Abstract
Summary
Magnetic resonance imaging (MRI) is a routine assessment before spine surgery. We found that the opportunistic use of MRI with the vertebral bone quality (VBQ) score has good diagnostic ability, with a threshold value of VBQ > 3.0, in recognizing patients who may need further osteoporosis evaluation.
Introduction
The purpose of this study was to determine whether the opportunistic use of magnetic resonance imaging (MRI) is useful for identifying spine surgical patients who need further osteoporosis evaluation.
Methods
This retrospective study evaluated 83 thoracolumbar spine surgery patients age ≥ 50 who received T1-weighted MRI. Opportunistic MRI was evaluated with the vertebral bone quality (VBQ) score, VBQ (fat) score, and signal-to-noise ratio (SNR). Each uses the median L1-L4 vertebral body signal intensities (SI) divided by either the L3 cerebrospinal fluid (CSF) SI, average SI of the L1 and S1 dorsal fat, or standard deviation (SD) of the background SI dorsal to the skin. Single-level VBQ was calculated as the ratio of the L1 vertebral body and L1 CSF SIs. Receiver-operator curve analysis was performed to determine diagnostic ability.
Results
The mean age was 70.10, 80% were female, and 96% were Caucasian. The mean ± SD VBQ, single-level VBQ, VBQ (fat), and SNR were 3.39 ± 0.68, 3.56 ± 0.81, 3.95 ± 1.89, and 113.18 ± 77.26, respectively. Using area under the curve, the diagnostic ability of VBQ, single-level VBQ, VBQ (fat), and SNR for clinical osteoporosis were 0.806, 0.779, 0.608, and 0.586, respectively. Diagnostic threshold values identified with optimal sensitivity and specificity were VBQ of 2.95 and single-level VBQ of 3.06.
Conclusion
Opportunistic use of MRI is a simple, effective tool that may help recognize patients who are at risk for complications related to bone disease. A VBQ > 3.0 can identify patients who need additional diagnostic evaluation.
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Data availability
The data generated and analyzed for this study are not openly available due to the datasets containing patient identifying information. The data are available from the corresponding author on reasonable request.
Code availability
Not applicable.
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Acknowledgements
We would like to thank Jennifer Wang for her assistance in creating the REDCap database and Scott Hetzel for his consultation on statistical methods.
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The University of Wisconsin’s IRB approved this retrospective study (2019–0420-CP003).
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Mr. Kadri and Dr. Binkley have nothing to disclose. Dr. Hernando is a co-founder of Calimetrix, LLC. Dr. Anderson reports personal fees from Radius Medical, Amgen, and Medtronic and stock interest in Titan Spine, outside of this submitted work.
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Kadri, A., Binkley, N., Hernando, D. et al. Opportunistic Use of Lumbar Magnetic Resonance Imaging for Osteoporosis Screening. Osteoporos Int 33, 861–869 (2022). https://doi.org/10.1007/s00198-021-06129-5
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DOI: https://doi.org/10.1007/s00198-021-06129-5