Iranian Journal of Biomedical Engineering (IJBME)
نشریه علمی مهندسی پزشکی زیستی

Motion Reconstruction and Error Analysis for Human Planar Motions using at least One Freely-Placed Passive Marker per Segment

Document Type : Full Research Paper

Authors

Fatemeh Akbarifar 1
Mohammad Hadi Honarvar 2
Mostafa Haj Lotfalian 3

1 M.Sc. Student, Faculty of Mechanical Engineering, Yazd University, Yazd, Iran

2 Assistant Professor, Faculty of Mechanical Engineering / Center of Excellence for Support Systems in Health Development, Yazd University, Yazd, Iran

3 Ph.D., Center of Excellence for Support Systems in Health Development, Yazd University, Yazd, Iran

https://doi.org/10.22041/ijbme.2021.128760.1599
Abstract
Finding the center of rotation (COR) is needed for defining the anatomical axis of the skeletal system and for the kinematic calculation of joints in biomechanical studies. For this purpose, predictive and functional methods can be used. In the predictive methods, regression equations obtained from anthropometric measurements are used, and in the functional methods, the relative motion of the two adjacent segments is used to find COR. The purpose of this study is to formulate the circle fitting algorithm as a functional method with two analytical and optimization solutions. In order to evaluate the algorithm, error analysis was performed by both analytical and numerical methods. Also, effective factors in error estimating of COR position such as standard deviation of measurement system error (σ), rotation angle (α) and the distance between marker and COR (r), was evaluated. The results showed a high correlation (r=0.99) between analytical and numerical solution, which proved the accuracy of the error analysis. In this study, optimization method according to the accuracy of better estimates in low quantities α, less influence on high quantities σ and high speed in problem solving, can be taken into consideration to reconstruct human movements in biomechanical studies. Use of functional methods, eliminates the need for attaching markers to anatomical landmarks and provides a new development in motion data acquisition.

Keywords

Motion Reconstruction
Center of Rotation
Circle Fitting
Error Expectation Analysis

Subjects

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Iranian Journal of Biomedical Engineering (IJBME)
Volume 15, Issue 1
Spring 2021
Pages 1-11

  • Receive Date 07 June 2020
  • Revise Date 05 February 2021
  • Accept Date 15 April 2021

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