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Retrieval analysis of metal and ceramic femoral heads on a single CoCr stem design

Di Laura, A; Hothi, H; Henckel, J; Swiatkowska, I; Liow, MHL; Kwon, Y-M; Skinner, JA; (2017) Retrieval analysis of metal and ceramic femoral heads on a single CoCr stem design. BONE & JOINT RESEARCH , 6 (5) pp. 345-350. 10.1302/2046-3758.65.BJR-2016-0325.R1. Green open access

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Abstract

Objectives: The use of ceramic femoral heads in total hip arthroplasty (THA) has increased due to their proven low bearing wear characteristics. Ceramic femoral heads are also thought to reduce wear and corrosion at the head-stem junction with titanium (Ti) stems when compared with metal heads. We sought to evaluate taper damage of ceramic compared with metal heads when paired with cobalt chromium (CoCr) alloy stems in a single stem design. Methods: This retrieval study involved 48 total hip arthroplasties (THAs) with CoCr V40 trunnions paired with either CoCr (n = 21) or ceramic (n = 27) heads. The taper junction of all hips was evaluated for fretting/corrosion damage and volumetric material loss using a roundness-measuring machine. We used linear regression analysis to investigate taper damage differences after adjusting for potential confounding variables. Results: We measured median taper material loss rates of 0.210 mm3/year (0.030 to 0.448) for the metal head group and 0.084 mm3/year (0.059 to 0.108) for the ceramic group. The difference was not significant (p = 0.58). Moreover, no significant correlation between material loss and implant or patient factors (p > 0.05) was found. Conclusions: Metal heads did not increase taper damage on CoCr trunnions compared with ceramic heads from the same hip design. The amount of material released at the taper junctions was very low when compared with available data regarding CoCr/Ti coupling in metal-on-metal bearings.

Type: Article
Title: Retrieval analysis of metal and ceramic femoral heads on a single CoCr stem design
Open access status: An open access version is available from UCL Discovery
DOI: 10.1302/2046-3758.65.BJR-2016-0325.R1
Publisher version: http://dx.doi.org/10.1302/2046-3758.65.BJR-2016-03...
Additional information: © 2017 Di Laura et al. This is an open-access article distributed under the terms of the Creative Commons Attributions licence (CC-BY-NC), which permits unrestricted use, distribution, and reproduction in any medium, but not for commercial gain, provided the original author and source are credited.
Keywords: Science & Technology, Life Sciences & Biomedicine, Cell & Tissue Engineering, Orthopedics, Cell Biology, Hip prostheses, Ceramic femoral heads, Metal femoral heads, TOTAL HIP-ARTHROPLASTY, LARGE-DIAMETER METAL, LOCAL TISSUE-REACTIONS, IN-VIVO CORROSION, FRETTING CORROSION, TAPER JUNCTION, PSEUDOTUMOR FORMATION, MODULAR JUNCTIONS, NECK TAPER, PROSTHESES
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci > Department of Ortho and MSK Science
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1558531
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