Development and validation of a second-generation metal-on-metal bearing

Rieker, C; Schön, R.; Köttig, P.

doi:10.1016/j.arth.2004.09.017

Cited by 48 publications

(33 citation statements)

References 14 publications

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“…Tests lasting for longer time intervals than the run-in period will appear less severe than test stopped during of just after run-in. On the other hand, different conclusions on the effect of a certain parameter can be drawn depending on the number of cycles considered: for example in Rieker's study [2] when taking a short number of cycles clearance appears to promote wear while it has no significant effect after longer periods. Further, if one considers wear severity (wear coefficient or linear wear per cycle) instead of cumulative wear the effect of test duration becomes even more relevant with differences of one order of magnitude depending on considered number of cycles.…”

Section: Simulatorsmentioning

confidence: 99%

“…The degradation of metal-on-metal (mainly CoCrMo) artificial joints has been the object of an increasing number of scientific in-vitro investigations. Aspects such a lubrication, clearance, wear patterns and mechanical testing methods have been throughout analysed and reviews are available [2,[15][16][17]. Rieker et al [2] studied the relationship between clearance and linear wear rate for MoM bearings and found that the wear rate decreased with decreasing clearance down to a minimum value specific for a given particular design of the MoM articulation.…”

Section: Introductionmentioning

confidence: 99%

“…Aspects such a lubrication, clearance, wear patterns and mechanical testing methods have been throughout analysed and reviews are available [2,[15][16][17]. Rieker et al [2] studied the relationship between clearance and linear wear rate for MoM bearings and found that the wear rate decreased with decreasing clearance down to a minimum value specific for a given particular design of the MoM articulation. Existing lubrication and wear models have been reviewed by Mattei et al [16] who pointed out the need for more elaborate approaches including both phenomena and their interaction.…”

Section: Introductionmentioning

confidence: 99%

“…In order to overcome or minimize this problem alternative bearings such as Metal-on-Metal (MoM) prostheses, including CoCrMo components, have been developed. Second generation MoM bearings were introduced in the early 1990s and were manufactured with improved properties, mainly better clearance [2]. This led to better lubrication compared to first generation MoM articulations [3] and to 10-year survival rates generally exceeding 90%.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Wear of CoCrMo alloys used in metal-on-metal hip joints: A tribocorrosion appraisal

Mischler

Muñoz

2013

Wear

175

116

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a b s t r a c tA good biocompatibility, excellent mechanical properties and high corrosion resistance characterize CoCrMo alloys. Therefore they are widely used for artificial joints in biomedical implants. However, the degradation of the implants during service life leads to the release into the body of toxic ions and wear particles. This continuous degradation is of concern for long-term stability of the implants. Published literature has highlighted the relevance of lubrication as well as metallurgical and contact mechanical factors on the degradation of CoCrMo implant alloys. Recent experimental investigations have proposed tribocorrosion, i.e., the interplay of mechanical wear and corrosion by the body fluids, as one of the crucial degradation mechanism of implants. Tribocorrosion is sub-discipline of tribology and corrosion that recently made significant progresses in mechanistic understanding and modelling. The present work aims at evaluating published results on the degradation of CoCrMo alloys using existing tribocorrosion concepts. Results show that wear accelerated corrosion due to mechanical removal of the passive film during sliding is a major contribution to the overall degradation. Further, a transition from low (10 À 6 N/mm 3 m) to high (10 À 4 N/mm 3 m) wear coefficients was found at a threshold electrode potential close to 0.2 V SHE These findings clearly show that electrochemical phenomena play a key role on the tribological behaviour of biomedical CoCrMo alloy implants.

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Section: Simulatorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Wear of CoCrMo alloys used in metal-on-metal hip joints: A tribocorrosion appraisal

Mischler

Muñoz

2013

Wear

175

116

View full text Add to dashboard Cite

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“…7) However, the wear debris of MOP articulated prostheses, mostly generated from polyethylene particles by wearing due to abrasion by carbides precipitated in the CoCr-Mo alloy, has been correlated with particle-induced osteolysis and implant loosening. 8,9) As an alternative to MOP articulated prosthesis, Metal-on-Metal (MOM) articulated prostheses are increasingly gaining more acceptance, [10][11][12][13] since the wear rate of MOM (3.0 mm/year) is lower than that of MOP (100-200 mm/year). 14,15) The forged Co-Cr-Mo alloy without any Ni and C added has a fine grained microstructure and has higher mechanical properties than conventional Co-Cr-Mo alloys.…”

Section: Introductionmentioning

confidence: 99%

Effect of Dissolved Oxygen Content on Pin-on-Disc Wear Behavior of Biomedical Co-Cr-Mo Alloys in a Like-on-Like Configuration in Distilled Water

2007

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The wear behavior of a forged Co-29Cr-6Mo alloy without any Ni and C added has been investigated by using a tribosystem consisting of a pin-on-disc type wear testing machine in distilled water containing different dissolved oxygen content. Dissolved oxygen content in the distilled water was controlled by aerating with oxygen or by deaerating with argon. Wear volume in the distilled water containing high oxygen content is approximately two times larger than in that containing low oxygen content. Accordingly, it is deduced that the overall wear volume is significantly affected by the dissolved oxygen content in the distilled water surrounding the tribosystem. Although abrasive wear, caused by wear debris, is operative as a wear mechanism in the present tribosystem irrespective of oxygen content, the transfer of the wear debris to sliding surfaces, as well as the aggregation of the wear debris on the sliding surfaces, is more prone to occur during the wear process with the lower oxygen content. Therefore, in the present tribosystem with the lower oxygen content, since the transfer of the wear debris to the disc or the pin readily occurs, the generation of the wear debris does not directly contribute to the wear volume, leading to the apparently lower wear volume in the tribosystem with lower oxygen content than in that with higher oxygen content; the transfer of the wear debris is not counted as wear loss because the wear volume is estimated based on the loss in disc and pin weight that occurs during the wear test.

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Rheological behavior of noncompatibilized and compatibilized PP/PET blends with SEBS‐g‐MA

Kordjazi

Ebrahimi

2009

J of Applied Polymer Sci

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The rheological behaviors of noncompatibilized and compatibilized polypropylene/polyethylene terephthalate blends (80/20) in relation with their morphology were studied at two constant levels using maleic anhydridemodified styrene-ethylene-butylene-styrene polymer. By scanning electron microscopy of cryofractured surfaces, the morphology of the blends was examined after etching. The frequency sweep and step strain experiments were carried out for the blends. The frequency sweep results indicated that increasing the compatibilizer causes behavioral changes of the rheological properties, which could be related to the aggregation of the dispersed particles with rubbery shell. Also, the frequency sweep and step strain experiments in linear region, after cessation of simple steady shear flow with various preshear rates (higher shear stress values than G 0 p ), were done on compatibilized blend. The results showed that the morphology characteristics, defined by the aggregation of the dispersed particles based on rheological experimental data, were destroyed and replaced by an alignment in the flow direction for present imposed shear rates.

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Development and validation of a second-generation metal-on-metal bearing

Cited by 48 publications

References 14 publications

Wear of CoCrMo alloys used in metal-on-metal hip joints: A tribocorrosion appraisal

Wear of CoCrMo alloys used in metal-on-metal hip joints: A tribocorrosion appraisal

Effect of Dissolved Oxygen Content on Pin-on-Disc Wear Behavior of Biomedical Co-Cr-Mo Alloys in a Like-on-Like Configuration in Distilled Water

Rheological behavior of noncompatibilized and compatibilized PP/PET blends with SEBS‐g‐MA

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