Annals of the Rheumatic Diseases 2009;68:99-102
CLINICAL AND EPIDEMIOLOGICAL RESEARCH
Clinical subsequent fractures cluster in time after first fractures
1 Department of General Practice, Maastricht University, Maastricht, The Netherlands
2 Department of Trauma Surgery, Maastricht University Medical Centre, Maastricht, The Netherlands
3 Department of Internal Medicine, Subdivision of Rheumatology, Maastricht University Medical Centre, Maastricht, The Netherlands
4 Biomedical Research Institute, University Hasselt, Hasselt, Belgium
5 Department of Methodology and Statistics, Maastricht University, Maastricht, The Netherlands
T van Geel, Maastricht University, Department of General Practice, PO Box 616, 6200 MD, Maastricht, The Netherlands; t.vangeel{at}hag.unimaas.nl
Objectives: The risk of subsequent fractures is double the risk of having a first fracture. We analysed whether this risk is constant or not over time.
Methods: A population-based study in 4140 postmenopausal women, aged between 50 and 90 years, on radiographic confirmed clinical fractures from menopause onwards analysed by Cox regression.
Results: A total of 924 (22%) women had a first fracture and 243 (26% of 924) a subsequent fracture. Of all first fractures, 4% occurred in each year from menopause onwards, while after a first fracture 23% of all subsequent fractures occurred within 1 year and 54% within 5 years.
When calculated from time of first fracture, the relative risk (RR) of subsequent fracture was 2.1 (95% CI 1.7 to 2.6) and remained increased over 15 years. When calculated for specific time intervals after a first fracture, the RR was 5.3 (95% CI 4.0 to 6.6) within 1 year, 2.8 (95% CI 2.0 to 3.6) within 2–5 years, 1.4 (95% CI 1.0 to 1.8) within 6–10 years and 0.41 (95% CI 0.29 to 0.53) after >10 years.
Conclusions: From menopause onwards, clinical fractures cluster in time, indicating the need for early action to prevent subsequent fractures.
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