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. 2019 Feb 4;12:10. doi: 10.1186/s13047-019-0318-1

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© The Author(s). 2019

Open AccessThis 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. 5 — Diagram depicting an abducted first MTPJ in the transverse plane. The dark grey circles represent the anatomical retro-reflective markers and the light grey circles represent the calculated midpoints. Note: MTB1, base of the first metatarsal (anatomical/tracking marker); MT1, head of first metatarsal (anatomical/calibration marker); MidMet, midpoint between MTB1 and MT1 (virtual marker); X_MET, a virtual marker on the end of the x-axis defined by the vector joining the metatarsal origin (MT1) and MTB1, and pointing anteriorly; HAL, middle of the dorsal aspect of the hallux nail (anatomical/tracking marker); MT5, head of the fifth metatarsal (anatomical/tracking marker); FTML, intermedius forefoot, mid-point between MT1 and MT5 (virtual marker)