Risk of shoulder tendinitis in relation to shoulder loads in monotonous repetitive work

Am J Ind Med. 2002 Jan;41(1):11-8. doi: 10.1002/ajim.10019.


Background: Few studies relate the occurrence of shoulder disorders to quantified ergonomic exposures. This study evaluates the hypothesis that shoulder loads in repetitive work might contribute to the occurrence of shoulder tendinitis.

Methods: This is a cross-sectional study of 1961 workers in repetitive work and 782 referents. Shoulder loads were quantified at task level and measures of exposures were assigned based on task distribution. Symptoms in combination with clinical criteria defined shoulder tendinitis.

Results: The prevalence of shoulder tendinitis was higher among exposed workers (adjusted OR 3.1, 95% CI 1.3-3). Neither frequency of movements (ranging 1-36/min) nor lack of micro-pauses in shoulder flexion (ranging 0-100% of cyclus time) was related to disease prevalence. Increasing force requirements (categorized as light = 1, somewhat hard = 2, hard = 3 or very hard = 4) increased risk slightly (OR 1.6, 95% CI 1.0-2.6 per unit).

Conclusions: The results indicate that workers with repetitive tasks have increased risk of shoulder tendinitis, which partially can be attributed to force requirements.

Publication types

  • Multicenter Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Cross-Sectional Studies
  • Cumulative Trauma Disorders / epidemiology
  • Cumulative Trauma Disorders / etiology*
  • Female
  • Humans
  • Male
  • Occupational Diseases / epidemiology
  • Occupational Diseases / etiology*
  • Prevalence
  • Risk Assessment
  • Risk Factors
  • Shoulder
  • Surveys and Questionnaires
  • Tendinopathy / epidemiology
  • Tendinopathy / etiology*