通过机器人测试产生的结构载荷是否取决于连接器的移除顺序。六个相同的模型是3D打印的。每个模型由2个刚体和3个连接结构组成，具有非线性时变特性。对于这些模型，使用并联机器人对预定义的静态旋转中心施加纯旋转。六个模型中的每一个都使用了独特的解剖序列，并且在每次解剖后自动应用相同的运动。当比较不同切除序列之间每个结构所经历的力矩时，观察到统计学显著差异（p < 0.05）。这些结果表明，即使在一个优化的环境中，非线性粘弹性结构被删除的顺序影响模型加载。这些发现支持先前的工作，表明从机器人测试中获得的组织负载特定于取出顺序。(C)2015爱思唯尔有限公司版权所有。
Sequential dissection is a technique used to investigate loads experienced by articular tissues. When the joint of interest is tested in an unconstrained manner, its kinematics change with each tissue removal. To address this limitation, sufficiently rigid robots are used to constrain joint kinematics. While this approach can quantify loads experienced by each tissue, it does not assure similar results when removal order is changed. Specifically, structure loading is assumed to be independent of removal order if the structure behaves linearly (i.e. principle of superposition applies), but dependent on removal order when response is affected by material and/or geometry nonlinearities and/or viscoelasticiy (e.g. biological tissues). Therefore, this experiment was conducted to evaluate if structure loading created through robotic testing is dependent on the order in which connectors are removed. Six identical models were 3D printed. Each model was composed of 2 rigid bodies and 3 connecting structures with nonlinear time-dependent behavior. To these models, pure rotations were applied about a predefined static center of rotation using a parallel robot. A unique dissection sequence was used for each of the six models and the same movements applied robotically after each dissection. When comparing the moments experienced by each structure between different removal sequences, a statistically significant difference (p < 0.05) was observed. These results suggest that even in an optimized.environment, the sequence in which nonlinear viscoelastic structures are removed influence model loading. These findings support prior work suggesting that tissue loads obtained from robotic testing are specific to removal order. (C) 2015 Elsevier Ltd. All rights reserved.