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Quantifying Hand Strength and Isometric Pinch Individuation Using a Flexible Pressure Sensor Grid.

Brian J Conway¹, Léon Taquet², Timothy F Boerger²

¹Medical College of Wisconsin, Milwaukee, WI 53226, USA.

Sensors (Basel, Switzerland)

|July 14, 2023

Summary

Quantifying isometric pinch individuation is crucial for assessing hand function after nerve injury. A commercial pressure sensor grid showed poor repeatability for pinch individuation, highlighting the need for better assessment tools.

Keywords:

Tekscan finger isometric individuation hand motor function hand strength neurophysiology

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Area of Science:

Neuroscience
Rehabilitation Medicine
Biomedical Engineering

Background:

Isometric pinch individuation is vital for daily activities and can be impaired by nervous system injuries.
Current methods for quantifying pinch individuation lack standardization and consistency.
Objective and repeatable assessments are needed for surgical and rehabilitative efforts.

Purpose of the Study:

To evaluate the repeatability of a commercial flexible pressure sensor grid (Tekscan F-Socket) for measuring isometric pinch individuation and maximum voluntary contraction (MVC).
To assess the reliability of a novel equation for calculating isometric individuation scores.

Main Methods:

Twenty healthy, right-handed volunteers participated in two assessment visits.
Isometric pinch individuation and MVC were measured using a Tekscan F-Socket pressure sensor grid.
A novel equation was used to calculate individuation scores based on force percentage.

Main Results:

Maximum voluntary contraction (MVC) measurements demonstrated high intra-class correlation coefficients (ICCs), indicating good repeatability (left: 0.86, right: 0.88).
Individuation score ICCs were poor, suggesting insufficient repeatability for this specific assessment (left index: 0.41, right index: -0.02).

Conclusions:

The tested pressure sensor grid protocol did not provide a sufficiently repeatable assessment for isometric pinch individuation.
Novel platforms are required for developing reliable and objective isometric hand dexterity assessments.
Further research is needed to establish standardized metrics for pinch force modulation.