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. 2019 Feb 4;12:10. doi: 10.1186/s13047-019-0318-1

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© The Author(s). 2019

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. 1 — Sagittal view of a dancer purposely demonstrating forced turnout in first position. Dancers usually position their feet in an exaggerated turnout angle in demi-plie (a), a dancer maintains this angle while extending through the knees (b), into a forced turnout double leg up-right posture in first position (c). The dancer is also demonstrating poor knee-foot alignment (c)