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Measuring foam model shapes with a contact digitizer.

Joan E Sanders1, Michael R Severance

  • 1University of Washington, PO Box 355061, 3720 15th Ave NE Seattle, WA 98195-5, USA. jsanders@u.washington.edu

Prosthetics and Orthotics International
|April 26, 2011
PubMed
Summary

A new resin coating technique improves foam model measurement accuracy for contact digitizers, minimizing introduced error. This enhances the precision of socket model data for clinical applications.

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Area of Science:

  • Biomedical Engineering
  • Prosthetics and Orthotics

Background:

  • Contact digitizers struggle with soft foam models due to stylus adhesion.
  • Accurate measurement of foam socket models is crucial for prosthetic limb fitting.

Purpose of the Study:

  • To describe a resin coating technique for measuring foam socket models with contact digitizers.
  • To assess the impact of this technique on digitizer measurement error.

Main Methods:

  • A controlled laboratory study involving 30 trans-tibial socket models.
  • Measurement using a custom mechanical digitizer after applying a thin resin coating.
  • Calculating and subtracting resin thickness to determine digitizer error.

Main Results:

  • The resin coating technique minimally impacted overall accuracy.

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  • Total instrument error was 0.1% for model volume and 0.05 mm for mean radii.
  • Root-mean-square error for individual points was 0.08 mm.

    • Conclusions:

    • The resin coating method is a viable technique for improving foam model measurement.
    • This method minimizes introduced error, ensuring accurate data for socket fabrication.
    • Accurate measurements support clinical providers in delivering high-quality prosthetic sockets.