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. 2019 Dec 14;20:607. doi: 10.1186/s12891-019-2989-y

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Comparison of an arthroscopic assessment at initial operation and at the time of second-look operation. a Patient of group 1 showed preexisting cartilage lesions on patellofemoral joint (patella; ICRS grade III cartilage lesions with about 15x15mm size, trochlea; ICRS grade III cartilage lesions with about 5x20mm size), b which were observed to be progressed at second-look operation (patella; ICRS grade III cartilage lesions with about 15x15mm size, trochlea; ICRS grade III cartilage lesions with about 20x25mm size). c Patient of group 2 without any preexisting cartilage lesions on patellofemoral joint d showed development of cartilage lesions at second-look operation (trochlea; ICRS grade III cartilage lesions with about 3x15mm size). ICRS International Cartilage Repair Society