Effect of CoCr Counterface Roughness on the Wear of UHMWPE in the Noncyclic RandomPOD Simulation

Saikko, Vesa; Vuorinen, Vesa; Revitzer, Hannu

doi:10.1115/1.4033648

Cited by 8 publications

(12 citation statements)

References 23 publications

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“…As the present wear results regarding the counterface surface roughness are compared with an earlier, similar study with a conventional, gamma‐nitrogen‐sterilized (25 to 40 kGy) UHMWPE (“Sulene‐PE”) and an electron‐beam‐irradiated (95 kGy) and melted (150 °C) XLPE (“Durasul”), (Saikko et al, ) it can be stated that Hypothesis 1 was supported by the results (Figure ). The result is logical as the extent of crosslinking of the present VEXLPE is likely to be between those of Sulene‐PE and Durasul (Oral et al, ).…”

Section: Discussionsupporting

confidence: 77%

“…The wear ranking is similar to that of the present Wear test no. 1 (FoF) results grouped together with Saikko et al () (Figure ), but the difference between VEXLPE and XLPE in the hip simulator study is smaller, and the difference between VEXLPE and conventional UHMWPE is larger. This may be attributable to the different methods of crosslinking.…”

Section: Discussionmentioning

confidence: 57%

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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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Section: Discussionsupporting

confidence: 77%

Section: Discussionmentioning

confidence: 57%

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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“…The difference may somewhat affect the lubricant ingress into the contact, but since all lubricants were 'watery', viscosity was not likely to affect the wear rates. The wear mechanisms produced have however been validated in earlier papers [17][18][19]22]. The burnished appearance that dominated in all tests with a protein-containing lubricant (Figs.…”

Section: Discussionmentioning

confidence: 81%

“…In earlier RandomPOD studies with alpha calf serum diluted 1:1 with DW at 20 °C and polished CoCr counterfaces the mean k of gamma-sterilized (25 kGy) UHMWPE ('Sulene-PE') was 3.92 × 10 -6 mm 3 /Nm [18]. The wear of electron beam irradiated (95 kGy), heattreated, highly crosslinked UHMWPE ('Durasul') was so low that it could not be quantified with a balance of 0.01 mg resolution [22]. The former value is 3.3-fold larger compared with the mean k obtained for VEXLPE in the present study, 1.19 × 10 -6 mm 3 /Nm (p < 0.001).…”

Section: Discussionmentioning

confidence: 99%

Effect of serum dilution fluids on the wear of unirradiated and high dose gamma-irradiated, vitamin E stabilized UHMWPE

Saikko

2019

Wear

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In orthopaedic tribology, the ISO 14242-1 standard recommends that the serum lubricant is diluted with deionized water (DW). Sometimes, phosphate buffered saline (PBS) is used instead for the dilution. Noncyclic, multidirectional pin-on-disk tests showed that the dilution of alpha calf serum with PBS or phosphate buffer resulted in a 5 to 40-fold decrease in the wear factor of unirradiated and of vitamin E stabilized, highly crosslinked ultrahigh molecular weight polyethylene (UHMWPE) compared with DW dilution. It appears that the phosphates were mainly responsible for this phenomenon. PBS dilution may result in a substantial underestimation of clinical wear. With 1:1 DW dilution, the mean wear factor of highly crosslinked UHMWPE was 5.7-fold lower than that of unirradiated UHMWPE.

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“…The 2016 Australian Orthopaedic Association National Joint Replacement Registry (AOANJRR) [1] and the National Joint Registry (NJR) Annual Report for England, Wales, Northern Ireland and the Isle of Man [3] both cite aseptic loosening as the main reason for TKR revision at 10 years and beyond. Whilst there are many factors that influence PE wear within TKR, an increased surface roughness of the counter-face femoral component has been reported as one of the causative mechanisms of accelerated PE wear [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

A comparative surface topographical analysis of explanted total knee replacement prostheses: Oxidised zirconium vs cobalt chromium femoral components

Kennard

Scholes

Sidaginamale

et al. 2017

Medical Engineering & Physics

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It has been proposed that an increased surface roughness of the femoral components of Total Knee Replacements (TKRs) may be a contributing factor to the accelerated wear of the polyethylene (PE) bearing and ultimately prosthesis failure. Oxidised Zirconium was introduced to the orthopaedic market in an attempt to reduce PE wear associated failures and increase the longevity of the prosthesis. In this study, non-contacting profilometry was used to measure the surface roughness of the femoral components of 6 retrieved TKRs (3 Oxidised Zirconium (OxZr) and 3 Cobalt Chromium alloy (CoCr) femoral components) and 2 as-manufactured femoral components (1 OxZr and 1 CoCr). A semi-quantitative method was used to analyse the damage on the retrieved PE components. The S values for the retrieved OxZr femoral components (S = 0.093 µm ± 0.014) and for the retrieved CoCr femoral components (S = 0.065 µm ± 0.005) were significantly greater (p < .05) than the roughness values for the as-manufactured femoral components (OxZr S = 0.061 µm ± 0.004 and CoCr S = 0.042 µm ± 0.003). No significant difference was seen between the surface roughness parameters of the retrieved OxZr and retrieved CoCr femoral components. There was no difference between the PE component damage scores for the retrieved OxZr TKRs compared to the retrieved CoCr TKRs. These results agree with other studies that both OxZr and CoCr femoral components roughen during time in vivo but the lack of difference between the surface roughness measurements of the two materials is in contrast to previous topographical reports. Further analysis of retrieved OxZr TKRs is recommended so that a fuller appreciation of their benefits and limitations be obtained.

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Effect of CoCr Counterface Roughness on the Wear of UHMWPE in the Noncyclic RandomPOD Simulation

Abstract: Abstract

Cited by 8 publications

References 23 publications

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

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

Effect of serum dilution fluids on the wear of unirradiated and high dose gamma-irradiated, vitamin E stabilized UHMWPE

A comparative surface topographical analysis of explanted total knee replacement prostheses: Oxidised zirconium vs cobalt chromium femoral components

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