Algorithm to estimate the knee angle in normal gait: trajectory generation approach to intelligent transfemoral prosthesis

  • F. Martínez-Solís División Académica de Ingeniería y Arquitectura, Universidad Juárez Autónoma de Tabasco
  • R. Ramírez-Betancour División Académica de Ingeniería y Arquitectura, Universidad Juárez Autónoma de Tabasco
  • A. Olmos-López División Académica de Ingeniería y Arquitectura, Universidad Juárez Autónoma de Tabasco
  • J. M. Rodríguez-Lelis Tecnológico Nacional de México
  • A. Claudio-Sánchez Tecnológico Nacional de México
  • B. González-Contreras Universidad Autónoma de Tlaxcala.
Keywords: gait analysis, linear regression, estimate angle, intelligent prosthesis

Abstract

 

This paper presents an algorithm to estimate the knee angle from hip angle and gait parameters. This algorithm uses a single sensor on the thigh to achieve the estimation. Hip-knee natural correlations were employed in order to analyze the gait flexion-extension movements in two stages: 1) when the foot is not in full contact with the floor (swing phase and heel contact); 2) when the whole sole makes contact with the ground (stance phase). The estimation is developed in real-time for gait movements and speed fluctuations do not distort the angle estimated. In addition, the simple linear regression was used to approximate the estimated angle to actual knee angle. The experimental results obtained from the gait studies, showed an acceptable knee angle approximation; the mean error estimation was 8.25∘. The major goal of this work was the development of an algorithm that can solve the problem of human body-intelligent transfemoral prosthesis coordination, even if there are gait speed fluctuations.

 

Author Biographies

F. Martínez-Solís, División Académica de Ingeniería y Arquitectura, Universidad Juárez Autónoma de Tabasco

R. Ramírez-Betancour, División Académica de Ingeniería y Arquitectura, Universidad Juárez Autónoma de Tabasco

A. Olmos-López, División Académica de Ingeniería y Arquitectura, Universidad Juárez Autónoma de Tabasco

J. M. Rodríguez-Lelis, Tecnológico Nacional de México

A. Claudio-Sánchez, Tecnológico Nacional de México

B. González-Contreras, Universidad Autónoma de Tlaxcala.

Published
2016-09-15
How to Cite
Martínez-Solís, F., Ramírez-Betancour, R., Olmos-López, A., Rodríguez-Lelis, J. M., Claudio-Sánchez, A., & González-Contreras, B. (2016). Algorithm to estimate the knee angle in normal gait: trajectory generation approach to intelligent transfemoral prosthesis. Mexican Journal of Biomedical Engineering, 37(3), 221-233. https://doi.org/10.17488/RMIB.37.3.7
Section
Research Articles