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Publisher DOI: 10.1371/journal.pone.0135517
Title: Quantification of the contact area at the head-stem taper interface of modular hip prostheses
Language: English
Authors: Witt, Florian 
Gührs, Julian 
Morlock, Michael 
Bishop, Nicholas 
Issue Date: 17-Aug-2015
Publisher: PLOS
Source: PLOS ONE 8 (10): e0135517- (2015)
Journal or Series Name: PLOS ONE 
Abstract (english): Corrosion of modular taper junctions of hip implants may be associated with clinical failure. Taper design parameters, as well as the intraoperatively applied assembly forces, have been proposed to affect corrosion. Fretting corrosion is related to relative interface shear motion and fluid ingress, which may vary with contact force and area. It was hypothesised in this study that assembly forces modify the extent and distribution of the surface contact area at the taper interface between a cobalt chrome head and titanium stem taper with a standard threaded surface profile. Local abrasion of a thin gold coating applied to the stem taper prior to assembly was used to determine the contact area after disassembly. Profilometry was then used to assess permanent deformation of the stem taper surface profile. With increasing assembly force (500 N, 2000 N, 4000 N and 8000 N) the number of stem taper surface profile ridges in contact with the head taper was found to increase (9.2±9.3%, 65.4±10.8%, 92.8±6.0% and 100%) and the overall taper area in contact was also found to increase (0.6±0.7%, 5.5±1.0%, 9.9±1.1% and 16.1±0.9%). Contact was inconsistently distributed over the length of the taper. An increase in plastic radial deformation of the surface ridges (-0.05±0.14 μm, 0.1±0.14 μm, 0.21±0.22 μm and 0.96±0.25 μm) was also observed with increasing assembly force. The limited contact of the taper surface ridges at lower assembly forces may influence corrosion rates, suggesting that the magnitude of the assembly force may affect clinical outcome. The method presented provides a simple and practical assessment of the contact area at the taper interface.
DOI: 10.15480/882.2252
ISSN: 1932-6203
Institute: Biomechanik M-3 
Type: (wissenschaftlicher) Artikel
Funded by: This publication was supported by the German Research Foundation (DFG) and the Hamburg University of Technology (TUHH) in the funding program Open Access Publishing. We are grateful for material support by DePuy-Synthes.
Appears in Collections:Publications (tub.dok)

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