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Published on: January 11, 2019
Guidelines for wrist posture based on carpal tunnel pressure thresholds
Peter J Keir1, Joel M Bach, Mark Hudes
1Department of Kinesiology, McMaster University, Hamilton, Ontario, Canada.
Human Factors
|February 24, 2007
Summary
New guidelines for wrist posture at work were developed based on carpal tunnel pressure. These findings help prevent carpal tunnel syndrome by defining safe wrist angles during various tasks.
Area of Science:
- Occupational health and ergonomics
- Biomechanics of the upper extremity
Background:
- Wrist posture is a known risk factor for upper extremity musculoskeletal disorders.
- Sustained wrist deviation may contribute to carpal tunnel syndrome, but evidence-based guidelines are lacking.
Purpose of the Study:
- To establish work guidelines for wrist posture.
- To determine safe wrist angles based on carpal tunnel pressure.
Main Methods:
- Examined the relationship between wrist posture and carpal tunnel pressure in 37 healthy participants.
- Measured carpal tunnel pressure across various wrist extension-flexion and radioulnar deviation angles.
- Identified wrist angles corresponding to 25 and 30 mmHg carpal tunnel pressure.
Main Results:
- The 25th percentile angles (protecting 75% of participants) at 30 mmHg were: 32.7° extension, 48.6° flexion, 21.8° radial deviation, 14.5° ulnar deviation.
- At 25 mmHg, these angles were 26.6° extension, 37.7° flexion, 17.8° radial deviation, and 12.1° ulnar deviation.
Conclusions:
- The study provides a method for developing wrist posture guidelines.
- These guidelines can inform the design of tools and hand-intensive tasks to reduce carpal tunnel pressure.
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