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Hand muscle pathology after long-term vibration exposure
Lars E Necking1, Göran Lundborg, Ronnie Lundström
1Department of Hand Surgery, Malmö University Hospital, University of Lund, Malmö, Sweden. lars.necking@hand.mas.lu.se
Journal of Hand Surgery (Edinburgh, Scotland)
|September 1, 2004
Summary
Hand-arm vibration syndrome causes muscle damage. Morphological changes in the abductor pollicis brevis muscle, like central myonuclei and fibre grouping, correlate with vibration exposure, indicating direct damage to muscle and nerves.
Area of Science:
- Neurology
- Occupational Health
- Muscle Physiology
Background:
- Hand-arm vibration syndrome (HAVS) is a significant occupational health concern.
- The specific pathological changes in muscles affected by HAVS require further elucidation.
Purpose of the Study:
- To investigate the morphological alterations in the abductor pollicis brevis muscle of patients with HAVS.
- To correlate these morphological changes with vibration exposure parameters.
Main Methods:
- Muscle biopsy analysis of the abductor pollicis brevis from 20 HAVS patients.
- Detailed examination of myonuclei location, fibre type grouping, fibre angulation, presence of ring fibres, regenerating fibres, and fibrosis.
- Statistical correlation between morphological findings and cumulative/total vibration exposure.
Main Results:
- All biopsies showed centrally located myonuclei and fibre type grouping.
- Angulated fibres, ring fibres, regenerating fibres, and fibrosis were prevalent in most biopsies.
- Centrally located nuclei correlated significantly with cumulative vibration exposure.
- Angulated fibres correlated significantly with total vibration exposure time.
Conclusions:
- HAVS induces significant morphological changes in the abductor pollicis brevis muscle.
- These changes suggest direct damage to both muscle fibres and motor nerves.
- Vibration exposure parameters are directly linked to the observed muscle pathology.