The opinions or assertions contained herein are the private views of the authors and are not to be construed as official or as reflecting the views of the Department of the Army or the Department of Defense. All authors are employees of the United States government, and this work was prepared as part of their official duties.
The incidence of primary hip osteoarthritis in active duty US military servicemembers†
Article first published online: 30 MAR 2009
Copyright © 2009 by the American College of Rheumatology
Arthritis Care & Research
Volume 61, Issue 4, pages 468–475, 15 April 2009
How to Cite
Scher, D. L., Belmont, P. J., Mountcastle, S. and Owens, B. D. (2009), The incidence of primary hip osteoarthritis in active duty US military servicemembers. Arthritis & Rheumatism, 61: 468–475. doi: 10.1002/art.24429
- Issue published online: 30 MAR 2009
- Article first published online: 30 MAR 2009
- Manuscript Accepted: 7 JAN 2009
- Manuscript Received: 6 AUG 2008
Although multiple studies have reported the prevalence of primary hip osteoarthritis (OA), little has been reported on incidence rates of hip OA. We sought to determine the incidence rate and demographic risk factors of hip OA in an ethnically diverse and physically active population of US military servicemembers.
A query was performed using the US Defense Medical Epidemiology Database for the International Classification of Diseases, Ninth Revision, Clinical Modification code for hip OA (715.95). Multivariate Poisson regression analysis was used to estimate the rate of hip OA per 100,000 person-years, controlling for sex, race, age, rank, and service.
The overall unadjusted incidence rate of hip OA was 35 per 100,000 person-years. Women, compared with men, had a significantly increased adjusted incidence rate ratio for hip OA of 1.87 (95% confidence interval [95% CI] 1.73–2.01). The adjusted incidence rate ratio for black servicemembers when compared with white servicemembers was 1.32 (95% CI 1.23–1.41). The adjusted incidence rate ratio for the ≥40-year-old age group compared with the 20-year-old group was 22.21 (95% CI 17.54–28.14). With junior officers as the referent category, junior enlisted, senior enlisted, and senior officers rank groups had a significantly increased adjusted incidence rate ratio for hip OA. With the Air Force as the referent category, each service had a significantly increased adjusted incidence rate ratio for hip OA.
Female sex; black race; age ≥40 years; junior enlisted, senior enlisted, and senior officer rank groups; and military service in the Navy, Army, or Marines were all risk factors for hip OA.