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. 2021 Jan 14;11:1391. doi: 10.1038/s41598-021-81009-w

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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/.

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Typical ankle trajectory before (in frame E) and after transformation (in frame P). This transformation allows visualising the trajectory and computing the spatial gait parameters. Stride length is defined as the displacement in the anterior-posterior direction; shank vertical displacement is defined as the maximum displacement in the superior-inferior direction.