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. 2018 Sep 15;13:236. doi: 10.1186/s13018-018-0922-y

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© The Author(s). 2018

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 — Diagram showing the radiographic parameters measured. L1 is the trans-teardrop line. L2 is the line between the teardrop and the acetabular edge. L3 is the line connecting the femoral head center and the acetabular edge. L4 is the vertical line at the femoral head center. The ilioischial line is the line connecting the lateral borders of the greater sciatic notch and obturator foramen. Sharp acetabular (SA) angle is the angle between L1 and L2, whereas center-edge angle (CEA) is the angle between L3 and L4. D is the distance between the medial femoral head and ilioischial line, which represents lateralization