Metal release from total hip articulations in vitro: Substantial from CoCr/CoCr, negligible from CoCr/PE and alumina/PE

Saikko, Vesa; Nevalainen, Juha; Revitzer, Hannu; Ylinen, Pekka

doi:10.3109/17453679808997777

Cited by 31 publications

(12 citation statements)

References 24 publications

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“…As a limitation of the present study it may be noted that the AAS and ICP-AES methods of measuring the Co and Co concentrations [14][15][16] were insensitive to the fact of whether the metals were in ionic or particular form in the used serum lubricant because of the acid digestion of the samples prior to the analysis. The total concentration was determined, but particles were not studied.…”

Section: Discussionmentioning

confidence: 99%

“…8). The wear in the MoM tests was evaluated from the Co and Cr concentrations of the used lubricant (HyClone Alpha Calf serum SH30212.03 diluted 1:1 with Milli-Q grade distilled water; no additives) by atomic absorption spectroscopy (AAS) and inductively coupled plasma atomic emission spectroscopy (ICP-AES) as described elsewhere [14][15][16]. The accuracy of the concentration measurements was ±2 per cent.…”

Section: Methodsmentioning

confidence: 99%

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Adverse condition testing with hip simulators

Saikko

2015

Biotribology

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Recent clinical failures and abnormal sounds observed in certain prosthetic hip designs have directed attention to adverse condition hip simulator testing. In the present study, hip simulator wear and friction tests were made with a macroscopic separation of the bearing surfaces in the swing phase, steep acetabular cup position, increased load, poor or lacking lubrication, roughened bearing surfaces including titanium third bodies, and with combinations of these. The only conditions that resulted in squeaking were dry sliding with alumina-on-alumina and metal-on-metal, and an extreme peak load of 4 kN with serum lubricated metal-on-metal. The wear rate of metal-on-metal increased by an order of magnitude when the cup position was steep, 64 degrees, compared with the optimal position of 48 degrees. The increase of the peak load from 2 kN to 3 kN with the cup position of 48 degrees increased the running-in wear of metal-on-metal, but the steady state wear rates were equally low, of the order of 1 mg per one million cycles. Crosslinked polyethylene was the superior cup material under adverse conditions, including dry sliding and roughened femoral head.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Adverse condition testing with hip simulators

Saikko

2015

Biotribology

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“…The wear was evaluated from the Co and Cr concentrations of the used lubricant analysed by atomic absorption spectroscopy (AAS) and inductively coupled plasma atomic emission spectroscopy (ICP-AES) as described elsewhere [1][2][3]21]. At intervals of 0.375 million cycles on the average the test was stopped, and the test chambers and the specimens were removed.…”

Section: Methodsmentioning

confidence: 99%

Effect of increased load on the wear of a large diameter metal-on-metal modular hip prosthesis with a high inclination angle of the acetabular cup

Saikko

2016

Tribology International

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This is an electronic reprint of the original article. This reprint may differ from the original in pagination and typographic detail. Author(s):Saikko, Vesa Title: Effect of increased load on the wear of a large diameter metal-on-metal modular hip prosthesis with a high inclination angle of the acetabular cup All material supplied via Aaltodoc is protected by copyright and other intellectual property rights, and duplication or sale of all or part of any of the repository collections is not permitted, except that material may be duplicated by you for your research use or educational purposes in electronic or print form. You must obtain permission for any other use. Electronic or print copies may not be offered, whether for sale or otherwise to anyone who is not an authorised user. AbstractIn some earlier hip simulator studies of large-diameter metal-on-metal (MoM) hip prostheses high, unexplained variation in wear has been observed. In the present study it was found that high variation occurs when the tribological endurance limit of the MoM device in question is being approached. When the limit is exceeded, high wear takes place uniformly, and the variation is low. Below the limit, both the wear and its variation are low. The endurance limit was exceeded by increasing the peak load from 2 kN to 3 kN, to simulate obesity. The acetabular cup inclination angle was high, 70°. Potential clinical wear problems can be predicted by hip simulator studies provided that relevant adverse test conditions are included.

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“…The wear of CrCo alloys is less than that of titanium and stainless steel. Although CrCo alloys are hard and tough, there is a constant metal release from prosthetic articulations; this, however, has been shown to be negligible for the articulation of PE on CoCr (214).…”

Section: Chromium-cobaltmentioning

confidence: 96%

Polyethylene wear analysis

Stilling

2009

Acta Orthopaedica

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Metal release from total hip articulations in vitro: Substantial from CoCr/CoCr, negligible from CoCr/PE and alumina/PE

Cited by 31 publications

References 24 publications

Adverse condition testing with hip simulators

Adverse condition testing with hip simulators

Effect of increased load on the wear of a large diameter metal-on-metal modular hip prosthesis with a high inclination angle of the acetabular cup

Polyethylene wear analysis

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