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• W2116721904 startingPage "448" @default.
• W2116721904 abstract "The pathogenesis of aseptic loosening of total joint prostheses is not clearly understood. Two features are associated with loosened prostheses, namely, particulate debris and movement of the implant. While numerous studies have evaluated the cellular response to particulate biomaterials, few have investigated the influence of movement of the implant on the biological response to particles. Our aim was therefore to test the hypothesis that excessive mechanical stimulation of the periprosthetic tissues induces an inflammatory response and that the addition of particulate biomaterials intensifies this. We allocated 66 adult Beagle dogs to four groups as follows: stable implants with (I) and without (II) particulate polymethylmethacrylate (PMMA) and moving implants with (III) and without (IV) particulate PMMA. They were then evaluated at 2, 4, 6, 12 and 24 weeks. The stable implants were well tolerated and a thin, fibrous membrane of connective tissue was observed. There was evidence of positive staining in some cells for interleukin-6 (IL-6). Addition of particulate PMMA around the stable implants resulted in an increase in the fibroblastic response and positive staining for IL-6 and tumour necrosis factor-alpha (TNF-alpha). By contrast, movement of the implant resulted in an immediate inflammatory response characterised by large numbers of histiocytes and cytokine staining for IL-1beta, TNF-alpha and IL-6. Introduction of particulate PMMA aggravated this response. Animals with particulate PMMA and movement of the implant have an intense inflammatory response associated with accelerated bone loss. Our results indicate that the initiation of the inflammatory response to biomaterial particles was much slower than that to gross mechanical instability. Furthermore, when there was both particulate debris and movement, there was an amplification of the adverse tissue response as evidenced by the presence of osteolysis and increases in the presence of inflammatory cells and their associated cytokines." @default.
• W2116721904 created "2016-06-24" @default.
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• W2116721904 creator A5063754760 @default.
• W2116721904 creator A5089454602 @default.
• W2116721904 date "2001-04-01" @default.
• W2116721904 modified "2023-10-16" @default.
• W2116721904 title "Effect of PMMA particles and movement on an implant interface in a canine model" @default.
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• W2116721904 doi "https://doi.org/10.1302/0301-620x.83b3.10734" @default.
• W2116721904 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11341436" @default.
• W2116721904 hasPublicationYear "2001" @default.
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