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Open AccessArticle

Predictors of Response to a Medial Branch Block: MRI Analysis of the Lumbar Spine

1
Department of Anesthesiology and Pain Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05505, Korea
2
Department of Anesthesiology and Pain Medicine, Jun Orthopedic Hospital, Seoul 04790, Korea
3
Department of Anesthesiology and Pain Medicine, National Police Hospital, Seoul 05715, Korea
4
Department of Anesthesiology and Pain Medicine, Seoul ST. Mary’s Hospital, The Catholic University of Korea, Seoul 06591, Korea
*
Authors to whom correspondence should be addressed.
The authors contributed equally to this project as co-corresponding authors.
J. Clin. Med. 2019, 8(4), 538; https://doi.org/10.3390/jcm8040538
Received: 10 March 2019 / Revised: 16 April 2019 / Accepted: 17 April 2019 / Published: 19 April 2019
(This article belongs to the Section Anesthesiology)
The aim of this study was to determine the association between radiologic spinal pathology and the response to medial branches block (MBB). This retrospective observational study compared 165 patients. A successful response was defined as ≥30% or a 2-point reduction in the numeric rating scale (NRS) compared with the baseline at the 1-month follow-up. The facet angle, facet angle difference, facet joint degeneration, disc height and spondylolisthesis grade were analyzed from an MRI at the L3 to S1 levels. Univariate and multivariate logistic regression analyses were used to evaluate independent factors associated with a successful response of MBB. In the univariate analysis, the disc height at L5–S1 and facet angle difference at L3–4 were lower in the positive responders (p = 0.022 and p = 0.087, respectively). In the multivariate analysis, the facet angle difference at L3–4 and disc height at L5–S1 were independent factors associated with a successful response (odds ratio = 0.948; p = 0.038 and odds ratio = 0.864; p = 0.038, respectively). In patients with a degenerative disc at L5–S1, MBB can lead to a good response for at least one month. In patients with facet tropism at L3–4 level, the response to MBB after one month is likely to be poor. View Full-Text
Keywords: medial branch block; diagnostic medial branch block; facet joint pain; facet joint syndrome; facet joint tropism; facet angle; facet angle difference; intervertebral disc degeneration; low back pain medial branch block; diagnostic medial branch block; facet joint pain; facet joint syndrome; facet joint tropism; facet angle; facet angle difference; intervertebral disc degeneration; low back pain
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Park, J.-Y.; Kim, D.-H.; Seo, D.-K.; Yoon, S.-H.; Lee, G.; Lee, S.; Park, C.-H.; Sim, S.E.; Suh, J.-H. Predictors of Response to a Medial Branch Block: MRI Analysis of the Lumbar Spine. J. Clin. Med. 2019, 8, 538.

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