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. 2017 Jan 11;18:14. doi: 10.1186/s12891-016-1372-5

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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. 2 — Association between BMI and and pre-THA/TKA pain/function among US (FORCE) and Swiss (Geneva) patients. Lower scores represent greater pain/poorer function. a. association pre-TKA WOMAC pain; b. pre-THA WOMAC pain; c. pre-TKA WOMAC function; d. pre-THA WOMAC function. The association between function and BMI in (c). (TKA) is significantly different between countries (P < 0.046)