Experimental evaluation of accuracy and repeatability of a novel body-to-sensor calibration procedure for inertial sensor-based gait analysis

Eduardo Palermo, Stefano Rossi, Francesca Marini, Fabrizio Patanè, Paolo Cappa

Research output: Contribution to journalArticlepeer-review

Abstract

This paper describes a novel functional body-to-sensor calibration procedure for inertial sensor-based gait analysis. The procedure is designed to be easily and autonomously performable by the subject, without the need for precise sensor positioning, or the performance of specific movements. The procedure consists in measuring the vertical axis during two static positions, and is not affected by magnetic field distortion. The procedure has been validated on ten healthy subjects using an optoelectronic system to measure the actual body-to-sensor rotation matrices. The effects of different sensor positions on each body segment, or different levels of subject inclination during the second static position of the procedure, resulted unnoticeable. The procedure showed accuracy and repeatability values less than 4° for each angle except for the ankle int-external rotation (9.7°, 7.2°). The results demonstrate the validity of the procedure, since they are comparable with those reported for the most-adopted protocols in gait analysis.

Original languageEnglish
Pages (from-to)145-155
Number of pages11
JournalMeasurement: Journal of the International Measurement Confederation
Volume52
Issue number1
DOIs
Publication statusPublished - Jun 2014

Keywords

  • Anatomical calibration
  • Gait analysis
  • IMU/MIMU
  • Inertial sensors
  • Joint angular kinematics

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Applied Mathematics

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