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. 2021 Apr 14;16:256. doi: 10.1186/s13018-021-02400-x

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 3 — 3D PF-FNA. The lowest point of the greater trochanter on the 3D-PF model is located on the same horizontal plane as the medial and lateral condyles of the femur. The center of the femoral head and neck is positioned with a vernier caliper. The angle between these two points and the horizontal plane is measured by electronic angle instrument (called 3DPF-FNA)