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. 2017 Oct 16;18:415. doi: 10.1186/s12891-017-1775-y

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© The Author(s). 2017

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. 3 — Postoperative a VAS score, b numerical rating scale (NRS) score, and c performance score (PS).*P < 0.05, **P < 0.005, ****P < 0.0001, NS = not significant. Data were analyzed using the unpaired T test for (a). Data were analyzed using Mann–Whitney U test for (b) and (c)