Low Wear Rates Seen in THAs With Highly Crosslinked Polyethylene at 9 to 14 Years in Patients Younger Than Age 50 Years

Titanium alloys are well known to present poor sliding behaviour and high wear values. Various coatings and treatments have been tested to prevent such an occurrence under fretting conditions at high frequency of displacement (100 Hz). An original test apparatus, using an open-loop system instead of a classical imposed displacement simulator, has been performed to directly display the phenomenon of seizure, defined as the stopping of the relative motion between the contacting elements. A classification of the tested coatings has been proposed on the basis of their capacity to maintain full or partial sliding conditions, to present low wear rates and to prevent seizure.

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A Tracer Method to Determine Extremely Low Wear Rates of Ultrahigh Molecular Weight Polyethylene

Journal of ASTM International ◽

10.1520/jai100253 ◽

2006 ◽

Vol 3 (9) ◽

pp. 100253 ◽

Cited By ~ 4

Author(s):

J Kunze ◽

MA Wimmer

Keyword(s):

Molecular Weight ◽

Ultrahigh Molecular Weight Polyethylene ◽

Tracer Method ◽

Wear Rates ◽

Ultrahigh Molecular Weight ◽

Low Wear

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Load Scenarios Influence Fluid Absorption of Polyethylene

World Tribology Congress III, Volume 2 ◽

10.1115/wtc2005-63578 ◽

2005 ◽

Author(s):

T. Schwenke ◽

C. Rieker ◽

M. A. Wimmer

Keyword(s):

Wear Testing ◽

Fluid Absorption ◽

Joint Replacements ◽

Wear Rates ◽

Total Joint Replacements ◽

Fluid Uptake ◽

Dynamically Loaded ◽

Low Wear ◽

Lubrication Conditions

Wear of total joint replacements is determined gravimetrically in simulator studies. A mix of bovine serum, distilled water, and additives is intended to replicate the lubrication conditions in-vivo. Weight gain due to fluid absorption during testing of UHMWPE components is corrected using a load soak station. In this study six sets of UHMWPE pins were tested for their fluid soak behavior. The samples were subjected to three different loading scenarios while being submersed in two types of commonly used lubricants. After two million cycles or 23.1 days, respectively, the different fluids lead to significantly different soaking results. Test groups that were dynamically loaded gained more weight than unloaded or statically loaded samples. The results suggest that dynamically loaded soak control stations are required during wear testing of UHMWPE components. Otherwise the fluid uptake masks the wear measurement, especially for new polyethylene materials with low wear rates. Furthermore, an agreement on detailed lubricant specifications is desirable.

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Advanced wear of an Oxinium™ femoral head implant following polyethylene liner dislocation

Annals of The Royal College of Surgeons of England ◽

10.1308/rcsann.2013.95.8.e4 ◽

2013 ◽

Vol 95 (8) ◽

pp. e4-e6 ◽

Cited By ~ 2

Author(s):

H Tribe ◽

S Malek ◽

J Stammers ◽

V Ranawat ◽

JA Skinner

Keyword(s):

Femoral Head ◽

Surface Coating ◽

Hip Dislocation ◽

Acetabular Cup ◽

Revision Procedure ◽

Wear Rates ◽

Soft Metal ◽

Low Wear

Oxinium™ (Smith & Nephew, Memphis, TN, US) has been used in hip arthroplasty since 2003. The surface coating is hard and provides low wear rates but if this surface coating is damaged, the soft metal core is at risk of accelerated wear. Previous reports have described accelerated wear following intra and postoperative hip dislocation. We report a case of advanced wear of an in situ Oxinium™ femoral head implant following a cracked acetabular liner. The liner had disengaged from the titanium shell, allowing the Oxinium™ head to articulate directly with the shell. The disengaged liner led to dislocation of the Oxinium™ head, with associated pronounced wear of the head and the acetabular cup. The patient had a successful revision procedure. We advise close follow-up of patients with Oxinium™ implants, especially if associated with dislocation and closed reduction.

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Determination of Low Wear Rates in Metal-On-Metal Hip Joint Replacements Based on Ultra Trace Element Analysis in Simulator Studies

Tribology Letters ◽

10.1007/s11249-009-9486-7 ◽

2009 ◽

Vol 37 (1) ◽

pp. 23-29 ◽

Cited By ~ 11

Author(s):

J. P. Kretzer ◽

M. Krachler ◽

J. Reinders ◽

E. Jakubowitz ◽

M. Thomsen ◽

...

Keyword(s):

Hip Joint ◽

Trace Element Analysis ◽

Element Analysis ◽

Joint Replacements ◽

Wear Rates ◽

Metal On Metal ◽

Low Wear ◽

Ultra Trace ◽

Hip Joint Replacements

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Tribological assessment of a flexible carbon-fibre-reinforced poly(ether—ether—ketone) acetabular cup articulating against an alumina femoral head

Proceedings of the Institution of Mechanical Engineers Part H Journal of Engineering in Medicine ◽

10.1243/09544119jeim334 ◽

2008 ◽

Vol 222 (3) ◽

pp. 273-283 ◽

Cited By ~ 49

Author(s):

S C Scholes ◽

I A Inman ◽

A Unsworth ◽

E Jones

Keyword(s):

Wear Rate ◽

Carbon Fibre ◽

Acetabular Component ◽

Volumetric Wear ◽

Wear Rates ◽

Lubrication Regime ◽

Ether Ether Ketone ◽

Poly Ether Ether Ketone ◽

Ether Ketone ◽

Low Wear

New material combinations have been introduced as the bearing surfaces of hip prostheses in an attempt to prolong their life by overcoming the problems of failure due to wear-particle-induced osteolysis. This will hopefully reduce the need for revision surgery. The study detailed here used a hip simulator to assess the volumetric wear rates of large-diameter carbon-fibre-reinforced pitch-based poly(ether—ether—ketone) (CFR-PEEK) acetabular cups articulating against alumina femoral heads. The joints were tested for 25×106 cycles. Friction tests were also performed on these joints to determine the lubrication regime under which they operate. The average volumetric wear rate of the CFR-PEEK acetabular component of 54 mm diameter was 1.16 mm3/106 cycles, compared with 38.6 mm3/106 cycles for an ultra-high-molecular-weight polyethylene acetabular component of 28 mm diameter worn against a ceramic head. This extremely low wear rate was sustained over 25×106 cycles (the equivalent of up to approximately 25 years in vivo). The frictional studies showed that the joints worked under the mixed—boundary lubrication regime. The low wear produced by these joints showed that this novel joint couple offers low wear rates and therefore may be an alternative material choice for the reduction of osteolysis.

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Extremely low wear rates in hip joint bearings coated with nanocrystalline diamond

Tribology International ◽

10.1016/j.triboint.2014.12.008 ◽

2015 ◽

Vol 89 ◽

pp. 72-77 ◽

Cited By ~ 11

Author(s):

M. Amaral ◽

M.M. Maru ◽

S.P. Rodrigues ◽

C.P. Gouvêa ◽

R.M. Trommer ◽

...

Keyword(s):

Hip Joint ◽

Nanocrystalline Diamond ◽

Wear Rates ◽

Low Wear

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Precision and Accuracy in Ceramic-on-Ceramic Wear Analyses: Influence of Simulator Test Duration

Proceedings of the Institution of Mechanical Engineers Part H Journal of Engineering in Medicine ◽

10.1243/095441105x34428 ◽

2005 ◽

Vol 219 (6) ◽

pp. 401-405 ◽

Cited By ~ 6

Author(s):

H A Richardson ◽

I C Clarke ◽

P Williams ◽

T Donaldson ◽

H Oonishi

Keyword(s):

Linear Regression ◽

Test Duration ◽

Wear Rates ◽

Average Wear ◽

Ceramic Implants ◽

Precision And Accuracy ◽

Low Wear ◽

Clinically Significant ◽

Simulator Test

In this, the first report of precision and accuracy in simulator studies, ceramic-ceramic implants with ultra-low wear trends represented a relevant wear model. The effect of test durations was examined in a standard simulator test mode on the quality of the linear regression trends, the average wear estimates, and the amount of noise in the data. Three sets of diametral tolerances were compared in 28 mm diameter alumina implants. The authors' hypothesis was that wear data would be significantly improved with increased test durations. The average wear rates varied little with test duration, the biggest change amounting to only 30 and 15 per cent decreases in the wear estimate by 10 and 14 million cycles respectively. The most satisfactory improvement in the study was the decrease in variance (noise) with increasing duration, ±200 per cent at 5 million cycles reduced to ±55 per cent at 14 million cycles. The quality of the linear regression coefficients improved 150 per cent by 10 million cycles and 250 per cent by 14 million cycles. Overall the ceramic implants with highest diametral tolerances showed the least wear (15 per cent less, but not statistically significant). However, given such low wear rates for alumina liners, it was unlikely that any differences owing to diametral tolerances would be clinically significant in the typical patient.

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