Spinal stability and role of passive stiffness in dynamic squat and stoop lifts

被引：32
作者：
Division of Applied Mechanics, Department of Mechanical Engineering, École Polytechnique, Montreal, QC, H3C 3A7, Canada [1 ]
机构：
[1] Division of Applied Mechanics, Department of Mechanical Engineering, École Polytechnique, Montreal, QC
来源：
Comput. Methods Biomech. Biomed. Eng. | 2007年 / 5卷 / 351-360期
基金：
加拿大自然科学与工程研究理事会;
关键词：
Dynamic lifting; Finite element; Kinematics; Muscle force; Passive stiffness; Stability;
D O I：
10.1080/10255840701436974
中图分类号：
学科分类号：
摘要：
The spinal stability and passive-active load partitioning under dynamic squat and stoop lifts were investigated as the ligamentous stiffness in flexion was altered. Measured in vivo kinematics of subjects lifting 180N at either squat or stoop technique was prescribed in a nonlinear transient finite element model of the spine. The Kinematics-driven approach was utilized for temporal estimation of muscle forces, internal spinal loads and system stability. The finite element model accounted for nonlinear properties of the ligamentous spine, wrapping of thoracic extensor muscles and trunk dynamic characteristics while subject to measured kinematics and gravity/external loads. Alterations in passive properties of spine substantially influenced muscle forces, spinal loads and system stability in both lifting techniques, though more so in stoop than in squat. The squat technique is advocated for resulting in smaller spinal loads. Stability of spine in the sagittal plane substantially improved with greater passive properties, trunk flexion and load. Simulation of global extensor muscles with curved rather than straight courses considerably diminished loads on spine and increased stability throughout the task. © 2007 Taylor & Francis.
引用
收藏
页码：351 / 360
页数：9
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