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Upper-limb Postures and Movements during Diamond Polishing
1Ergonomics Program, University of California, 1301 South 46th Street, Building 112, Richmond, CA 94707, USA. rempel@itsa.ucsf.edu
Summary
Diamond polishers experience high rates of upper extremity musculoskeletal disorders, particularly ulnar neuropathy in the right elbow. Repetitive, forceful motions and sustained elbow flexion during polishing likely contribute to these occupational health issues.
Area of Science:
- Occupational health
- Biomechanics
- Musculoskeletal disorders
Background:
- Diamond polishers report high incidence of hand and arm musculoskeletal disorders.
- Ulnar neuropathy, specifically in the right elbow, is a common issue in this profession.
- Repetitive and forceful upper extremity motions are suspected causes.
Purpose of the Study:
- To investigate the biomechanical factors contributing to upper extremity disorders in diamond polishers.
- To analyze the relationship between polishing tasks and specific joint movements.
Main Methods:
- Video-based biomechanical analysis of upper extremities.
- Detailed motion measurements of wrists, elbows, and shoulders during polishing tasks.
- Analysis conducted in Israeli diamond-processing factories.
Main Results:
- The basic polishing cycle is repeated over 5,000 times daily.
- Sustained, extreme flexion of the right elbow was observed.
- This posture is associated with the arm holding the polishing tool's eyepiece.
Conclusions:
- Repetitive polishing motions and sustained elbow flexion are strongly linked to ulnar neuropathy in diamond polishers.
- Biomechanical analysis provides insight into occupational risks.
- Recommendations for ergonomic interventions may be warranted.