A New Screening Method Designed for Wear Analysis of Bearing Surfaces Used in Total Hip Arthroplasty

Wimmer, Matthias; Nassut, R; Lampe, Frank; Schneider, Erich; Mm, Morlock

doi:10.1520/stp12828s

Cited by 8 publications

(5 citation statements)

References 6 publications

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“…In each testing unit, the pins and the hip ball described an oscillating moveformed using acceleration voltages of 1 or 20 kV, whereas backscattered electron (BSE) imaging and ment of ±30°at 1 Hz in a 90°phase difference, creating elliptical motion trajectories on the contact qualitative energy-dispersive X-ray analysis were carried out at acceleration voltages of 5 and 20 kV. surfaces [14]. The contact force was set to a constant 750 N (basic body weight), thus achieving a nominal For an acceleration voltage of 1 kV, the penetration of the incident electron beam is in the range of a few compression of 6.5 MPa.…”

Section: Figmentioning

confidence: 99%

“…In order to undertake the specified measurement task (friction and wear quantification), a customwhere MOM bearings were considerably more sensitive to motion interruption (with an increase in fricmade wear simulator was used for the experimental part of this investigation [14]. The so-called 'pin-ontion of up to 260 per cent) than any other material combination tested.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on stick phenomena in metal-on-metal hip joints after resting periods

Wimmer

Nassutt

Sprecher

et al. 2006

Proc Inst Mech Eng H

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Insufficient understanding of tribological behaviour in total joint arthroplasty is considered as one of the reasons for prosthesis failure. Contrary to the continuous motion input profiles of hip simulators, human locomotion contains motion interruptions. These occurring resting periods can cause stick phenomena in metal-on-metal hip joints. The aim of the present study was to investigate the tribological sensitivity of all-metal bearings to motion interruptions on in vitro test specimens and retrieved implants. Friction and wear with and without resting periods were quantified. Unlike the metal-on-polyethylene joints, the static friction of metal-on-metal joints increased up to micros = 0.3 with rest, while wear appeared to be unaffected. This effect is caused by the interlocking of firmly adhered carbon layers, which were generated from the protein-containing lubricant through tribochemical reactions. Since more than 80 per cent of the retrieved implants exhibited macroscopically visible carbon layers, the increase in friction presumably also occurs under physiological conditions, which is then transferred to the bone-implant interface. These recurrent tangential stress peaks should be considered for the design features of the cup-bone interface, in particular when larger-sized implant heads are used.

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Section: Figmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on stick phenomena in metal-on-metal hip joints after resting periods

Wimmer

Nassutt

Sprecher

et al. 2006

Proc Inst Mech Eng H

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“…In order to take the special joint geometry and contact kinematics into account, a custom-made screening device was used for this investigation (Wimmer, 1998). This so-called ªPin-on-Ballº testing device has two testing pins per unit, one on each side, which press equatorially onto a hip ball placed between them (Fig.…”

Section: Methodsmentioning

confidence: 99%

Friction and Wear Properties of Metal/Metal Hip Joints

Wimmer

Artelt

Schneider

et al. 2001

Mat.-wiss. u. Werkstofftech.

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Insufficient understanding of tribological behaviour of total joint components is considered as one of the major reasons for premature prosthesis failure. In the previous years, wear modes and mechanisms of artificial hips have been intensively studied using testing machines applying continuous motion and load profiles. Human locomotion, however, is of erratic shape containing motion interruptions among other irregularities. These occurring resting phases could influence adhesive friction at the artificial articulation with possible effects on wear and loosening. Initial frictional behaviour after resting periods and subsequent wear of metal‐on‐metal hip components have been investigated. While the initial frictional moment of artificial hip components was found to increase significantly with increasing resting duration, wear was hardly affected. These results therefore rather point to an interlocking phenomenon than adhesion. Still, the results are of concern because the increase in friction is likely to occur under physiological conditions too and may cause tangential stress peaks at the bone/ implant interface accelerating fatigue failure. In particular, big head sizes should be used with caution because the frictional moment is a function of coefficient of friction and ball diameter.

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“…Polished concave pins of defined clearance are rotated and slid against a head under bovine serum lubrication (BCS, SigmaAldrich, St. Louis, MO, USA) at 37 °C (Thermostat Julabo F25, Julabo Labortechnik GmbH, Seelbach, Germany) by means of a pin-on-ball wear test [19,20]. The interface motion is generated by sine-wave type axial oscillation of both the pins and the ball.…”

Section: Laboratory Tribosystem and Analysesmentioning

confidence: 99%

On the Growth Rate of Tribomaterial in Bovine Serum Lubricated Sliding Contacts

et al. 2016

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Considering total hip arthroplasty, so-called tribolayers (aka tribomaterial), consist of carbonaceous material from the periprosthetic joint fluid or bovine serum mixed with nanometer size metal and oxide wear particles. Currently, its growth sequence and rate are unknown. Thus, smooth surfaces of low-Carbon (LC-) vs. high-Carbon (HC-)CoCrMo (Cobalt-Chromium-Molybdenum) alloys have been worn in a conforming contact under bovine serum lubrication by means of a pin-on-ball wear tester. These tests were interrupted at certain numbers of cycles in order to weigh the specimens, characterize the topography, and investigate the wear appearances. In addition, after cleaning in ethanol and anionic detergent, before-and-after comparison rendered the weight of the tribomaterial. This revealed that, during run-in, the specimens gained weight by generating tribomaterial. Afterwards the loss of material surpassed the generation of new tribomaterial and a steady weight-loss was measured. Topography measurements were used as input data for contact mechanics calculations. Apparently the incipient, locally high contact stresses accelerated tribochemical reactions. After run-in, the contact situation changes and leads to a much smaller generation rate. This paper provides information about the growth sequence and rate of such tribomaterial formation. It further highlights the significance of highly localized contact stress as an important factor for tribomaterial generation.

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A New Screening Method Designed for Wear Analysis of Bearing Surfaces Used in Total Hip Arthroplasty

Cited by 8 publications

References 6 publications

Investigation on stick phenomena in metal-on-metal hip joints after resting periods

Investigation on stick phenomena in metal-on-metal hip joints after resting periods

Friction and Wear Properties of Metal/Metal Hip Joints

On the Growth Rate of Tribomaterial in Bovine Serum Lubricated Sliding Contacts

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