Characterization of dynamic three-dimensional strain fields in the canine radius.
Characterization of dynamic three-dimensional strain fields in the canine radius.
复制标题
犬齿半径动态三维应变场的表征。
DOI：
10.1016/s0021-9290(02)00225-7
复制
发表时间：
2002
影响因子：
2.4
通讯作者：
Burr,DavidB
中科院分区：
文献类型：
--
作者：
Coleman,JohnC;Hart,RichardT;Owan,Ichiro;Tankano,Yuichi;Burr,DavidB
本说明描述了一种在正常日常活动期间近似长骨 3D 机械环境的方法。我们的具体目标是表征步态期间犬齿半径中轴区域的时间和空间应变分布。直接测量体内骨骼整个表面的应变是不可行的，因此我们采用实验测量和数值插值技术相结合来近似随时间变化的纵向应变分布。使用标准的体内应变测量技术，我们测量了小跑步态时犬齿半径的九个位置（三个横截面各三个位置，数据来自两只实验动物）的动态应变。然后，利用有限元基函数的 3D 数值插值方案，使用这些体内应变测量来近似整个半径中轴区域的应变场的时间过程。尽管该方法目前的实施存在局限性，但结果表明，沿着骨干长度的不同横截面处发生的应变分布存在相当大的时间依赖性变化，并且在步态周期期间中性轴位置存在显着的前后弯曲和旋转。
This note describes a method to approximate the 3-D mechanical environment of a long bone during a normal daily activity. Our specific goal was to characterize the temporal and spatial strain distributions in the mid-shaft region of the canine radius during gait. Direct measurement of strains along the entire surface of in vivo bone is not feasible, so we employed a combination of experimental measurements and numerical interpolation techniques to approximate the time-varying longitudinal strain distribution. Using standard in vivo strain gauging techniques, we measured dynamic strains at nine locations (three locations on each of three cross sections, data pooled from two experimental animals) on the canine radius during trotting gait. These in vivo strain measurements were then used to approximate the time course of the strain field for the entire radius mid-shaft region using a 3-D numerical interpolation scheme using finite element basis functions. Despite limitations in the present implementation of the method, the results show that there are considerable time-dependent variations in the strain distribution occurring at different transverse sections along the length of the diaphysis with substantial anteroposterior bending and rotation of neutral axis locations during the gait cycle.