System for kinemâtical analysis of the human gait based on videogra

Abstract

Three-dimensional kinematic analysis has been used as an important research method for assessing normal or pathological human gait. However, due to several factors, such analysis is not widespread in Brazil. The aim of this paper is to present results of a three-dimensional kinematic analysis of the human gait by means of a Brazilian videogrammetry system - Dvideow, d e v e l o p e d by the Laboratório de
Instrumentação para Biomecânica at Unicamp, SP. A complete gait cycle
of three female adult subjects with no history of pathologies or gait
complaints was evaluated. The lower limbs and pelvis were tahcen as rigid
bodies articulated by six joints, each representing a body segment. In order to obtain position and space orientation for each body segment, reflexive markers (f=15mm) were fixed onto anatomical landmarkers and in a technical markers system. The ankle, knee and hip joint angles were
analyzed, as well as trie pelvis orientation. Results w e r e evaluateaby means of accuracy tests of the reconstruction of the path described by two markers during the gait; accuracy relative to framing was of 0,2%. Data obtained agree to those described in the literature. It is shown that it is possible to make gait analysis using the Dvideow system, which allows for analysing the ankle joint with three degrees of freedom and for simultaneous visual and quantitative analysis.