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Published in: Archives of Osteoporosis 1/2023

Open Access 01-12-2023 | Osteoporosis | Original Article

Ireland DXA-FRAX may differ significantly and substantially to Web-FRAX

Authors: Lan Yang, Mary Dempsey, Attracta Brennan, Bryan Whelan, E. Erjiang, Tingyan Wang, Rebecca Egan, Kelly Gorham, Fiona Heaney, Catherine Armstrong, Guadalupe Morote Ibarrola, Amina Gsel, Ming Yu, John J. Carey, the DXA MAP Group

Published in: Archives of Osteoporosis | Issue 1/2023

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Abstract

Summary

Appropriate use of FRAX reduces the number of people requiring DXA scans, while contemporaneously determining those most at risk. We compared the results of FRAX with and without inclusion of BMD. It suggests clinicians to carefully consider the importance of BMD inclusion in fracture risk estimation or interpretation in individual patients.

Purpose

FRAX is a widely accepted tool to estimate the 10-year risk of hip and major osteoporotic fracture in adults. Prior calibration studies suggest this works similarly with or without the inclusion of bone mineral density (BMD). The purpose of the study is to compare within-subject differences between FRAX estimations derived using DXA and Web software with and without the inclusion of BMD.

Method

A convenience cohort was used for this cross-sectional study, consisting of 1254 men and women aged between 40 and 90 years who had a DXA scan and complete validated data available for analysis. FRAX 10-year estimations for hip and major osteoporotic fracture were calculated using DXA software (DXA-FRAX) and the Web tool (Web-FRAX), with and without BMD. Agreements between estimates within each individual subject were examined using Bland–Altman plots. We performed exploratory analyses of the characteristics of those with very discordant results.

Results

Overall median DXA-FRAX and Web-FRAX 10-year hip and major osteoporotic fracture risk estimations which include BMD are very similar: 2.9% vs. 2.8% and 11.0% vs. 11% respectively. However, both are significantly lower than those obtained without BMD: 4.9% and 14% respectively, P < 0.001. Within-subject differences between hip fracture estimates with and without BMD were < 3% in 57% of cases, between 3 and 6% in 19% of cases, and > 6% in 24% of cases, while for major osteoporotic fractures such differences are < 10% in 82% of cases, between 10 and 20% in 15% of cases, and > 20% in 3% of cases.

Conclusions

Although there is excellent agreement between the Web-FRAX and DXA-FRAX tools when BMD is incorporated, sometimes there are very large differences for individuals between results obtained with and without BMD. Clinicians should carefully consider the importance of BMD inclusion in FRAX estimations when assessing individual patients.
Appendix
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Metadata
Title
Ireland DXA-FRAX may differ significantly and substantially to Web-FRAX
Authors
Lan Yang
Mary Dempsey
Attracta Brennan
Bryan Whelan
E. Erjiang
Tingyan Wang
Rebecca Egan
Kelly Gorham
Fiona Heaney
Catherine Armstrong
Guadalupe Morote Ibarrola
Amina Gsel
Ming Yu
John J. Carey
the DXA MAP Group
Publication date
01-12-2023
Publisher
Springer London
Published in
Archives of Osteoporosis / Issue 1/2023
Print ISSN: 1862-3522
Electronic ISSN: 1862-3514
DOI
https://doi.org/10.1007/s11657-023-01232-y

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