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. 2019 Jan 22;20:36. doi: 10.1186/s12891-019-2407-5

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© The Author(s). 2019

Open Access This 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 — Mean change in ODI score. Mean change, decrease in ODI (with SD) from baseline to 12 months postoperative follow up. Exact values given in Table 2.

The patients are divided into four groups according to their preoperative Numeric Rating Scale (NRS) –score for lower extremity pain. Group 1 = NRS-score 0, 1 and 2, group 2 = NRS-score 3, 4 and 5, group 3 = NRS-score 6, 7 and 8 and group 4 = NRS-score 9 and 10 for lower extremity pain