Managing osteoporosis with FRAX® in Australia: Proposed new treatment thresholds from the 45&Up Study cohort

Abstract

IntroductionMany people at high risk of fractures are not following traditional guidelines and not being recommended for intervention. This study aimed to propose and evaluate a new set of intervention thresholds. MethodsParticipants were 213,375 men and women aged ≥50years living in New South Wales, Australia. Fracture Risk Assessment Paper Charts (Australia) was used to estimate the 10-year fracture risk. The standardized rates (to Australia population distribution 2007) for intervention were calculated for different thresholds: our proposed new thresholds (i.e. 10-year probability of hip fracture: ≥3%, 5% or 7% for 50–69, 70–79 and ≥80years respectively), thresholds by the National Osteoporosis Guideline Group (NOGG) approach, UK thresholds and US thresholds. ResultsThe NOGG, UK and US thresholds did not work well in the Australian population. For example, the NOGG and UK thresholds respectively qualified only 1 in 12 (8.1%) and 1 in 9 (11.3%) Australian men aged ≥70years and the US thresholds qualified about 9 in 10 (90.6%) Australian women aged ≥70years. For men or women aged ≥70years, our proposed new thresholds gave more realistic treatment rates of 21.6% for men and 70.5% for women. Compared to the current Australian guidelines (i.e. T-score≤−2.5 and age≥70years or a fragility fracture), our thresholds identified an additional 4.9% of men and 18.2% of women aged≥70years for treatment. ConclusionThe proposed new thresholds could identify currently under-recognised high-risk individuals for treatment. It should be considered as a recommendation for osteoporosis management in Australia.