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. 2016 Aug 27;17(1):372. doi: 10.1186/s12891-016-1209-2

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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. 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 normalised muscle activation during early the stance phase (15-25 %) for (a) vastus lateralis (VL), (b) vastus medialis (VM), (c) biceps femoris and (d) semitendinosus. Healthy participant data is shown in dark grey, baseline knee OA data in white and post-AT knee OA data in light grey. Plots (e) and (f) show lateral/medial co-contraction, calculated as the sum of hamstring and quadriceps activity and horizontal bars denotes significant differences (p < 0.01). Note that statistical testing was only performed on the measures of co-contraction