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Disuse histological changes of an unloading environment on joint components in rat knee joints

OBJECTIVES: To clarify the effects of mechanical unloading on joint components, including the articular cartilage by knee compartments, synovial membrane, and the infrapatellar fat pad (IFP), using a hindlimb suspension rat model. DESIGN: Twenty-five male rats were divided into the three following e...

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Autores principales: Takahashi, Ikufumi, Matsuzaki, Taro, Kuroki, Hiroshi, Hoso, Masahiro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9718232/
https://www.ncbi.nlm.nih.gov/pubmed/36474725
http://dx.doi.org/10.1016/j.ocarto.2019.100008
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author Takahashi, Ikufumi
Matsuzaki, Taro
Kuroki, Hiroshi
Hoso, Masahiro
author_facet Takahashi, Ikufumi
Matsuzaki, Taro
Kuroki, Hiroshi
Hoso, Masahiro
author_sort Takahashi, Ikufumi
collection PubMed
description OBJECTIVES: To clarify the effects of mechanical unloading on joint components, including the articular cartilage by knee compartments, synovial membrane, and the infrapatellar fat pad (IFP), using a hindlimb suspension rat model. DESIGN: Twenty-five male rats were divided into the three following experimental groups: the baseline, control (CON), and hindlimb unloading (HU) groups. Rats in the HU group were subjected to periods of hindlimb unloading by tail suspension. The joint components were evaluated by histopathological and histomorphometric analyses. RESULTS: The unloading condition caused articular cartilage thinning and decreased matrix staining. The tendency of these histological changes in articular cartilage was similar between the knee compartments. In general, the unloading environment resulted in no critical histological changes to the synovial membrane and IFP. At 4 weeks, thickening of the synovial membrane and synovial-like tissue invasion were observed in the HU group, but there was no significant change in inflammation. There was no obvious histological change to the IFP caused by unloading. CONCLUSION: The unloading environment caused disuse histological changes in the articular cartilage; however, the tendency of the changes was similar between compartments. Furthermore, the unloading condition caused no critical histological changes to the synovial membrane or IFP. Clinically, the unloading environment without joint immobilization over a short period may not have caused critical histological changes to the joint components.
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spelling pubmed-97182322022-12-05 Disuse histological changes of an unloading environment on joint components in rat knee joints Takahashi, Ikufumi Matsuzaki, Taro Kuroki, Hiroshi Hoso, Masahiro Osteoarthr Cartil Open Original Paper OBJECTIVES: To clarify the effects of mechanical unloading on joint components, including the articular cartilage by knee compartments, synovial membrane, and the infrapatellar fat pad (IFP), using a hindlimb suspension rat model. DESIGN: Twenty-five male rats were divided into the three following experimental groups: the baseline, control (CON), and hindlimb unloading (HU) groups. Rats in the HU group were subjected to periods of hindlimb unloading by tail suspension. The joint components were evaluated by histopathological and histomorphometric analyses. RESULTS: The unloading condition caused articular cartilage thinning and decreased matrix staining. The tendency of these histological changes in articular cartilage was similar between the knee compartments. In general, the unloading environment resulted in no critical histological changes to the synovial membrane and IFP. At 4 weeks, thickening of the synovial membrane and synovial-like tissue invasion were observed in the HU group, but there was no significant change in inflammation. There was no obvious histological change to the IFP caused by unloading. CONCLUSION: The unloading environment caused disuse histological changes in the articular cartilage; however, the tendency of the changes was similar between compartments. Furthermore, the unloading condition caused no critical histological changes to the synovial membrane or IFP. Clinically, the unloading environment without joint immobilization over a short period may not have caused critical histological changes to the joint components. Elsevier 2019-11-13 /pmc/articles/PMC9718232/ /pubmed/36474725 http://dx.doi.org/10.1016/j.ocarto.2019.100008 Text en © 2019 The Authors. Published by Elsevier Ltd on behalf of Osteoarthritis Research Society International (OARSI). https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Original Paper
Takahashi, Ikufumi
Matsuzaki, Taro
Kuroki, Hiroshi
Hoso, Masahiro
Disuse histological changes of an unloading environment on joint components in rat knee joints
title Disuse histological changes of an unloading environment on joint components in rat knee joints
title_full Disuse histological changes of an unloading environment on joint components in rat knee joints
title_fullStr Disuse histological changes of an unloading environment on joint components in rat knee joints
title_full_unstemmed Disuse histological changes of an unloading environment on joint components in rat knee joints
title_short Disuse histological changes of an unloading environment on joint components in rat knee joints
title_sort disuse histological changes of an unloading environment on joint components in rat knee joints
topic Original Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9718232/
https://www.ncbi.nlm.nih.gov/pubmed/36474725
http://dx.doi.org/10.1016/j.ocarto.2019.100008
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