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. 2020 Sep 2;21:15. doi: 10.1186/s10195-020-00551-x

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© The Author(s) 2020

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/.

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Fig. 3 — a Mechanical axis (Maquet’s line) is a line from center of femoral head (A) to center of ankle (B); b Hip-knee-ankle axis is the angle between mechanical axis of femur (A to center of knee, C) and mechanical axis of tibia (C to B); c Tibial component coronal alignment is the angle between the line perpendicular to the mechanical axis of tibia and coronal axis of tibial component