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. 2018 Feb 8;6(2):2325967117752623. doi: 10.1177/2325967117752623

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© The Author(s) 2018

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 License (http://www.creativecommons.org/licenses/by-nc-nd/4.0/) which permits non-commercial use, reproduction and distribution of the work as published without adaptation or alteration, without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 2. — Revision rates were calculated based on (A) the number of previous operative procedures on the knee joint, (B) the number of previous operative procedures on the cartilage defect, and (C) the number of accompanying operative procedures. Previous operative procedures on the knee joint appeared to be a risk factor for revision surgery after cartilage regenerative surgery, as significantly more revision surgeries were found for patients having undergone previous surgery of the knee joint (P = .0203). Cartilage surgery other than the index surgical procedure or other accompanying operative procedures such as meniscal surgery or correction of axis deviation did not appear to increase the risk for revision surgery.