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. 2019 Dec 11;14:431. doi: 10.1186/s13018-019-1478-1

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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. 2 — Measurement with anteroposterior view of an X-ray. a measures the angle of anteversion, anteversion angle = arcsin (D1/D2); D1: short red line of the ellipse; D2: long blue line. b measures the angle of abduction. c shows the vertical and horizontal position of COR. A: vertical position of COR; B: horizontal position of COR