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Design and Validation of a Hand Interossei Muscle Dynamometer (HIMDNA) for Finger Abduction and Adduction Strength
Seung Yeon Cho1, Geunwu Gimm2,3, Sungwoo Park1,4
1Interdisciplinary Program in Bioengineering, The Graduate School, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea.
Annals of Biomedical Engineering
|March 22, 2026
Summary
A new Hand Interossei Muscle Dynamometer (HIMDNA) reliably measures finger abduction and adduction strength. This tool aids in diagnosing ulnar nerve disorders by providing quantitative interossei muscle assessments.
Area of Science:
- Hand biomechanics and neuromuscular assessment.
- Development and validation of novel medical devices.
Background:
- Interossei muscles are crucial for fine motor control and grip.
- Ulnar nerve disorders can impair interossei muscle function.
- Quantitative assessment aids diagnosis and monitoring of these conditions.
Purpose of the Study:
- To develop and validate the Hand Interossei Muscle Dynamometer (HIMDNA).
- To quantify finger abduction and adduction strength.
- To establish normative strength values for healthy adults.
Main Methods:
- HIMDNA designed for examiner-independent, uniaxial force measurement.
- Tested on 48 healthy adults (aged 20-39 years).
- Validated against handheld dynamometer (HHD); assessed reliability and usability.
Main Results:
- HIMDNA showed excellent agreement with HHD (Pearson's r=0.927–0.967; ICC=0.911–0.956).
- Demonstrated superior inter- and intra-rater reliability (ICC=0.963–0.983).
- Normative values established; HIMDNA rated higher in usability than HHD.
Conclusions:
- HIMDNA is a reliable, valid, and user-friendly tool.
- Enables quantitative evaluation of interossei muscle strength.
- Potential clinical application for ulnar nerve disorder assessment.
