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. 2021 Sep 23;11:18906. doi: 10.1038/s41598-021-98463-1

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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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Two arthroscopic portals are created on either side of the probe (medial and lateral) in order to introduce the arthroscope and a blunt trocar. The trocar is used to create a working space around the notch: its tip is used to detach the soft tissue. The workspace gradually appears as a hypoechoic area. The arthroscope is then introduced under ultrasound guidance into the working area.