THREE DIMENSIONAL GAIT ANALYSIS
Date
1980-10
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
ORCID
Type
Degree Level
Masters
Abstract
Until recently most motion analysis that was not performed in real time has been conducted using cine cameras. Only a few years ago automatic TV tracking systems were introduced. These have the advantage that the video image can be digitized automatically. Both methods, however, are rather elaborate, making motion analysis in smaller institutions very difficult.
This thesis presents a novel data acquisition system for motion analysis in two or three dimensions. Emphasis is placed on a relatively simple method of the data collection requiring minimal equipment. The system consists of an ordinary 35 mm camera (one camera for two dimensions or two cameras for analysis in three dimensions), infrared light emitting diodes (LED's) used as markers, and an electronic control circuit.
Software for the analysis of the gait data was written in FORTRAN. The programs include the calculation of the knee and ankle joint angles, location of the instantaneous knee joint center, acceleration of the body markers and center of mass locations, reaction forces within joints and under the feet, and the total moments around joints. The programs are written for three dimensional analysis (analysis in two dimensions is optional), and can be used for the analysis of data gathered by other instrumentation such as cine or TV as well. The accuracy of the results gathered with the data collecting system described in this thesis is comparable with that obtained using cine camera methods. The implementation of the third dimension, however, allows looking into more aspects of gait than with a two dimensional analysis only.
Description
Keywords
Citation
Degree
Master of Science (M.Sc.)
Department
Electrical Engineering