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. 2018 May 24;19:164. doi: 10.1186/s12891-018-2086-7

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© The Author(s). 2018

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. 8 — Percentage of MRI grade of disc degeneration in vacuum phenomenon shape type and distribution analyses. The percentage of MRI grade (Pfirrmann’s classification [10]) of disc degeneration in vacuum phenomenon (VP) shape type (a) and distribution (b) analyses. *P < 0.0025, ^#P < 0.002 (by Bonferroni correction). The percentage of advanced degenerative stage discs (Pfirrmann grades IV and V) of each group is indicated by a bracket