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. 2015 Oct 20;6(6):591–600. doi: 10.1007/s13244-015-0438-5

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© The Author(s) 2015

Open Access This 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. 10 — The horizontal centre of rotation is defined as the distance between the centre of the femoral head (point C) and the lateral outline of the teardrop shadow. The vertical centre of rotation is defined as the distance between the centre of the femoral head (point C) and the transischial tuberosity line (line D)