Three-dimensional stiffness of the carpal arch.
Three-dimensional stiffness of the carpal arch.
复制标题
腕弓的三维刚度。
DOI：
10.1016/j.jbiomech.2015.11.005
复制
发表时间：
2016
影响因子：
2.4
通讯作者：
Li,Zong-Ming
中科院分区：
文献类型：
--
作者：
Gabra,JosephN;Li,Zong-Ming
手腕的腕弓由不规则形状的腕骨形成，这些腕骨由许多韧带相互连接，导致复杂的结构力学。本研究的目的是使用位移扰动来确定腕弓的三维刚度特性。据推测，腕弓将表现出各向异性的刚度行为，其主方向与传统的解剖轴倾斜。本研究中使用了8具（n=8）尸体。对于每个标本，将钩骨固定在定制的固定装置上。一个仪器化的机器人手臂施加三维位移扰动的脊和相应的反作用力收集。位移-力数据用于使用最小二乘拟合确定三维刚度矩阵。通过对刚度矩阵进行特征分解，确定了各主刚度分量的大小和方向。腕弓结构表现出各向异性刚度行为，最大主刚度为16.4±4.6 N/mm，显著大于其他主成分3.1±0.9和2.6±0.5 N/mm（p<0.001）。最大刚度的主要方向是旋前的横截面内的腕管，这是占由刚性的横向韧带，紧密结合远端腕弓。最小的主刚度是由于较少的约束关节之间的骨和舟骨。这项研究提供了先进的表征手腕骨的三维结构刚度，以提高洞察手腕生物力学，稳定性和功能。
The carpal arch of the wrist is formed by irregularly shaped carpal bones interconnected by numerous ligaments, resulting in complex structural mechanics. The purpose of this study was to determine the three-dimensional stiffness characteristics of the carpal arch using displacement perturbations. It was hypothesized that the carpal arch would exhibit an anisotropic stiffness behavior with principal directions that are oblique to the conventional anatomical axes. Eight (n=8) cadavers were used in this study. For each specimen, the hamate was fixed to a custom stationary apparatus. An instrumented robot arm applied three-dimensional displacement perturbations to the ridge of trapezium and corresponding reaction forces were collected. The displacement–force data were used to determine a three-dimensional stiffness matrix using least squares fitting. Eigendecomposition of the stiffness matrix was used to identify the magnitudes and directions of the principal stiffness components. The carpal arch structure exhibited anisotropic stiffness behaviors with a maximum principal stiffness of 16.4±4.6 N/mm that was significantly larger than the other principal components of 3.1±0.9 and 2.6±0.5 N/mm (p<0.001). The principal direction of the maximum stiffness was pronated within the cross section of the carpal tunnel which is accounted for by the stiff transverse ligaments that tightly bind distal carpal arch. The minimal principal stiffness is attributed to the less constraining articulation between the trapezium and scaphoid. This study provides advanced characterization of the wrist׳s three-dimensional structural stiffness for improved insight into wrist biomechanics, stability, and function.