Abstract
Objective
The aim of this study was to investigate the role of quantitative ultrasound (QUS) of the calcaneus in screening for osteoporosis in adults with axial spondyloarthropathy (axSpA).
Method
Postmenopausal women and men over 50 years with axSpA were recruited for this observational cross-sectional study. Dual-energy x-ray absorptiometry (DXA) assessed bone mineral density (BMD) of the spine and hip. QUS of the calcaneus produced broadband ultrasound attenuation (BUA), speed of sound (SOS), stiffness index (SI), and T-scores. Receiver-operating characteristics (ROC) curve analysis determined the ability of QUS to discriminate between low and normal BMD. Thresholds were identified to (1) out rule low BMD, (2) identify osteoporosis, and (3) identify low BMD. The number of DXAs which could be avoided using this approach was calculated.
Results
56 participants were analyzed. BUA, SI, and T-score QUS parameters correlated with BMD by DXA; SOS did not. All QUS parameters had the ability to discriminate between low and normal BMD (area under the curve varied from 0.695 to 0.779). QUS identified individuals without low BMD with 90% confidence, with BUA performing best (sensitivity 93%, negative predictive value 86%). Using QUS as a triage tool, up to 27% of DXA assessments could have been avoided. QUS could not confidently identify individuals with osteoporosis.
Conclusions
QUS of the calcaneus confidently out ruled low BMD in individuals with axSpA, reducing the need for onward DXA referral by up to 27%. QUS is promising as a non-invasive triage tool in the assessment of osteoporosis in adults with axSpA.
Key Points • Osteoporosis is common in axial spondyloarthropathy (SpA), but evaluation of bone health is suboptimal in this population. • Quantitative ultrasound (QUS) of the calcaneus can out rule low bone mineral density in individuals with axial SpA, reducing the need for DXA assessment. • QUS is a promising non-invasive triage tool in the assessment of bone health in axial SpA. |
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Acknowledgments
We would like to thank all the patients who willingly gave up their time to participate in the study. We would also like to also thank the staff of the Rheumatology Department in Tallaght University Hospital for their expertise and enthusiasm in assisting with patient recruitment. Additionally, we would like to express our deep gratitude to all the staff of the bone clinic in St. James’s Hospital.
Funding
We would like to acknowledge that the corresponding author (GF) was a recipient of the Bresnihan-Molloy Scholarship from the Royal College of Physicians of Ireland, funded by AbbVie pharmaceuticals. However, AbbVie pharmaceuticals had no role in the design of the study, collection of the data, analysis, and interpretation of the data or any part of manuscript preparation.
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Data from this manuscript has been published as an abstract in conference proceedings: Fitzgerald G, Anachebe T, Mullan R, Kane D, McCarroll K, O'Shea F. Quantitative Ultrasound of the Calcaneus Has a Role to Play in Detecting Low Bone Mineral Density in Axial Spondyloarthropathy Patients [abstract]. Arthritis Rheumatol. 2018; 70 (suppl 10). https://acrabstracts.org/abstract/quantitative-ultrasound-of-the-calcaneus-has-a-role-to-play-in-detecting-low-bone-mineral-density-in-axial-spondyloarthropathy-patients/. Accessed October 28, 2019.
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Fitzgerald, G.E., Anachebe, T., McCarroll, K.G. et al. Calcaneal quantitative ultrasound has a role in out ruling low bone mineral density in axial spondyloarthropathy. Clin Rheumatol 39, 1971–1979 (2020). https://doi.org/10.1007/s10067-019-04876-9
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DOI: https://doi.org/10.1007/s10067-019-04876-9