Does metal transfer differ on retrieved Biolox Delta composites femoral heads Surface investigation on three Biolox generations from a biotribological point of view.pdfVIP

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Does metal transfer differ on retrieved Biolox Delta composites femoral heads Surface investigation on three Biolox generations from a biotribological point of view.pdf

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Does metal transfer differ on retrieved Biolox Delta composites femoral heads Surface investigation on three Biolox generations from a biotribological point of view.pdf

Composites Part B 113 (2017) 164e173 Contents lists available at ScienceDirect Composites Part B journal homepage: /locate/compositesb Does metal transfer differ on retrieved Biolox? Delta composites femoral heads? Surface investigation on three Biolox? generations from a biotribological point of view Saverio Affatato a, *, Alessandro Ruggiero b, Massimiliano Merola b, Silvia Logozzo c a Medical Technology Laboratory, Rizzoli Orthopaedic Institute, Bologna, Italy b Department of Industrial Engineering, University of Salerno, Salerno, Italy c Department of Research and Development, V-GER S.r.l., Via Mori 6, Prunaro di Budrio, Bologna, Italy article info Article history: Received 16 December 2016 Received in revised form 12 January 2017 Accepted 22 January 2017 Available online 26 January 2017 Keywords: Biotribology Biolox? Delta Metal transfer Digital surface analysis Roughness abstract Background: Currently, little is known about the effects that metal transfer affecting hip implants may have on roughness. The main aim of this study is to propose a metrological technique in order to better characterize this phenomenon on the surface of composite ceramic femoral heads, discussing its in?uence on the biotribological behaviour of the coupling. In addition, through the acquired data, we investigate whether the metal transfer extension and roughness alterations on a femoral head is correlated to the material, the follow-up of the implant and whether metal transfer is associated with changes in the roughness of alumina surface, considering different follow-ups. Methods: Three generations of femoral heads manufactured in ceramic (Biolox?, Biolox? Forte, and Biolox? Delta) were retrieved from patients after different implantation periods (mean follow up ? 6.9 years) and they were analysed using a roughness tester and an optical non-contact 3D scanner, in order to characterize the metal transfer on the bearing surface. Results: Surface area where the metal transfer was obser