Volume 14, Number 4 (Winter 2014)                   Vol. , No. , Season & Year , Serial No. | Back to browse issues page

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Safaei-Pour Z, Esteki A, Tabatabaei-Ghomsheh F, Mousavi S M E. Analysis of the Ankle Moment-Angle Curve in Different Gait Speeds and Phases for Designing Ankle-Foot Prosthesis. Archives of Rehabilitation. 2014; 14 (4) :90-98
URL: http://rehabilitationj.uswr.ac.ir/article-1-1277-en.html

1- 1- Ph.D. in Biomedical Engineering-Biomechanics Department of Biomedical Engineering, Science & Research Branch, Islamic Azad University (IAU), Tehran, Iran. , safaee_zahra@yahoo.com
2- Professor Department of Biomedical Engineering and Physics, Shahid Beheshti University of Medical Sciences, Tehran, Iran
3- Associate Professor Department of Ergonomics, University of Social Welfare and Rehabilitation Science, Tehran, Iran
4- Associate Professor Department of Prosthetics and Orthotics, University of Social Welfare and Rehabilitation Science, Tehran, Iran
Abstract:   (3763 Views)

Objective: Aim of this study was to analysis the ankle moment-angle relation and its characteristics at different gait speeds and phases for using in prosthetic ankle-foot design.

Materials & Methods: This was a cross-sectional analytic study in which 20 participants were chosen with assessable sampling method. Gait analysis at different speeds was performed with two force-plates and five high speed cameras. Ankle characteristics including quasi-stiffness and work were estimated at three periods of stance phase based on moment-angle loop. Mean differences were analyzed with repeated measure ANOVA and regression analysis was performed to fit the linear model to the data.

Results: Moment-angle curve was clockwise at slower speeds and turned counter-clockwise while speed increased. The best fitted line to the work-walking speed curve had R2=0.81. There were significant differences in quasi-stiffness between fast and normal speed and slower speeds (P<0.001).

Conclusion: Moment-angle curve displayed ankle passive function in slower speeds and active function in faster speeds. Results showed ankle characteristics varied at different gait phases and speeds. Thus, at slower speeds a spring-damper model with regulable damping would simulate the ankle function. However, at higher speeds the active elements also should be considered.

Full-Text [PDF 457 kb]   (561 Downloads)    
Type of Study: Original | Subject: General
Received: 13/04/2013 | Accepted: 12/08/2013 | Published: 15/06/2014

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