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. 2022 Aug 30;23:823. doi: 10.1186/s12891-022-05771-2

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© The Author(s) 2022

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. 2 — Examples of PPP, PPG, and PGA at the 2^nd metatarsal head in a representative participate. A PPP = 436 kPa and PPG = 37 kPa/mm. The PPP and PPG were not at the same point. B PPP was during the stance phase of gait. C PPG was during the stance phase of gait. D PGA was the angle change of the pressure gradient vector, which was instantaneous PPP more than half of the overall PPP. PGA = 17.5°. PPP, peak plantar pressure; PPG, peak pressure gradient; PGA, pressure gradient angle