Quantitative estimation of foot-flat and stance phase of gait using foot-worn inertial sensors

摘要: Time periods composing stance phase of gait can be clinically meaningful parameters to reveal differences between normal and pathological gait. This study aimed, first, describe a novel method for detecting inner-stance temporal events based on foot-worn inertial sensors; second, extract validate relevant metrics from those events; third, investigate their suitability as clinical outcome evaluations. 42 subjects including healthy patients before after surgical treatments ankle osteoarthritis performed 50-m walking trials while wearing sensors pressure insoles reference system. Several hypotheses were evaluated detect heel-strike, toe-strike, heel-off, toe-off kinematic features. Detected compared with the system 3193 cycles showed good accuracy precision. Absolute relative periods, namely loading response, foot-flat, push-off then estimated, validated, statistically populations. Besides significant observed in duration, analysis revealed differing tendencies notably shorter foot-flat subjects. The result indicated which features sensors' signals should preferred precisely accurately against standard. is suitable evaluations provides beyond common swing/stance decomposition, through quantitative estimation phases such foot-flat. (C) 2012 Elsevier B.V. All rights reserved.