Vertebral bone quality score provides preoperative bone density assessment for patients undergoing lumbar spine surgery: a retrospective study
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OBJECTIVE
The novel MRI-based vertebral bone quality (VBQ) score has been described as an opportunistic screening tool for osteoporosis, but the stability and practical value of this score deserve further investigation. The purpose of this study was to assess whether preoperative VBQ scores could assist in identifying reduced bone mineral density (BMD) or osteoporosis and evaluating the consistency between MRI systems with different field strengths.
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The VBQ scores of the patients who underwent surgery for lumbar disc herniation and the single-level VBQ scores of each L1–4 vertebral body were measured and calculated with preoperative lumbar MRI noncontrast T1-weighted phases. The VBQ scores were evaluated for correlation analysis using dual-energy x-ray absorptiometry (DEXA) T-scores. The receiver operating characteristic (ROC) curve was used to evaluate the ability of the VBQ scores to identify patients with reduced BMD and with osteoporosis. Differences in CSF measurements at different levels of L1–4 were compared. Twenty-four patients who had been examined using another MRI machine were used as controls to test the interdevice agreement of the VBQ scores.
RESULTS
The study included 100 patients with mean VBQ scores of 2.81 ± 0.28 (normal BMD), 3.06 ± 0.36 (osteopenia), and 3.43 ± 0.37 (osteoporosis). VBQ scores differed significantly between BMD subgroups (p < 0.001). The Pearson correlation coefficient showed a moderate negative linear correlation between novel VBQ scores and the lowest DEXA T-scores (r = −0.524). ROC analysis showed good discrimination of VBQ scores in patients with reduced BMD (area under the curve [AUC] 0.793) and with osteoporosis (AUC 0.810). The diagnostic thresholds of reduced BMD and osteoporosis according to the maximum Youden index were 3.06 (sensitivity 0.636, specificity 0.870, positive predictive value [PPV] 0.942, negative predictive value [NPV] 0.417) and 3.05 (sensitivity 0.875, specificity 0.618, PPV 0.519, NPV 0.913), respectively. CSF measurements at the L2, L3, and L4 levels were essentially identical and did not significantly affect the final VBQ scores (p > 0.05), whereas CSF measurements at the L1 level were found to be heterogeneous (p < 0.001). No significant differences were found in VBQ scores between the same brand of MRI machines at different field strengths (1.5 and 3.0 T, p = 0.107).
CONCLUSIONS
The new VBQ score provides an additional screening opportunity for preoperative BMD assessment. A VBQ score < 3.05 essentially excludes osteoporosis, whereas a VBQ score ≥ 3.05 (especially ≥ 3.06) suggests the need for further examination. The VBQ score is comparable between different MRI systems.
ABBREVIATIONS
AUC = area under the curve ; BMD = bone mineral density ; DEXA = dual-energy x-ray absorptiometry ; FA = fractional anisotropy ; ICC = intraclass correlation coefficient ; 净现值=负面预测值 ; PPV = positive predictive value ; ROC = receiver operating characteristic ; ROI = region of interest ; SI = signal intensity ; TBS = trabecular bone score ; VBQ = vertebral bone quality .Supplementary Materials
- Supplementary Fig. 1 (PDF 1,599 KB)
Approaching the debate of laminectomy versus fusion for grade 1 lumbar spondylolisthesis, the authors leveraged simulation to show how differences between the fusion groups of landmark randomized control trials (RCTs) led to seemingly divergent conclusions, and they offer insights into the design of future RCTs. Lami = laminectomy alone; SLIP = Spinal Laminectomy versus Instrumented Pedicle Screw. See the article in this issue by Meade et al. (pp 696–704). Reprinted with permission, Cleveland Clinic Foundation ©2023. All rights reserved.
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