Hand-arm vibration syndrome
Industrial disease from vibrating tools affecting blood vessels, nerves, and joints.
Hand-arm vibration syndrome (HAVS) is a recognized industrial disease affecting tens of thousands of workers, caused by continuous use of vibrating hand-held machinery. It is a disorder that affects the blood vessels, nerves, muscles, and joints of the hand, wrist, and arm, and constitutes a secondary form of Raynaud's syndrome. The condition is also known as vibration white finger (VWF) or dead finger, though the term vibration white finger has generally been superseded in professional usage by the broader descriptor HAVS.
- field
- Occupational safety and health
- known_for
- Industrial injury from hand-arm vibrations, causing vascular, neurological, and musculoskeletal damage
- symptoms
- Tingling, numbness, finger color changes, loss of manual dexterity, reduced grip strength
- risk_frequencies
- 5 to 2000 Hz; greatest risk for fingers between 50 and 300 Hz
- affected_occupations
- Mining, foundry, construction, dentistry
Lore & Background
Hand-arm vibration syndrome is an industrial injury triggered by continuous use of vibrating hand-held machinery. Its best known effect is vibration-induced white finger (VWF), a term introduced by the Industrial Injury Advisory Council in 1970. Injury can occur at frequencies between 5 and 2000 Hz, but the greatest risk for fingers is between 50 and 300 Hz. The total risk exposure for hand and arm is calculated using ISO 5349-1, which stipulates maximum damage between 8 and 16 Hz and a rapidly declining risk at higher frequencies; however, this standard has been criticized as corresponding poorly to observational data, with more recent research suggesting that medium and high frequency vibrations also increase HAVS risk.
Reader's Guide
Hand-arm vibration syndrome remains a significant occupational hazard, with regulatory responses varying by country. The Occupational Safety and Health Administration in the United States has yet to offer official exposure action or limit values, while the Health and Safety Executive of the British Government suggests an Exposure Action Value of 2.5 m/s² and an Exposure Limit Value of 5.0 m/s², based on the EU directive from 2002. However, those exposure levels are still not safe, as 10% of a population would get sensorineural injuries after 5 years at action level exposure. The Canadian Centre for Occupational Health and Safety promotes the ACGIH Threshold Limit Values. Damage prevention relies on assessing vibration exposure in terms of acceleration, amplitude, and duration; using anti-vibration gloves, which are highly dependent on frequency range; and implementing engineering controls, medical surveillance, personal protective equipment, and administrative controls such as limiting hours of tool use. The Control of Vibration at Work Regulations 2005 in the UK governs exposure and assists with preventing HAVS. The condition's legacy includes driving tool designers to innovate to reduce vibration, with examples such as the easily manipulated mechanical arm (EMMA) and suspension mechanisms in chainsaws.
Did You Know?
- The term vibration white finger was introduced by the Industrial Injury Advisory Council in 1970.
- Injury can occur at frequencies between 5 and 2000 Hz, with greatest risk for fingers between 50 and 300 Hz.
- According to a study in Sweden, about 2% of all women and 14% of all men use vibrating tools for work.
- The Health and Safety Executive suggests an Exposure Action Value of 2.5 m/s² and an Exposure Limit Value of 5.0 m/s².
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