In Vivo Wear Performance of Cobalt-Chromium Versus Oxidized Zirconium Femoral Total Knee Replacements

Gascoyne, Trevor C.; Teeter, Matthew G.; Guenther, Leah; Burnell, Colin; Bohm, Éric; Naudie, Douglas

doi:10.1016/j.arth.2015.07.045

Cited by 20 publications

(15 citation statements)

References 31 publications

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“…There was no relationship found between the Hood scoring system of the PE component damage and the femoral component roughness measurements. These results match those presented in a recent study [16].…”

Section: Discussionsupporting

confidence: 93%

“…With a greater surface hardness and wettability than cobalt-chromium alloy (CoCr) [13], OxZr femoral components should theoretically lead to the reduction of PE wear. While in-vitro wear testing of OxZr TKRs has shown significant wear reduction when compared to CoCr TKRs [13][14][15], the 10-year clinical follow-up reviews reported no difference in survivorship or patient-reported outcome measures [16][17][18][19]. Further, the revision rates reported in both the NJR and the AOANJRR for Genesis II Oxinium are higher at 12 years than that of the standard CoCr Genesis II [1,3].…”

Section: Introductionmentioning

confidence: 99%

“…Gascoyne et al [16] used observer damage scoring and microcomputed tomography to quantify the damage observed on the articular surface of the PE inserts from the same cohort used by Brandt et al [21]. No significant difference was found between the PE damage of the two groups.…”

Section: Introductionmentioning

confidence: 99%

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A comparative surface topographical analysis of explanted total knee replacement prostheses: Oxidised zirconium vs cobalt chromium femoral components

Kennard

Scholes

Sidaginamale

et al. 2017

Medical Engineering & Physics

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It has been proposed that an increased surface roughness of the femoral components of Total Knee Replacements (TKRs) may be a contributing factor to the accelerated wear of the polyethylene (PE) bearing and ultimately prosthesis failure. Oxidised Zirconium was introduced to the orthopaedic market in an attempt to reduce PE wear associated failures and increase the longevity of the prosthesis. In this study, non-contacting profilometry was used to measure the surface roughness of the femoral components of 6 retrieved TKRs (3 Oxidised Zirconium (OxZr) and 3 Cobalt Chromium alloy (CoCr) femoral components) and 2 as-manufactured femoral components (1 OxZr and 1 CoCr). A semi-quantitative method was used to analyse the damage on the retrieved PE components. The S values for the retrieved OxZr femoral components (S = 0.093 µm ± 0.014) and for the retrieved CoCr femoral components (S = 0.065 µm ± 0.005) were significantly greater (p < .05) than the roughness values for the as-manufactured femoral components (OxZr S = 0.061 µm ± 0.004 and CoCr S = 0.042 µm ± 0.003). No significant difference was seen between the surface roughness parameters of the retrieved OxZr and retrieved CoCr femoral components. There was no difference between the PE component damage scores for the retrieved OxZr TKRs compared to the retrieved CoCr TKRs. These results agree with other studies that both OxZr and CoCr femoral components roughen during time in vivo but the lack of difference between the surface roughness measurements of the two materials is in contrast to previous topographical reports. Further analysis of retrieved OxZr TKRs is recommended so that a fuller appreciation of their benefits and limitations be obtained.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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A comparative surface topographical analysis of explanted total knee replacement prostheses: Oxidised zirconium vs cobalt chromium femoral components

Kennard

Scholes

Sidaginamale

et al. 2017

Medical Engineering & Physics

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“…These alloys are widely used in biomedical applications as they are the hardest known biocompatible alloys, and also possess good tensile and fatigue properties. They were initially applied to dental implant materials, and are now commonly used in artificial hip joints and knee joints due to their excellent corrosion resistance [ 1 , 2 , 3 ] and wear resistance [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Selective Laser Melting Process Parameters on Microstructure and Properties of Co-Cr Alloy

et al. 2018

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Due to the rapid melting and solidification mechanisms involved in selective laser melting (SLM), CoCrMo alloys fabricated by SLM differ from the cast form of the same alloy. In this study, the relationship between process parameters and the morphology and macromechanical properties of cobalt-chromium alloy micro-melting pools is discussed. By measuring the width and depth of the molten pool, a theoretical model of the molten pool is established, and the relationship between the laser power, the scanning speed, the scanning line spacing, and the morphology of the molten pool is determined. At the same time, this study discusses the relationship between laser energy and molding rate. Based on the above research, the optimal process for the laser melting of cobalt-chromium alloy in the selected area is obtained. These results will contribute to the development of biomedical CoCr alloys manufactured by SLM.

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“…Although in vivo wear measurements with total hip replacements have shown low wear rates, more studies have found no difference compared to cobalt chromium bearings than have shown an improvement with oxidized zirconium [5,6,11]. Results of studies examining retrieved total knee replacements have also been mixed, with some reporting improved wear resistance using oxidized zirconium while others show no difference when compared to cobalt chromium [1,4]. However, these studies have only been reported to a mid-term followup, and due to the well-established wear resistance of highly-crosslinked polyethylene it may be that followup will need to be into the second or even third decade before differences in wear rates become substantial.…”

mentioning

confidence: 99%

In Vivo Wear Performance of Cobalt-Chromium Versus Oxidized Zirconium Femoral Total Knee Replacements

Cited by 20 publications

References 31 publications

A comparative surface topographical analysis of explanted total knee replacement prostheses: Oxidised zirconium vs cobalt chromium femoral components

A comparative surface topographical analysis of explanted total knee replacement prostheses: Oxidised zirconium vs cobalt chromium femoral components

Effect of Selective Laser Melting Process Parameters on Microstructure and Properties of Co-Cr Alloy

CORR Insights®: Polyethylene Wear Increases in Liners Articulating With Scratched Oxidized Zirconium Femoral Heads

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