Technical note: Validation of a motion analysis system for measuring the relative motion of the intermediate component of a tripolar total hip arthroplasty prosthesis

Qingshan Chen, Jean Yves Lazennec, Olivier Guyen, Amy Kinbrum, Daniel J. Berry, Kai Nan An

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Tripolar total hip arthroplasty (THA) prosthesis had been suggested as a method to reduce the occurrence of hip dislocation and microseparation. Precisely measuring the motion of the intermediate component in vitro would provide fundamental knowledge for understanding its mechanism. The present study validates the accuracy and repeatability of a three-dimensional motion analysis system to quantitatively measure the relative motion of the intermediate component of tripolar total hip arthroplasty prostheses. Static and dynamic validations of the system were made by comparing the measurement to that of a potentiometer. Differences between the mean system-calculated angle and the angle measured by the potentiometer were within ±1°. The mean within-trial variability was less than 1°. The mean slope was 0.9-1.02 for different angular velocities. The dynamic noise was within 1°. The system was then applied to measure the relative motion of an eccentric THA prosthesis. The study shows that this motion analysis system provides an accurate and practical method for measuring the relative motion of the tripolar THA prosthesis in vitro, a necessary first step towards the understanding of its in vivo kinematics.

Original languageEnglish (US)
Pages (from-to)505-512
Number of pages8
JournalMedical Engineering and Physics
Volume27
Issue number6
DOIs
StatePublished - Jul 1 2005

Keywords

  • Double mobility
  • Motion analysis
  • Prosthesis
  • Total hip arthroplasty
  • Tripolar

ASJC Scopus subject areas

  • Biophysics
  • Biomedical Engineering

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