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Related Experiment Video

Updated: Dec 9, 2025

Predictive Measurement for Windlass Change in Length and Selected Treatment Outcomes in Chronic Plantar Fasciitis
02:15

Predictive Measurement for Windlass Change in Length and Selected Treatment Outcomes in Chronic Plantar Fasciitis

Published on: March 1, 2024

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Novel isodamping dynamometer accurately measures plantar flexor function.

John F Drazan1, Todd J Hullfish1, Josh R Baxter1

  • 1Department of Orthopaedic Surgery, University of Pennsylvania, Philadelphia, PA, USA.

Journal of Biomechanics
|September 6, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces a novel, mobile dynamometer for assessing joint and muscle function outside the lab. The portable device accurately measures plantar flexor function, offering a cost-effective alternative to traditional equipment.

Keywords:
AnkleBiomechanicsDynamometerPersonalized medicinePlantar flexor

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Area of Science:

  • Biomechanics
  • Human Physiology
  • Medical Devices

Background:

  • Isokinetic dynamometers are crucial for assessing in vivo joint and muscle function.
  • Their large size and high cost limit accessibility outside specialized laboratories.

Purpose of the Study:

  • To develop a mobile dynamometer for field measurements of joint-level function.
  • To ensure subject safety through an innovative "isodamping" mechanism.

Main Methods:

  • Developed a novel mobile "isodamping" dynamometer using oil orifice flow for velocity constraint.
  • Validated the device by testing plantar flexor function in six healthy adults against a commercial isokinetic dynamometer.
  • Compared measurements of peak moment and velocity at three different velocities and effort levels.

Main Results:

  • Measurements of peak moment and velocity showed strong correlation with a commercial device (R² > 0.708, p ≤ 0.008).
  • Damper settings effectively prescribed the relationship between peak moment and velocity (R² > 0.910, p < 0.001).
  • The novel device is significantly smaller, lighter, and more affordable than commercial alternatives.

Conclusions:

  • The mobile "isodamping" dynamometer provides a viable and accurate alternative for field-based joint and muscle function assessment.
  • This innovation enhances accessibility for biomechanical research and clinical applications.
  • The device's portability, safety features, and cost-effectiveness address limitations of traditional isokinetic dynamometers.