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. 2021 Jun 24;11:13284. doi: 10.1038/s41598-021-92685-z

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© The Author(s) 2021

Open Access This 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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Specimen preparation: (a) shows the location of the samples within the available bone region. The drill penetrates into the diaphysis with an angle of 20°–30° in lateral direction, starting from the fovea capitis. In (b) a femoral head fixed in the clamping jaws can be seen immediately after drilling. The fovea capitis is visible in (b) as a yellow and dark red spot below the drill hole. The already cut drill core can be seen in (c). The parts are arranged from proximal (top) to distal (bottom).