Abstract
Background
Despite progress in surgical techniques, 1% to 2% of joint arthroplasties become complicated by infection. Coating implant surfaces with antimicrobial agents have been attempted to prevent initial bacterial adhesion to implants with varying success rates. We developed a silver ion-containing calcium phosphate-based ceramic nanopowder coating to provide antibacterial activity for orthopaedic implants.
Questions/purposes
We asked whether titanium prostheses coated with this nanopowder would show resistance to bacterial colonization as compared with uncoated prostheses.
Methods
We inserted titanium implants (uncoated [n = 9], hydroxyapatite-coated [n = 9], silver-coated [n = 9]) simulating knee prostheses into 27 rabbits’ knees. Before implantation, 5 × 102 colony-forming units of Staphylococcus aureus were inoculated into the femoral canal. Radiology, microbiology, and histology findings were quantified at Week 6 to define the infection, microbiologically by increased rate of implant colonization/positive cultures, histologically by leukocyte infiltration, necrosis, foreign-body granuloma, and devitalized bone, and radiographically by periosteal reaction, osteolysis, or sequestrum formation.
Results
Swab samples taken from medullary canals and implants revealed a lower proportion of positive culture in silver-coated implants (one of nine) than in uncoated (eight of nine) or hydroxyapatite-coated (five of nine) implants. Silver-coated implants also had a lower rate of colonization. No cellular inflammation or foreign-body granuloma was observed around the silver-coated prostheses.
Conclusions
Silver ion-doped ceramic nanopowder coating of titanium implants led to an increase in resistance to bacterial colonization compared to uncoated implants.
Clinical Relevance
Silver-coated orthopaedic implants may be useful for resistance to local infection but will require in vivo confirmation.
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Acknowledgments
The authors thank Ulukan Inan MD and Sinan Seber MD of the Department of Orthopaedics and Traumatology, Faculty of Medicine, Eskişehir Osmangazi University, Eskişehir, Turkey, for help in designing the study and interpreting our results. We also thank Cengiz Bayçu PhD and Dilek Burukoglu PhD for help with the histopathologic analysis and Summani Demirci DVM from our institutional animal laboratory for help with our efforts and in caring for the animals during the research period.
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Each author certifies that he or she, or a member of his or her immediate family, has no commercial associations (eg, consultancies, stock ownership, equity interest, patent/licensing arrangements, etc) that might pose a conflict of interest in connection with the submitted article.
All ICMJE Conflict of Interest Forms for authors and Clinical Orthopaedics and Related Research editors and board members are on file with the publication and can be viewed on request.
Each author certifies that his or her institution approved the animal protocol for this investigation and that all investigations were conducted in conformity with ethical principles of research.
This work was performed at Osmangazi University, Eskisehir, Turkey.
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Kose, N., Otuzbir, A., Pekşen, C. et al. A Silver Ion-doped Calcium Phosphate-based Ceramic Nanopowder-coated Prosthesis Increased Infection Resistance. Clin Orthop Relat Res 471, 2532–2539 (2013). https://doi.org/10.1007/s11999-013-2894-x
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DOI: https://doi.org/10.1007/s11999-013-2894-x