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A Novel Intrinsic Foot Muscle Strength Dynamometer Demonstrates Moderate-To-Excellent Reliability and Validity.

Jennifer Xu1, Dante D Goss1, Susan A Saliba1

  • 1Kinesiology University of Virginia.

International Journal of Sports Physical Therapy
|August 7, 2023
PubMed
Summary
This summary is machine-generated.

A new, affordable intrinsic foot muscle (IFM) dynamometer demonstrates good reliability and validity for assessing IFM strength in healthy individuals. This tool aids clinicians in tracking strength changes crucial for foot function.

Keywords:
foot healthfoot injuryhandheld dynamometerintrinsic foot muscle strengthintrinsic foot musclesreliabilitystrength testing

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Area of Science:

  • Biomechanics
  • Musculoskeletal health
  • Clinical assessment tools

Background:

  • Intrinsic foot muscle (IFM) weakness impacts foot function, necessitating accurate strength assessment.
  • Current methods for measuring IFM strength with the foot on the ground lack clinical applicability, reliability, and validity.

Purpose of the Study:

  • To evaluate the intra-rater and inter-rater reliability of a novel, cost-effective IFM dynamometer.
  • To determine the agreement between the new IFM dynamometer and a handheld dynamometer (HHD).
  • To explore correlations between foot morphology, activity levels, and IFM strength.

Main Methods:

  • A descriptive laboratory study involving 34 healthy volunteers (4 male, 30 female).
  • IFM strength was measured twice by two assessors using the novel dynamometer to assess reliability.
  • Validity was assessed by comparing the novel dynamometer's measurements to those obtained with an HHD in the first session.

Main Results:

  • The novel IFM dynamometer exhibited moderate-to-excellent intra- and inter-rater reliability (ICC = 0.73 - 0.95).
  • Most strength measurements showed agreement with the HHD within the 95% limits.
  • Wider foot morphology and higher recent walking activity correlated significantly, though modestly, with IFM strength.

Conclusions:

  • The novel IFM dynamometer is a reliable and valid tool for assessing intrinsic foot muscle strength in healthy individuals.
  • This budget-friendly ($75) device offers a practical solution for clinicians.
  • Findings support its use in clinical settings for monitoring IFM strength.