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Related Experiment Videos

Simultaneous shear and pressure sensor array for assessing pressure and shear at foot/ground interface.

Jeffrey R Mackey1, Brian L Davis

  • 1MK Optics Inc., 10473 Misty Ridge Drive, Concord Township, OH 44077, USA. jeff.mackey@mkoptics.com <jeff.mackey@mkoptics.com>

Journal of Biomechanics
|November 22, 2005
PubMed
Summary

Diabetic foot ulcers are costly. This study developed an optical system to measure plantar pressure and shear forces, aiding early detection and prevention of these debilitating ulcers.

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Area of Science:

  • Biomedical Engineering
  • Biomechanics
  • Diabetic Complications Research

Background:

  • Diabetic foot ulceration incurs significant healthcare costs in the US.
  • Plantar soft tissue response to external forces and internal changes (vascular, neuropathy) is critical.
  • Elevated pressure and shear forces, combined with altered tissue properties, are key to ulcer development.

Purpose of the Study:

  • To develop a hardware system for clinicians to measure 3D stress tensors on the plantar surface.
  • To identify areas of concern for diabetic foot ulceration.
  • To improve the understanding of biomechanical factors contributing to foot ulcers.

Main Methods:

  • Development of a platform-type hardware system utilizing an optical approach.

Related Experiment Videos

  • Measurement of 3D stress tensors, including pressure and shear patterns.
  • Utilizing polymer-based stress-sensing elements designed for minimal calibration.

    • Main Results:

    • The optical system accurately measures pressure (50-400 kPa) and shear forces.
    • Achieved high frequency response (100 Hz), stress accuracy (100 Pa), and spatial resolution (8.0mm).
    • Demonstrated strong correlation between applied stress loads and optical phase retardance.

    Conclusions:

    • The developed optical system shows promise for non-invasive measurement of plantar stress.
    • This technology can aid clinicians in identifying at-risk individuals for diabetic foot ulcers.
    • The system's design addresses calibration challenges faced by previous multi-sensor systems.