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. 2016 May 5;136:975–982. doi: 10.1007/s00402-016-2464-2

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© The Author(s) 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.

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Fig. 3 — Pain assessed on a numerical analog scale. For all parameters a non-parametric distribution was found (Kolmogorov–Smirnov-test, p < 0.05). a In both groups pain with walking improved over time (Friedman-test, p < 0.001). No between-groups differences could be detected (U test, p ≥ 0.05). b Pain at rest improved in both groups (Friedman-test, p < 0.001). No between-groups differences could be detected at any time point (U test, p ≥ 0.05). c In both groups pain during stair climbing improved significantly over time (Friedman-test, p < 0.001). Significant between-group differences could be detected after 6 (U test, p = 0.002) and 12 (p = 0.003) weeks of intervention. d Pain during sports improved in both groups over time (Friedman-test, p < 0.001). Significant between-group differences could be detected after 12 weeks of intervention (U test, p = 0.003)