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. 2020 Mar 17;48(6):1793–1804. doi: 10.1007/s10439-020-02490-4

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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/.

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Sequence of operations used for decomposing a muscle volume mesh in an arbitrary number of fibres of user-defined resolution. A muscle surface mesh, in red, and attachment areas, outlined by the blue markers, are taken as input (a). The attachment sites are mapped on the muscle mesh, from which their projected area is removed. A scalar field is defined on the resulting surface (b) and as many isolines as the desired fibre points (c) are identified. A muscle architecture template (d), containing the number of fibres desired from the decomposition, is then mapped to the muscle mesh using planes corresponding to the isolines (e), so generating fibres that can be imported in a standard OpenSim model (f). In this example, the gluteus medius is discretised in 100 fibres, each one consisting of 15 straight-line segments.