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Effect of setup configurations of split computer keyboards on wrist angle
1Department of Mechanical and Industrial Engineering, Marquette University, PO Box 1881, Milwaukee, WI 53201-1881, USA. richard.marklin@marquette.edu
Physical Therapy
|March 29, 2001
Summary
Using split keyboards with adjustable halves can reduce wrist ulnar deviation, a risk factor for work-related musculoskeletal disorders (WMSDs). All tested configurations promoted neutral wrist posture, benefiting computer keyboard operators.
Area of Science:
- Ergonomics
- Occupational Health
- Biomechanics
Background:
- Work-related musculoskeletal disorders (WMSDs) pose a significant risk to upper limb health.
- Ulnar deviation is a key risk factor for WMSDs among computer keyboard operators.
- Split keyboards offer adjustable configurations to mitigate WMSDs.
Purpose of the Study:
- To investigate the impact of split keyboard opening angle and separation distance on wrist ulnar deviation.
- To assess the effect of these configurations on typing efficiency.
- To provide evidence-based recommendations for split keyboard setup.
Main Methods:
- Eleven experienced computer keyboard operators participated.
- A split keyboard was tested in a conventional (nonsplit) format.
- Three alternative configurations involved separating keyboard halves at 20 cm, half shoulder width, and shoulder width.
Main Results:
- All three alternative split keyboard configurations significantly reduced ulnar deviation compared to the conventional setup.
- No significant differences in ulnar deviation were observed among the three alternative configurations.
- Typing efficiency was not detailed in the provided results.
Conclusions:
- Alternative split keyboard configurations effectively promote a neutral wrist position.
- These findings offer practical guidance for physical therapists and ergonomists.
- Implementing these configurations can theoretically decrease the risk of WMSDs like carpal tunnel syndrome.