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. 2021 Apr 15;13:21. doi: 10.1186/s13089-021-00224-8

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© The Author(s) 2021

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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Fig. 2 — Ultrasound of rectus femoris muscle. Ultrasound images of the muscular layers were obtained, and the muscle thickness of the rectus femoris was measured by drawing a perpendicular line from the border lines of the rectus femoris to the border lines of the vastus intermedius. On the screen of the US (ultrasonography) device, muscle thickness was calculated by setting the cursor to two points from the border lines of the rectus femoris to the border lines of vastus intermedius. Top arrow: rectus femoris muscle; middle arrow: vastus intermedius muscle; bottom arrow: femur