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. 2018 Mar 9;11:8. doi: 10.1186/s13047-018-0251-8

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© The Author(s) 2018

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License(http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. 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.

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Fig. 3 — Histograms and views of the first six PCs of the 3D foot shape in a healthy population. a The first principal component (visualized by the foot shapes along the PC 1 axis) is a contrast between high arched feet (low PC 1 sores) and flat feet (high PC 1 scores). b The second principal component (visualized by the foot shapes along the PC 2 axis) represents the differences between narrow ball width with touching toes (low PC 2 scores) and wide ball width with spread out toes (high PC 2 scores). c The third principal component (visualized by the foot shapes along the PC 3 axis) is a contrast between narrow feet (low PC 3 sores) and wide feet (high PC 3 scores). d The fourth principal component (visualized by the foot shapes along the PC 4 axis) represents the differences between feet with normal hallux bone (low PC 4 scores) and feet whose hallux bone is angled towards the other toes-hallux valgus (high PC 4 scores). e The fifth principal component (visualized by the foot shapes along the PC 5 axis) is a contrast between “Egyptian” foot type (low PC 5 sores) and “Greek” foot type (high PC 5 scores). f The sixth principal component (visualized by the foot shapes along the PC 6 axis) represents the differences between feet with a narrow midfoot with toes angled laterally (low PC 6 scores) and feet with a wide midfoot with toes angled medially (high PC 6 scores)