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Reliability and Validity of Individual Finger Flexor Strength Measurement Using the Martin Vigorimeter.

Hyung-Jin Chung1, Seung Hoo Lee, Meesun Jung

  • 1From the Department of Orthopedic Surgery, Chungnam National University Sejong Hospital, Sejong-si, South Korea.

Annals of Plastic Surgery
|December 8, 2025
PubMed
Summary

The smallest bulb of the Martin Vigorimeter (MV) reliably measures individual finger flexor strength in healthy adults. This accessible tool provides results comparable to specialized equipment, aiding in hand strength assessment.

Keywords:
ASHT: American Society of Hand TherapistsICC: intraclass correlation coefficientIRB: institutional review boardMDC: minimal detectable changeMV: Martin VigorimeterMartin VigorimeterSEM: standard error of measurementdigit strengthfinger flexor strengthfinger strengthgrip strength

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Area of Science:

  • Biomechanics
  • Hand Strength Assessment
  • Rehabilitation Technology

Background:

  • Limited research exists on assessing individual finger flexor strength.
  • Existing grip strength tools may not accurately capture isolated finger function.

Purpose of the Study:

  • To evaluate the test-retest reliability of the smallest bulb of the Martin Vigorimeter (MV) for measuring individual finger flexion strength.
  • To compare the MV's findings for finger flexor strength with established methods.

Main Methods:

  • 100 healthy adults without hand pathology participated.
  • Individual finger flexor strength was measured using the small bulb of the MV.
  • Measurements were repeated after 3 weeks to assess test-retest reliability.

Main Results:

  • The MV demonstrated good-to-excellent reliability (ICC=0.805-0.914) for individual finger flexor strength.
  • The middle finger showed the highest contribution (approx. 30%), followed by index and ring fingers (25%-26%).
  • Results were comparable to those obtained with specialized equipment.

Conclusions:

  • The smallest bulb of the MV is a reliable and accessible tool for assessing individual finger flexor strength in healthy adults.
  • Findings support the use of the MV for clinical and research purposes in hand function evaluation.