Magnetic resonance imaging

Liu, Wei; Fan, Jin; Bai, Jianling; Tang, Pengyu; Chen, Jian; Luo, Yi; Zhou, Kuai; Wei-hua, Cai

doi:10.1097/md.0000000000008194

Cited by 12 publications

(17 citation statements)

References 14 publications

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“…A high T1s was related to postoperative kyphotic changes after laminoplasty 11) and loss of correction in adult spinal deformity surgery. 23) Despite the importance of T1s, it has poor measurement accuracy due to anatomical interference 20) and the reproducibility of the measurement is also low. 24 26) Previous studies reported only 11% had a clear boundary in XR images.…”

Section: Discussionmentioning

confidence: 99%

“… 27) However, if there is segmental kyphosis at C7/T1, C7s cannot be substituted for T1s. Liu et al, 20) suggest that the correlation between MR and XR measurements is very high and that replacement is possible by predicting MR (MR-E) through a regression equation. 20) However, this analysis was insufficient to evaluate the possibility of replacement.…”

Section: Discussionmentioning

confidence: 99%

“…Compared to standing lateral radiographs, supine advanced imaging such as computed tomography or magnetic resonance (MR), can clearly show specific anatomical landmarks and allow for accurate measurements. 20) However, because MR imaging is performed in a supine position, the possibility of substituting one measurement for the other is questionable. Liu et al, 20) suggested that MR results could be a comparable alternative to XR results by using a simple linear regression equation which would convert MR measurements to XR results that would correlate accurately.…”

Section: Introductionmentioning

confidence: 99%

“… 20) However, because MR imaging is performed in a supine position, the possibility of substituting one measurement for the other is questionable. Liu et al, 20) suggested that MR results could be a comparable alternative to XR results by using a simple linear regression equation which would convert MR measurements to XR results that would correlate accurately. However, the statistical analyses were insufficient to evaluate all alternatives.…”

Section: Introductionmentioning

confidence: 99%

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Can Supine Magnetic Resonance Imaging Be an Alternative to Standing Lateral Radiographs for Evaluating Cervical Sagittal Alignment?

Bae

Son

Lee

et al. 2020

Korean J Neurotrauma

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Objective Recently, many studies have reported that cervical alignment is related to clinical outcomes. However, poor visibility of anatomical structures during X-ray (XR) imaging limits accurate measurements. In supine magnetic resonance (MR) imaging, the boundary of the anatomical structure is clear, but the correlation to XR images taken in a standing position is problematic. In this study, we evaluated the agreement of sagittal alignment parameters between MR and XR measurements. Methods We retrospectively reviewed 268 patients. Cervical sagittal parameters were measured using XR and MR images, and their relationships were evaluated using Pearson's correlation, paired t -tests, and 2-way random, single score intraclass correlation coefficient (ICCs) (2,1). Using simple linear regression analysis, MR results were converted to the expected value (MR-E). The subsequent comparison of MR-Es with XRs was used to examine whether MR-Es could replace XRs when the measurement difference was less than 2 mm or 2°. Results The correlation between the MR and XR measurements was high, but ICCs showed low reliability. All parameters were significantly different between XR and MR measurements in paired t -tests. Converting the MR values eliminated the t -test differences between MR-Es and XRs, but did not affect correlations and ICCs. The replacement ratio included the Cobb angle: 20.3%, T1: 27.1%, the sagittal vertical axis: 17.6%, C1–2: 29.7%, and C2: 16.0%. Conclusion These results indicate that supine MR measurements could not replace upright XR measurements.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Can Supine Magnetic Resonance Imaging Be an Alternative to Standing Lateral Radiographs for Evaluating Cervical Sagittal Alignment?

Bae

Son

Lee

et al. 2020

Korean J Neurotrauma

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“…From lateral cervical, whole spine X-rays and MRI scans, 16 cervical sagittal balance parameters, including C2-7 cervical lordosis (CL), C2-7 sagittal vertical axis (SVA), T1 slope, neck tilt, and thoracic inlet angle (TIA), were measured by blinded, independent, orthopedic spine surgeons on 2 occasions (intraclass correlation ¼ 0.912, P value ¼ 0.002). These parameters were previously proven to be correlated with surgical outcomes.…”

Section: Evaluation Of Radiologic Parameters and Functional Outcomesmentioning

confidence: 99%

Anterior Plate-Screws and Lower Postoperative T1 Slope Affect Cervical Allospacer Failures in Multi-Level ACDF Surgery: Anterior Versus Posterior Fixation

Suk

Jimenez

et al. 2021

Global Spine Journal

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Study Design: Prospective observational study. Objective: In ACDF, graft failure and subsidence are common complications of surgery. Depending on the cervical fixation, different biomechanical characteristics are applied on the grafts. This aims to describe the incidence of cervical spacer failure in patients with cervical degenerative condition according to the cervical fixation method and sagittal balance. Method: From November 2011 to December 2015, 262 patients who underwent cervical spine surgery were enrolled prospectively. Patients were divided into 3 groups based on fixation method: anterior plate/screw (APS), posterior lateral mass screw (LMS), pedicle screw (PPS) groups. Serial X-rays and CT scans were utilized to evaluate radiologic outcomes. Results: Mean patient ages were 56.1 years in the APS group, 61.5 years in the LMS group, and 57.6 years in the PPS group ( P = 0.002). Allospacer failure was most common in the APS group, compared to the LMS and PPS groups (chi-square, P = 0.038). Longer fusion level was associated with greater allospacer failure (Baseline 2 level surgery; Odds ratio (OR) 3.4 in 3 level, 15.2 in 4 level, P = 0.036,0.013). Higher T1 slope was correlated with less allospacer failure (OR 0.875, P = 0.001). ORs of allospacer failure in the LMS and PPS groups were 0.04 and 0.02, respectively, ( P = 0.01, 0.01), compared with the APS group. Conclusion: This study was able to show that allospacer failure in multi-level ACDF surgery is more common with a longer fusion length, less postoperative T1 slope, and an anterior plate-screws technique. Pedicle screws provided the best biomechanical stability among the 3 constructs.

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