Li Z M, Zatsiorsky V M, Latash M L
Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA.
Clin Biomech (Bristol). 2000 Mar;15(3):203-11. doi: 10.1016/s0268-0033(99)00058-3.
The purpose of this current work is to develop a method of estimating force produced by the extrinsic and intrinsic hand muscles, and to estimate the contribution of these muscles to the finger joint moments.
Experimental methods and a biomechanical model were developed for the estimation of (a) moments produced at finger joints, and (b) contribution of the intrinsic and extrinsic muscles to the moments, (c) forces of the extrinsic and intrinsic muscles within individual fingers.
Because of the differential insertions of the extrinsic flexors, it is possible to isolate their mechanical effect at finger joints.
During the experiment, the location of force application was varied in parallel along individual fingers. The points of force application were on the distal phalanx, at the distal interphalangeal joint, or at the proximal interphalangeal joint.
When the point of force application was varied in the proximal direction from the distal phalanx to the proximal interphalangeal joint the moment at a given joint decreased. The intrinsic and extrinsic muscle forces were dependent on the experimental conditions. The extrinsic muscles were the major contributors in counterbalancing finger joint moments when the point of force application was distal beyond the proximal interphalangeal joint.
This current work provides both an experimental protocol and a biomechanical model that allows estimation of the contribution of the intrinsic and extrinsic muscles to finger joint moments.
This study suggests ways of identifying the source of functional deficiency in the hand.
当前这项工作的目的是开发一种估计手部外在和内在肌肉产生的力的方法，并估计这些肌肉对手指关节力矩的贡献。
开发了实验方法和生物力学模型，用于估计（a）手指关节处产生的力矩，（b）内在和外在肌肉对力矩的贡献，（c）单个手指内外在和内在肌肉的力。
由于外在屈肌的不同附着点，有可能分离它们在手指关节处的力学效应。
在实验过程中，沿着单个手指平行改变力的施加位置。力的施加点在远节指骨、远侧指间关节或近侧指间关节处。
当力的施加点从远节指骨向近端方向变化到近侧指间关节时，给定关节处的力矩减小。内在和外在肌肉力取决于实验条件。当力的施加点在近端指间关节远端时，外在肌肉是平衡手指关节力矩的主要贡献者。
当前这项工作提供了一种实验方案和一个生物力学模型，可用于估计内在和外在肌肉对手指关节力矩的贡献。
本研究提出了识别手部功能缺陷来源的方法。
