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Natural course of nontraumatic rotator cuff tendinitis and shoulder symptoms in a working population.

Silverstein-BA; Viikari-Juntura-E; Fan-ZJ; Bonauto-DK; Bao-S; Smith-C
Scand J Work, Environ & Health 2006 Apr; 32(2):99-108
This study assessed the prevalence, incidence, and persistence of nontraumatic rotator cuff tendinitis and shoulder symptoms over a 1-year period in a working population and the predictive value of symptoms and physical findings. A 1-year prospective study of 436 active workers was conducted at 12 different worksites. Detailed health interviews, psychosocial questionnaires, and physical examinations were conducted at baseline and again after 1 year, with shorter evaluations at 4 and 8 months. Individual observed exposure assessment of shoulder posture, arm-hand activity, and hand forces was conducted. The prevalence of rotator cuff tendinitis at baseline was 7.6% [95% confidence interval (95% CI 5.1-10.1%)] for the right and 4.8% (95% CI 3.0-7.0%) for the left, compared with shoulder symptoms of 18.6% (95% CI 14.9-22.3%) (right) and 11.2% (95% CI 8.2-14.2%) (left). The incidence of rotator cuff tendinitis was 5.5% (95% CI 2.8-6.8%) and 2.9% (95% CI 1.0-3.8%), respectively. Higher proportions of participants with current symptoms or physical findings at baseline became clinical cases after 1 year than those without symptoms or findings. The 1-year persistence of clinical case status was 31.3% (95% CI 26.9-35.7%) (right) and 31.6% (95% CI 27.2-36.0%) (left). There were significant differences at baseline between the asymptomatic participants and the clinical cases with respect to physical health on the 12-item Short-form Health Survey (P=0.0002), the perception of general health (P=0.0027), and the frequency of high hand force exposure (P=0.0177). Considerable movement occurs between different stages of shoulder problems. Symptoms and physical findings alone appear to predict clinical case status within 1 year. Frequent follow-up is necessary to capture changes in health and exposure status in prospective studies.
Workers; Worker-health; Injuries; Occupational-health; Questionnaires; Occupational-exposure; Exposure-assessment; Posture; Arm-injuries; Occupational-diseases; Author Keywords: active worker; incidence; prevalence
Safety and Health Assessment and Research for Prevention (SHARP), Washington State Department of Labor and Industries, PO Box 44330, Olympia, WA 98504-4330, USA
Publication Date
Document Type
Journal Article
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Cooperative Agreement
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Priority Area
Disease and Injury: Musculoskeletal Disorders of the Upper Extremities
Source Name
Scandinavian Journal of Work, Environment and Health
Performing Organization
Washington State Department of Labor and Industries