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. 2021 Jul 18;12(7):505–514. doi: 10.5312/wjo.v12.i7.505

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©The Author(s) 2021. Published by Baishideng Publishing Group Inc. All rights reserved.

This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/Licenses/by-nc/4.0/

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Sequential arthroscopic views of the anteromedial part of the femur above the cartilage with the arthroscope in the anterolateral portal. A: synovial hyperplasia; B: Palpation of the elevated synovial tissue with a probe; C: Removal of the synovial tissue reveals the altered tissue; D and E: After partial removal, the extensiveness of the altered tissue is revealed; F: The remaining crater after complete removal of the lesion.