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. 2020 Jul 1;7:46. doi: 10.1186/s40634-020-00262-6

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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. 1 — Alignment of the bone models. In green the hip-, knee-, and ankle-center. In black the axis connecting the hip- and ankle-center. a The bone model is oriented in an antero-posterior (AP) view. b The bone model is internally rotated by 90° to obtain a lateral view. The knee was controlled for full extension in a way that the plumb line from the hip- to the ankle-center passes exactly through the knee-center