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. 2022 Apr 23;12:6694. doi: 10.1038/s41598-022-10600-6

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© The Author(s) 2022

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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Severity mapping of osteoarthritic femoral heads. (A) Outerbridge classification used for grading cartilage lesions. (B) Schematic illustration of 36 regions for scoring cartilage lesion severity. (C–E) Femoral heads representing cartilage lesion severity of various grades. (C) Non-OA femoral head from a 77 year old female patient with normal articular cartilage. OA femoral head from a 52 year old female patient representing grades 1 and 2 (D), and 3 and 4 (E).