Investigation of optimal follower load path generated by trunk muscle coordination
Investigation of optimal follower load path generated by trunk muscle coordination
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DOI：
10.1016/j.jbiomech.2011.03.010
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发表时间：
2011-05-17
影响因子：
2.4
通讯作者：
Lee, SuKyoung
中科院分区：
文献类型：
--
作者：
Kim, Kyungsoo;Kim, Yoon Hyuk;Lee, SuKyoung
据报道，每个椎体的旋转中心位于椎体中心的后方。此外，有人建议，优化的从动载荷（FL）作用于椎体中心后方。然而，关于脊柱稳定的典型生物力学特征，如关节压力、剪切力、关节力矩和肌肉应力，FL的最佳位置尚未研究。每个椎骨的旋转中心的变化，制定了一个三维有限元模型的腰椎与117对躯干肌肉。然后，通过求解同时最小化压缩力、剪切力和关节力矩或最小化立方肌肉应力的优化问题来估计连接旋转中心的FL路径的最佳平移。考虑了直立中立站立位和双手200 N的站立位。FL路径向后移动，与优化标准和载荷条件无关。对于每种优化方案，在直立站立时FL路径向后移动5.0和7.8 mm，在站立时以200 N的手向后移动4.1 mm和7.0 mm。此外，最佳FL路径可能比身体中心FL路径具有优势。本技术对于理解躯干肌肉的脊柱稳定功能可能是重要的。(C)2011爱思唯尔有限公司保留所有权利。
It has been reported that the center of rotation of each vertebral body is located posterior to the vertebral body center. Moreover, it has been suggested that an optimized follower load (FL) acts posterior to the vertebral body center. However, the optimal position of the FL with respect to typical biomechanical characteristics regarding spinal stabilization, such as joint compressive force, shear force, joint moment, and muscle stress, has not been studied. A variation in the center of rotation of each vertebra was formulated in a three-dimensional finite element model of the lumbar spine with 117 pairs of trunk muscles. Then, the optimal translation of the FL path connecting the centers of rotations was estimated by solving the optimization problem that was to simultaneously minimize the compressive forces, the shear forces, and the joint moments or to minimize the cubic muscle stresses. An upright neutral standing position and a standing position with 200 N in both hands were considered. The FL path moved posterior, regardless of the optimization criteria and loading conditions. The FL path moved 5.0 and 7.8 mm posterior in upright standing and 4.1 mm and 7.0 mm posterior in standing with 200 N in hands for each optimization scheme. In addition, it was presented that the optimal FL path may have advantages in comparison to the body center FL path. The present techniques may be important in understanding the spine stabilization function of the trunk muscles. (C) 2011 Elsevier Ltd. All rights reserved.