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Accuracy and feasibility of using an electrogoniometer for measuring simple thumb movements
Per Jonsson1, Peter W Johnson, Mats Hagberg
1Occupational and Environmental Medicine, Sahlgrenska University Hospital and Academy at Göteborg University, Göteborg, Sweden. per.jonsson@amm.gu.se
Ergonomics
|April 25, 2007
Summary
This study found electrogoniometers accurately measure thumb movements during mobile phone use. These devices can help assess risks associated with handheld technology and thumb joint angles.
Area of Science:
- Biomechanics
- Ergonomics
- Human-Computer Interaction
Background:
- Thumb disorders are linked to handheld device use.
- Modern life involves extensive use of mobile phones and similar devices.
- Understanding thumb movement is crucial for preventing musculoskeletal injuries.
Purpose of the Study:
- To assess the accuracy and feasibility of using electrogoniometers for measuring thumb movements.
- To compare electrogoniometer measurements with a manual goniometer benchmark.
- To investigate thumb joint postures and movement velocities during mobile phone use.
Main Methods:
- Electrogoniometers (Model SG 110; Biometrics) were used to measure thumb flexion/extension and adduction/abduction in 15 subjects.
- Measurements were compared against a manual goniometer.
- Thumb movements were recorded during simulated mobile phone use.
Main Results:
- Electrogoniometric measurement errors were below 4 and 5 degrees for adduction/abduction and flexion/extension, respectively.
- Differences in maximal joint angles correlated with mobile phone size.
- Adduction/abduction movements occurred at twice the velocity of flexion/extension movements.
Conclusions:
- Electrogoniometers are accurate and feasible tools for studying thumb movements.
- Findings suggest potential for evaluating thumb-based input devices and understanding mobile phone-related musculoskeletal risks.
- Movement velocity during device use may be a factor in injury risk.
