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Association between MRI findings and back pain after osteoporotic vertebral fractures: a multicenter prospective
Sayed Abdullah Ahmadi1, Shinji Takahashi1, Masatoshi Hoshino1
1Department of Orthopaedic Surgery, Osaka City University Graduate School of Medicine, Osaka, Japan.
Background Context:
Osteoprotic vertebral fractures (OVFs) are common in elderly people. The association between back pain due to OVF with magnetic resonance imaging (MRI) signal change is unclear. In this study we hypothesized that MRI findings would be a predictive factor for back pain measured by visual analogue scale (VAS) at 6 months follow-up.
Purpose:
The aim was to study the MRI findings that predict back pain after OVF and the association between radiological findings and scores of back pain.
Study Design:
Multicenter prospective cohort study.
Patient Sample:
A total of 153 OVF patients.
Outcome Measure:
The outcome measures were VAS back pain and MRI signal change.
Methods:
This study was performed from 2012 to 2015. Consecutive patients with less than 2-week-old OVFs at 11 institutions were enrolled prospectively. MRI was performed at enrollment and at 1, 3, and 6 months follow-up. T1- and T2-weighted images (T1WI and T2W1) were obtained at each time point and their association with VAS scores of back pain at 6 months were investigated. Anterior compression ratio, posterior compression ratio, and angular motion of vertebral bodies were also measured on X-rays at each follow-up. This research had no financial support. There are no conflicts of interest.
Result:
The 6 months follow-up was completed by 153 patients. At enrollment, the average VAS score of back pain was 75 mm, and it had improved at the 6-month follow-up to an average score of 20 mm. There was a significant correlation between T1 diffuse low signal change and VAS scores at the 6-month follow-up (p<.01). T2 high signal changes (odds ratio; 4.01, p<.01) and old vertebral fractures (odds ratio; 2.47, p=.04) were independent risk factors for back pain. The correlation between angular motion of vertebrae on X-rays and the VAS score of back pain was significant at all time points.
Conclusion:
This study demonstrates the radiological factors associated with persistent back pain after an OVF and the association between the VAS score of back pain and radiological findings. In addition, T2 high signal changes in acute phase and old vertebral fractures were independent risk factors for residual back pain.
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