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Shoulder disorders and postural stress in automobile assembly.

Authors
Punnett-L; Fine-LJ; Keyserling-WM; Herrin-GD; Chaffin-DB
Source
Scand J Work, Environ & Health 2000 Aug; 26(4):283-291
NIOSHTIC No.
20032626
Abstract
Objectives: A case-referent study was conducted in an automobile assembly plant to evaluate the risk of shoulder disorders associated with nonneutral postures. Methods: The cases were workers who reported shoulder pain to the plant clinic during a 10-month period and met symptom criteria (pain frequency or duration in the past year) in an interview; more than one-half also had positive findings in a physical examination. The referents were randomly selected workers who were free of shoulder disorders according to the clinic records, the interview, and the physical examination. For each of the 79 cases and 124 referents, 1 job was analyzed for postural and biomechanical demands by an analyst blinded to the case-referent status. Results: Forty-one percent of the subjects flexed or abducted the right arm "severely" (above 90 degrees) during the job cycle, and 35% did so with the left arm. The peak torques at the shoulder were rather low. Shoulder disorders were associated with severe flexion or abduction of the left [odds ratio (OR) 3.2, 95% confidence interval (95% CI) 1.5-6.5] and the right (OR 2.3, 95% CI 1.2-4.8) shoulder. The risk increased as the proportion of the work cycle exposed increased. The relationships were similar for the cases with and without physical findings. Use of hand-held tools increased the risk and also modified the association with postural stress, although the joint exposure distributions limited full analysis of this finding. Conclusions: The findings support the conclusion that severe shoulder flexion or abduction, especially for 10% or more of the work cycle, is predictive of chronic or recurrent shoulder disorders.
Keywords
Automotive-industry; Biomechanics; Biomechanical-engineering; Ergonomics; Musculoskeletal-system; Musculoskeletal-system-disorders; Job-analysis; Posture; Repetitive-work; Cumulative-trauma; Cumulative-trauma-disorders; Humans; Injury-prevention; Statistical-analysis
Contact
Dr L Punnett, Department of Work Environment, University of Massachusetts Lowell, One University Avenue, Lowell MA 01854, USA
CODEN
SWEHDO
Publication Date
20000801
Document Type
Journal Article
Email Address
Laura]unnett@UMLEDU
Fiscal Year
2000
NTIS Accession No.
NTIS Price
Issue of Publication
4
ISSN
0355-3140
NIOSH Division
DSHEFS
Source Name
Scandinavian Journal of Work, Environment and Health
State
OH
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