Abstract:
:Aseptic loosening is the predominant cause of total hip implant failure. It has been assumed that a layer or membrane, containing macrophages, fibroblasts and vascular endothelial cells, of synovial-like tissue develops at the implant-to-bone interface almost invariably and, with time, somehow leads to loosening of the components from the surrounding bone. These cells produce a variety of cytokines and proteolytic enzymes which stimulate bone resorption. Platelet derived growth factor (PDGF) may be one of the cytokines which stimulate bone resorption and contribute to aseptic loosening in total hip replacement (THR). Synovial-like membrane from the implant or cement-to-bone interface (n = 10) and pseudocapsule (n = 10) were obtained from ten patients operated on for aseptic loosening of THR. As a control, nine samples of connective tissues were obtained from patients who had mandibular or maxillary fractures fixed with bone implant. The avidin-biotin-peroxidase complex (ABC) method with polyclonal rabbit anti-human IgG against the A-chain and B-chain of PDGF was used for staining. ABC-alkaline phosphatase-anti-alkaline-phosphatase double staining with monoclonal mouse anti-human fibroblast IgG1 and CD68 antibodies was used to ascertain the cellular origin of PDGF. Results of the PDGF staining were quantitated by a semi-automatic VIDAS image analysis system. The PDGF-A and PDGF-B chain containing cells were found in all periprosthetic tissues, in particular in macrophages with phagocytosed particulate debris, but to some extent also in fibroblasts and in endothelial cells. The numbers of PDGF-A and PDGF-B chain positive cells per mm 2 in synovial-like interface membrane (1881 +/- 486 and 1877 +/- 214) and pseudocapsule (1786 +/- 236 and 1676 +/- 152) were higher (P < 0.01) around loose THR than in control tissue (821 +/- 112 and 467 +/- 150), respectively. The results of the present study suggest that PDGF is preferably expressed by macrophages, which to an increased extent produce it in the synovial-like interface membrane and pseudocapsular synovial-like membrane. Because of its role in bone resorption, it may well play a role in periprosthetic bone loss and aseptic loosening and deserves more detailed study as a mediator and potential target in the modulation or prevention of loosening of THR.
journal_name
Rheumatol Intjournal_title
Rheumatology internationalauthors
Xu JW,Konttinen YT,Li TF,Waris V,Lassus J,Matucci-Cerinic M,Sorsa T,Santavirta TSdoi
10.1007/s002960050037subject
Has Abstractpub_date
1998-01-01 00:00:00pages
215-21issue
6eissn
0172-8172issn
1437-160Xjournal_volume
17pub_type
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journal_title:Rheumatology international
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