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. 2016 Feb 9;11:9. doi: 10.1186/s13013-016-0062-2

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© Samartzis et al. 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Axial MRI noting assessment of facet joint angulation. The images note patients with facet joint a) tropism and b) non-tropism. Asymmetry of the left and right facet joint angulations greater or equal to 8° angulation was defined as tropism