title: Wear debris and cytokine production in the interface membrane of loosened prostheses.
abstract: In this study, thirty-nine patients were examined. All of them suffered from hip joint prostheses loosening and underwent revision surgery. Bioptic samples were collected at the interface between bone and implant either at the stem or cotyle level. Immunohistochemistry was performed to detect IL-1alpha, IL-1beta, IL-6 and TNF, cytokines that directly cause bone resorption and indirectly induce synthesis of other bone resorbing cytokines. Quantitative analysis of the positive cells and correlation with clinical data was performed. It resulted that there is a great variability in positive cells for cytokines according to the harvest site; anyway, cytokines tend to be higher in patients carrying a joint prosthesis with polyethylene acetabular component and it is associated with plastic wear particles, even though there is no direct correlation between wear amount and cytokine levels. There is a statistically significant negative correlation between metal wear and a cytokine (IL-6); cytokines levels do not depend on the implant time to failure and do not correlate with pain score. As expected, cytokines levels tend to be lower in subjects being treated with non-steroidal antiinflammatory drugs. It can be concluded that plastic wear is the factor inducing the highest cytokine levels in the tissues around the prosthesis at the interface; cytokines that are an indicator of osteolysis risk.
authors: Laboratory for Biocompatibility Research on Implant Materials, Istituti Ortopedici Rizzoli, Bologna, Italy.
authors: S
authors: S
authors: Stea
authors: M
authors: M
authors: Visentin
authors: D
authors: D
authors: Granchi
authors: C
authors: C
authors: Melchiorri
authors: S
authors: S
authors: Soldati
authors: A
authors: A
authors: Sudanese
authors: A
authors: A
authors: Toni
authors: L
authors: L
authors: Montanaro
authors: A
authors: A
authors: Pizzoferrato
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D001843:Bone Cements / Q000378:metabolism; D016207:Cytokines / Q000096:biosynthesis*; D005260:Female; D006621:Hip Joint / Q000166:cytology / Q000187:drug effects; D006801:Humans; D007150:Immunohistochemistry; D007375:Interleukin-1 / Q000096:biosynthesis / Q000378:metabolism; D015850:Interleukin-6 / Q000096:biosynthesis / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D014018:Tissue Distribution; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis / Q000276:immunology / Q000378:metabolism
chemical_list: D001843:Bone Cements; D016207:Cytokines; D007375:Interleukin-1; D015850:Interleukin-6; D014409:Tumor Necrosis Factor-alpha