The influence of contact stress on the wear of cross-linked polyethylene

Kandemir, Göksu; Smith, Simon; Joyce, Thomas J.

doi:10.1177/0954411918796047

Cited by 9 publications

(9 citation statements)

References 32 publications

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“…Encouraging results were reported by Saikko [19,21] (table 1) in terms of wear and oxidation resistance for VitEXLPE compared to conventional irradiated and heat treated UHMWPE. Interestingly, the wear rate of VitEXLPE was found to decrease with an increase in the contact area which is in contrast with what was observed for UHMWPE and XLPE [22,23].…”

Section: Introductioncontrasting

confidence: 85%

“…To aid comparison of the wear rates of UHMWPE, XLPE and VitEXLPE, the rheological behaviour of newborn calf serum (dilution ratio: 1:2, protein concentration: 22 g/L) which was used in the studies conducted by Harsha and Joyce [36] and Kandemir et al [23]…”

Section: Resultsmentioning

confidence: 99%

“…For the other groups, the viscosity values of the CMC fluids were higher (0.056 to 0.155 Pas), and the machining marks were still present after 2.5 million cycles of testing. The Using data from previous studies, [23] and [36] that used newborn calf serum (dilution ratio: 1:2) as the test lubricant, the wear rates of UHMWPE, XLPE and VitEXLPE were compared (figure 9). Group 1 VitEXLPE pins were selected to be used for comparison.…”

Section: Discussionmentioning

confidence: 99%

“…The wear test used the 50-station multidirectional SuperCTPOD (figure 2). The machine and its working principle have been explained in detail elsewhere [23,[35][36][37]. Five groups of VitEXLPE pins were tested against 5 groups of CoCr discs using CMC fluids as test lubricants.…”

Section: Wear Testmentioning

confidence: 99%

“…The assemblies (figure 2b) followed an elliptical orbital motion under a constant load of 70.7 N, which corresponded to 1.11 MPa of nominal contact stress. The wear track path was set to 12 x 10 mm which was previously used in studies [23,36] which tested the wear behaviours of XLPE and UHMWPE. This pin-on-disc device enabled a continuous change of the direction of sliding of the discs relative to the pins.…”

Section: Wear Testmentioning

confidence: 99%

See 4 more Smart Citations

How does lubricant viscosity affect the wear behaviour of VitE-XLPE articulated against CoCr?

Kandemir

Smith

Chen

et al. 2020

Journal of the Mechanical Behavior of Biomedical Materials

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Section: Introductioncontrasting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Wear Testmentioning

confidence: 99%

Section: Wear Testmentioning

confidence: 99%

See 3 more Smart Citations

How does lubricant viscosity affect the wear behaviour of VitE-XLPE articulated against CoCr?

Kandemir

Smith

Chen

et al. 2020

Journal of the Mechanical Behavior of Biomedical Materials

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Effect of type of contact, counterface surface roughness, and contact area on the wear and friction of extensively cross‐linked, vitamin E stabilized UHMWPE

Saikko

2019

J Biomed Mater Res

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Novel extensively cross-linked, vitamin E stabilized polyethylene (VEXLPE) materials are expected to provide improved wear and oxidation resistance in orthopedic implants. Noncyclic, multidirectional pin-on-disk (POD) wear tests were performed for VEXLPE with flat-on-flat (FoF) and ball-on-flat (BoF) specimen configurations against CoCr counterfaces of varying surface roughness (S a = 0.02-0.74 μm). In addition, wear tests (FoF) were performed for VEXLPE pins of varying nominal contact area (7.07-113 mm 2 ) with consistent load regimen against polished CoCr disks. All specimen couples were also friction tested with a multidirectional, circularly translating POD device. In all tests, calf serum was used as the lubricant. In comparison with earlier, similar tests for conventional, gamma-sterilized ultra-high molecular weight polyethylene (UHMWPE) and for extensively cross-linked, heat treated UHMWPE (XLPE), the tribological findings for the present VEXLPE appeared promising with respect to its possible clinical use in prosthetic joints, particularly as an acetabular liner against large-diameter femoral heads, and in nonconforming contacts. Contrary to the well-known, paradoxical behavior of conventional UHMWPE, the VEXLPE wear factor decreased with increasing contact area. K E Y W O R D S biomedical devices, extensively cross-linked UHMWPE, noncyclic pin-on-disk, vitamin E stabilization

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Anomalous Wear Behavior of UHMWPE During Sliding Against CoCrMo Under Varying Cross-Shear and Contact Pressure

et al. 2022

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Wear of ultra-high-molecular weight polyethylene (UHMWPE) in joint implant applications has been shown to increase with cross-shear (CS, i.e., multidirectional sliding) but decrease with higher contact pressure (CP). Moreover, structural changes, resulting in protrusions, are known to occur to the surface of the pin following multidirectional sliding. However, these phenomena are not yet fully understood. In this study, we simultaneously varied CP and CS to derive an empirical formula for the wear factor as a function of these parameters. The wear factor increased when going from unidirectional sliding to multidirectional sliding but decreased with increasing CP, as has been previously observed. Following these tests, the protrusions on the pin surface were chemically and mechanically characterized to gain insights into both their origin and influence on wear behavior. Micro-FT-IR confirmed that the structures consist of polyethylene, rather than adsorbed, denatured proteins. It also allowed the crystallinity of both the protrusions and unaffected UHMWPE to be estimated, showing a strong positive correlation with the hardness of these different areas on the surface. Time-of-flight secondary-ion mass spectrometry was used to probe the chemistry of the surface and near-surface region and indicated the presence of contamination from the test fluid within the structure. This suggests that the protrusions are formed by the folding of UHMWPE following plastic deformation. It is also suggested that the higher hardness of the protrusions affords some protection of the surface, leading to the observed anomalous behavior, whereby wear increases with decreasing CP. Graphical Abstract

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The influence of contact stress on the wear of cross-linked polyethylene

Cited by 9 publications

References 32 publications

How does lubricant viscosity affect the wear behaviour of VitE-XLPE articulated against CoCr?

How does lubricant viscosity affect the wear behaviour of VitE-XLPE articulated against CoCr?

Effect of type of contact, counterface surface roughness, and contact area on the wear and friction of extensively cross‐linked, vitamin E stabilized UHMWPE

Anomalous Wear Behavior of UHMWPE During Sliding Against CoCrMo Under Varying Cross-Shear and Contact Pressure

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