Functional analysis of the hand index and thumb during various tasks.

摘要

This research of the hand index finger focuses on objectively recording movements and finding the tendon forces at the distal interphalangeal (DIP) and proximal interphalangeal (PIP) joints. Experiments were performed to shed light on the complex dynamics of the joints on the index finger; and a simulation model was formulated. An inverse dynamics approach was used to avail the resultant forces contributed by FDP, FDS and other tendons. The course of research presented here enriched the understanding of the hand index finger; a deeper understanding of the workings of the human hand may also increase the effectiveness of current treatments for hand injuries.;The experimental portion of this research was a combination of data acquisition, data processing, and model simulation. For the purposes of gathering objective data, an index finger angular displacement measuring system was designed, constructed, and tested. The MATLAB software package was used to process the acquire data. The interactive motion simulation software package ADAMS was used to estimate the FDP and FDS forces by an inverse dynamics approach.;Inverse dynamics is the other cornerstone for this research. It is a method for computing forces and/or moments of force based on the motion of a body and the body's inertial properties. Inverse dynamics derives the minimum forces and moments responsible for the individual movements. In this research, an inverse dynamics method was applied to obtain the resultant forces on index joints based on measured movements of the index finger.;The acquired pulling forces around the DIP, PIP and MCP joints do not have a lot of meaning anatomically since there are not one dedicated tendons for each mentioned joints. The three pulling forces. Fdip, Fpip and Fmcp can be utilized to derive the forces exerted by two tendons FDP, FDS and other tendons. A simple relation set has been obtained.;There are graphical representations of the FDP, FDX and other tendons' pulling forces in the processes of the flexion/extension, the tip pinching, and the bottle grabbing in the index finger. Through these graphs, some observations and conclusions have been obtained.