RT Journal Article
SR Electronic
T1 Risk of fragility fracture among patients with gout and the effect of urate-lowering therapy
JF Canadian Medical Association Journal
JO CMAJ
FD Canadian Medical Association
SP E581
OP E587
DO 10.1503/cmaj.170806
VO 190
IS 19
A1 Alyshah Abdul Sultan
A1 Rebecca Whittle
A1 Sara Muller
A1 Edward Roddy
A1 Christian D. Mallen
A1 Milica Bucknall
A1 Toby Helliwell
A1 Samantha Hider
A1 Zoe Paskins
YR 2018
UL http://www.cmaj.ca/content/190/19/E581.abstract
AB BACKGROUND: Previous studies that quantified the risk of fracture among patients with gout and assessed the potential effect of urate-lowering therapy have provided conflicting results. Our study aims to provide better estimates of risk by minimizing the effect of selection bias and confounding on the observed association.METHODS: We used data from the Clinical Practice Research Datalink, which records primary care consultations of patients from across the United Kingdom. We identified patients with incident gout from 1990 to 2004 and followed them up until 2015. Each patient with gout was individually matched to 4 controls on age, sex and general practice. We calculated absolute rate of fracture and hazard ratios (HRs) using Cox regression models. Among patients with gout, we assessed the impact of urate-lowering therapy on fracture, and used landmark analysis and propensity score matching to account for immortal time bias and confounding by indication.RESULTS: We identified 31 781 patients with incident gout matched to 122 961 controls. The absolute rate of fracture was similar in both cases and controls (absolute rate = 53 and 55 per 10 000 person-years, respectively) corresponding to an HR of 0.97 (95% confidence interval 0.92–1.02). Our finding remained unchanged when we stratified our analysis by age and sex. We did not observe statistically significant differences in the risk of fracture among those prescribed urate-lowering therapy within 1 and 3 years after gout diagnosis.INTERPRETATION: Overall, gout was not associated with an increased risk of fracture. Urate-lowering drugs prescribed early during the course of disease had neither adverse nor beneficial effect on the long-term risk of fracture.