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Measurement of Spatial Stability in Precision Grip

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Published on: June 4, 2020

GripAble: An accurate, sensitive and robust digital device for measuring grip strength.

Michael Mace¹, Sharah Abdul Mutalib^1,2, Matjaz Ogrinc^1,2

¹GripAble Limited, London, UK.

Journal of Rehabilitation and Assistive Technologies Engineering

|March 7, 2022

Summary

GripAble, a new wireless handgrip device, accurately measures grip strength isometrically and elastically. It is sensitive, robust, and suitable for diverse clinical applications in hand function assessment and training.

Keywords:

Grip strength GripAble Jamar assessment dynamometry force sensing hand therapy home-based rehabilitation neurorehabilitation occupational therapy physiotherapy telerehabilitation

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Area of Science:

Biomedical Engineering
Rehabilitation Technology
Clinical Measurement

Background:

Grip strength is a key indicator of overall health and widely used in clinical settings.
Existing methods for grip strength measurement require validation for new devices.
Hand function assessment and training are crucial in various clinical populations.

Purpose of the Study:

To evaluate the measurement characteristics of GripAble, a novel wireless handgrip device.
To assess the accuracy, sensitivity, and robustness of the GripAble device for grip force measurement.
To compare GripAble's performance against industry-standard devices.

Main Methods:

Bench testing to determine grip force measurement accuracy and sensitivity.
Repeated drop tests to assess measurement robustness and performance degradation.
Evaluation of isometric and elastically-resisted grip force measurements.

Main Results:

GripAble demonstrated low absolute measurement error (<0.81 kg elastically, <1.67 kg isometrically).
High sensitivity (0.062 ± 0.015 kg) was observed, independent of applied force.
The device showed no significant performance degradation after 30 drops from over 1.5m.

Conclusions:

GripAble is an accurate, sensitive, and robust grip strength dynamometer.
Its portability and digital tracking features enhance its clinical applicability.
The device is suitable for a broad range of clinical caseloads and environments for hand function assessment and training.