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. 2022 Nov 7;23:960. doi: 10.1186/s12891-022-05937-y

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© The Author(s) 2022

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. 4 — Histopathological images of the rat’s knee in the vehicle and DF-HA groups a and b Vehicle group, and c and d DF-HA group. Scale bars, 400 μm. a and c Hematoxylin–eosin staining. b and d Safranin O (SO) staining. a and c White arrows indicate significant cartilage loss in both groups. b and d Little cartilages are stained red with SO. b and d Red-stained areas are irregularly fragmented and distributed deep in the remaining cartilage layer (sections surrounded by a red frame)