Physical work and chronic shoulder disorder. Results of a prospective population-based study
- 1Department of Work Environment, University of Massachusetts Lowell, USA
- 2Centre of Expertise for Health and Work Ability, Finnish Institute of Occupational Health, Helsinki, Finland
- 3Department of Health and Functional Capacity, Finnish National Public Health Institute, Helsinki, Finland
- Dr Helena Miranda, Finnish Institute of Occupational Health, Helsinki, Topeliuksenkatu 41 a A, 00250 Helsinki Finland;
- Accepted 18 May 2007
- Published Online First 25 May 2007
Objectives: A study of whether occupational physical load predicted subsequent chronic shoulder disorders.
Methods: A comprehensive national survey was carried out among a representative sample (n = 7217) of the Finnish adult population in 1977–80. Twenty years later, 1286 participants from the previous survey were invited to be re-examined, and 909 (71%) participated. After excluding those with diagnosed shoulder disorders at baseline, 883 subjects were available for the analyses.
Results: At follow-up, a physician diagnosed chronic shoulder disorders in 63 subjects (7%) using a standardised protocol. Work exposure to repetitive movements and vibration at baseline increased the risk of shoulder disorder: adjusted ORs 2.3 (95% CI 1.3 to 4.1) and 2.5 (1.2 to 5.2), respectively. Exposure to several physical factors increased the risk further, the adjusted OR was nearly 4 for at least three exposures. The adverse effects of physical work were seen even among those older than 75 years at follow-up. The statistically significant risk factors differed between genders: for men vibration and repetitive movements, and for women lifting heavy loads and working in awkward postures. Age and body mass index modified the effects of the physical exposures. The results remained similar after excluding those with any shoulder pain at baseline.
Conclusions: This is the first prospective study in a general population showing that occupational physical loading increases the risk of a subsequent clinical shoulder disorder and the effects seem to be long-term. Early preventive measures at the workplace may have long-lasting health benefits for the shoulder.
Competing interests: None.