Self-reported frailty is associated with low calcaneal bone mineral density in a multiracial population of community-dwelling elderly.

Abstract

Low bone mineral density (BMD) is associated with frailty assessed using performance-based measures. However, the latter can be cumbersome and difficult to standardize. We examined whether an easily obtained self-reported frailty measure also predicted low BMD. In 230 elderly (82% female, 58% African-American), calcaneal BMD was measured by DXA and frailty evaluated using the VES-13 questionnaire. In addition to the original scoring, we developed a modified scoring system which provided a broader assessment of frailty and excluded age, which is a known independent predictor of BMD. A telephone interview conducted 6 years later ascertained interval fragility fractures and survival status. A higher modified frailty score was associated with lower BMD (p = 0.002), even after adjusting for age, weight, sex, and race and was more predictive of death at 6 years (p = 0.009) than the original score (p = 0.08). Based on our model, a subject with the highest frailty score differed from an otherwise similar subject with the lowest score by a calcaneal BMD of 1.4 T-score units, corresponding to 2-3 times higher fracture risk. Self-reported frailty is associated with low calcaneal BMD and can be used to identify subjects with a greater risk of osteoporosis than expected from traditional risk factors.