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. 2020 Jun 17;21:438. doi: 10.1186/s12891-020-03373-4

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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/. 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. 5 — Deviation of osteotomy angle. Outliers > 5° are given in percentage for each setup. Left: Osteotomy angle for both surgeons. The results for AR (mean angle 4.1°) and freehand osteotomies (mean angle 6.1 °) did not differ significantly (p = 0.2), but the variability of imprecision is less with AR-support. Middle: Osteotomy angle for the experienced surgeon. The results for the AR (mean angle 3.4°) and freehand (mean angle 2.8°) osteotomies did not differ significantly (p = 0.2). right: Osteotomy angle for the inexperienced surgeon. The osteotomy angle for the AR (mean angle 6.4°) differed significantly (p = 0.02) less from the plane perpendicular to the second metatarsal than the freehand osteotomies (mean angle 10.5°). Also the variability of imprecision is higher without AR-support