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Related Experiment Video

Updated: May 14, 2025

Use of a Foot-Induced Digitally Controlled Resistance Device for Functional Magnetic Resonance Imaging Evaluation in Patients with Foot Paresis
08:58

Use of a Foot-Induced Digitally Controlled Resistance Device for Functional Magnetic Resonance Imaging Evaluation in Patients with Foot Paresis

Published on: July 7, 2023

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A novel method for analyzing foot motion during circumduction using an electromagnetic tracking system.

Nicholas R Entress1,2, Michael J Fassbind1,2, Eric S Rohr1

  • 1RR&D Center for Limb Loss and MoBility (CLiMB), VA Puget Sound Health Care System, Seattle, WA, USA.

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
|April 12, 2025
PubMed
Summary

This study quantifies hindfoot motion during circumduction using electromagnetic sensors. The developed method accurately characterizes complex foot bone movements, aiding in differentiating foot types.

Keywords:
Bone motionFourier series expansionarch anglecircumductionelectromagnetic sensorsellipsefoot typeparaboloid

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Area of Science:

  • Biomechanics
  • Orthopedics
  • Medical Engineering

Background:

  • Hindfoot circumduction is complex and not confined to traditional anatomical planes.
  • Precise description of hindfoot motion is challenging.
  • Objective measurement of foot bone motion is needed to understand variations in foot shape.

Purpose of the Study:

  • To develop a quantitative method for measuring foot bone motion during circumduction.
  • To characterize differences in foot bone motion among various foot shapes.
  • To establish an objective clinical assessment tool for foot biomechanics.

Main Methods:

  • Utilized electromagnetic tracking sensors attached to specific bony landmarks of the foot.
  • Developed quantitative models including 2D ellipse fitting, paraboloid surface modeling, and 3D Fourier series expansion.
  • Ensured data reliability through a repeatability study, establishing the use of a single rater.

Main Results:

  • Foot bone motion during circumduction was successfully quantified using fitted ellipse parameters.
  • Paraboloid surface modeling and 3D eighth-order Fourier series expansion improved motion accuracy and reduced error.
  • Demonstrated the feasibility of characterizing bone motion differences among feet.

Conclusions:

  • The developed electromagnetic tracking method provides an objective and accurate way to characterize hindfoot bone motion.
  • This technique shows significant promise for clinical applications in differentiating foot types.
  • Further research can refine this method for broader diagnostic use in podiatry and orthopedics.