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Open Access 01-09-2019 | Osteoporosis | Musculoskeletal

Improved prediction of incident vertebral fractures using opportunistic QCT compared to DXA

Authors: Maximilian T. Löffler, Alina Jacob, Alexander Valentinitsch, Anna Rienmüller, Claus Zimmer, Yu-Mi Ryang, Thomas Baum, Jan S. Kirschke

Published in: European Radiology | Issue 9/2019

Abstract

Objectives

To compare opportunistic quantitative CT (QCT) with dual energy X-ray absorptiometry (DXA) in their ability to predict incident vertebral fractures.

Methods

We included 84 patients aged 50 years and older, who had routine CT including the lumbar spine and DXA within a 12-month period (baseline) as well as follow-up imaging after at least 12 months or who sustained an incident vertebral fracture documented earlier. Patients with bone disorders aside from osteoporosis were excluded. Fracture status and trabecular bone mineral density (BMD) were retrospectively evaluated in baseline CT and fracture status was reassessed at follow-up. BMD_QCT was assessed by opportunistic QCT with asynchronous calibration of multiple MDCT scanners.

Results

Sixteen patients had incident vertebral fractures showing lower mean BMD_QCT than patients without fracture (p = 0.001). For the risk of incident vertebral fractures, the hazard ratio increased per SD in BMD_QCT (4.07; 95% CI, 1.98–8.38), as well as after adjusting for age, sex, and prevalent fractures (2.54; 95% CI, 1.09–5.90). For DXA, a statistically significant increase in relative hazard per SD decrease in T-score was only observed after age and sex adjustment (1.57; 95% CI, 1.04–2.38). The predictability of incident vertebral fractures was good by BMD_QCT (AUC = 0.76; 95% CI, 0.64–0.89) and non-significant by T-scores. Asynchronously calibrated CT scanners showed good long-term stability (linear drift ranging from − 0.55 to − 2.29 HU per year).

Conclusions

Opportunistic screening of mainly neurosurgical and oncologic patients in CT performed for indications other than densitometry allows for better risk assessment of imminent vertebral fractures than dedicated DXA.

Key Points

• Opportunistic QCT predicts osteoporotic vertebral fractures better than DXA reference standard in mainly neurosurgical and oncologic patients.

• More than every second patient (56%) with an incident vertebral fracture was misdiagnosed not having osteoporosis according to DXA.

• Standard ACR QCT-cutoff values for osteoporosis (< 80 mg/cm ³ ) and osteopenia (≤ 120 mg/cm ³ ) can also be applied scanner independently in calibrated opportunistic QCT.

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Title: Improved prediction of incident vertebral fractures using opportunistic QCT compared to DXA
Authors: Maximilian T. Löffler
Alina Jacob
Alexander Valentinitsch
Anna Rienmüller
Claus Zimmer
Yu-Mi Ryang
Thomas Baum
Jan S. Kirschke
Publication date: 01-09-2019
Publisher: Springer Berlin Heidelberg
Keywords: Osteoporosis
Osteoporosis
Published in: European Radiology / Issue 9/2019
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-019-06018-w

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Improved prediction of incident vertebral fractures using opportunistic QCT compared to DXA

Abstract

Objectives

Methods

Results

Conclusions

Key Points

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Objectives

Methods

Results

Conclusions

Key Points

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