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. 2020 May 19;11:180. doi: 10.1186/s13287-020-01670-2

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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/. 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 in a credit line to the data.

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Fig. 3 — The repair area was smooth and full in the ACCC group. Gross morphology of the femoral condyle, the counterpart meniscus and the tibia platform and the results of International Cartilage Repair Society (ICRS) scoring system. a The red-dotted circles show the defects and the repair area; the black arrows and the black bars indicate the torn meniscus and a 1-cm scale, respectively. b ICRS scoring system for macroscopic evaluation of cartilage repair, ICRS-ORA, ICRS-overall repair assessment; ICRS-MA, ICRS-macroscopic appearance; ICRS-IBZ, ICRS-integration to border zone; ICRS-DDR, ICRS-degree of defect repair; n = 6, data are expressed as the mean ± standard deviation; black circles, black squares, black triangles and black stars indicate significant differences between the ACCC and the BC, AC, ACAC and ACWJ groups, respectively. P < 0.05 indicates a statistically significant difference