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Journal of Hand Surgery (British and European Volume)
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Articles

Hand Muscle Pathology after Long-Term Vibration Exposure

LARS E. NECKING
GÖRAN LUNDBORG
RONNIE LUNDSTRÖM
LARS-ERIC THORNELL
JAN FRIDÉN

From the Department of Hand Surgery, Malmö University Hospital, University of Lund, Malmö, Sweden, Public Health and Clinical Medicine, Occupational Medicine, University of Umeå, Sweden, Department of Anatomy, University of Umeå, Sweden and Department of Hand Surgery, Sahlgrenska University Hospital, University of Göteborg, Sweden

Correspondence: Dr Lars E. Necking, Dept of Hand Surgery, Malmö University Hospital, SE-205 02 Malmö, Sweden. Tel.: +46-40-331723; fax: +46-40-928855; E-mail: lars.necking{at}hand.mas.lu.se

The morphology of the abductor pollicis brevis muscle was studied in 20 patients suffering from hand–arm vibration syndrome. The main morphological changes observed were centrally located myonuclei and fibre type grouping (found in all 20 muscle biopsies), angulated muscle fibres (found in 19 biopsies), ring fibres and regenerating fibres (found in 18 biopsies) and fibrosis (found in 17 biopsies). The observed abnormalities are believed to reflect damage to both the muscle fibres and the motor nerve. The changes were related to different vibration exposure parameters. The number of fibres demonstrating centrally located nuclei correlated significantly with the cumulative vibration exposure, while the number of angulated fibres correlated significantly with the total vibration exposure time. This indicates that the vibrating tools may cause direct damage to muscle fibres as well as nerves.

Key Words: hand-arm vibration syndrome • muscle pathology • CVE • total vibration exposure time • tool acceleration

Journal of Hand Surgery (British and European Volume), Vol. 29, No. 5, 431-437 (2004)
DOI: 10.1016/J.JHSB.2004.05.004
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