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Updated: May 28, 2026
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Rat Model of Adhesive Capsulitis of the Shoulder
Published on: September 28, 2018
Secular trend of adhesive capsulitis
1Boston University, Massachusetts, USA. dwtbn@bu.edu
Arthritis Care & Research
|October 29, 2011
Summary
Recent trends show an increasing incidence of adhesive capsulitis (AC) in women, particularly those born more recently. This study identified a birth cohort effect, suggesting higher risk for younger women with this painful shoulder condition.
Area of Science:
- Epidemiology
- Orthopedics
- Public Health
Background:
- Adhesive capsulitis (AC) is a prevalent shoulder disorder causing significant pain and functional limitations.
- Risk factors for AC, including diabetes mellitus, have been increasing, necessitating an investigation into AC incidence trends.
Purpose of the Study:
- To investigate the secular trend of adhesive capsulitis (AC) incidence.
- To determine if AC incidence has increased over time and identify contributing factors.
Main Methods:
- Utilized electronic medical records from The Health Improvement Network (UK, 1995-2008).
- Included individuals aged 40-79, defining incident AC cases based on the first diagnosis.
- Employed an age-period-cohort model to analyze trends, adjusting for diabetes mellitus.
Main Results:
- Overall AC incidence was 2.36/1000 person-years for men and 3.38/1000 person-years for women.
- An increasing secular trend was observed, primarily driven by a birth cohort effect, not calendar time.
- Women born in more recent cohorts exhibited an 8% increased incidence rate per 10-year increment (HR 1.08).
- No significant increase in AC incidence was found for men. Adjusting for diabetes mellitus did not substantially alter these findings.
Conclusions:
- Women born more recently face a higher risk of developing adhesive capsulitis (AC) compared to earlier cohorts.
- Further research is required to elucidate the specific risk factors contributing to this observed increase in AC incidence among women.
