Wear of conventional and cross‐linked ultra‐high‐molecular‐weight polyethylene acetabular cups against polished and roughened CoCr femoral heads in a biaxial hip simulator

Saikko, Vesa; Calonius, Olof; Keränen, Jaakko

doi:10.1002/jbm.10471

Cited by 78 publications

(61 citation statements)

References 13 publications

(40 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A 50 mm diameter Metasul MoM joint was first run in water, then dry and finally in serum. The crosslinked polyethylene cup (Durasul) was described in an earlier study [17]. It was run against smooth and roughened (Ra 0.1 µm) CoCr (MoP) and alumina (AoP) heads of 28 mm diameter, lubricated and dry.…”

Section: Methodsmentioning

confidence: 99%

Adverse condition testing with hip simulators

Saikko

2015

Biotribology

Self Cite

View full text Add to dashboard Cite

Recent clinical failures and abnormal sounds observed in certain prosthetic hip designs have directed attention to adverse condition hip simulator testing. In the present study, hip simulator wear and friction tests were made with a macroscopic separation of the bearing surfaces in the swing phase, steep acetabular cup position, increased load, poor or lacking lubrication, roughened bearing surfaces including titanium third bodies, and with combinations of these. The only conditions that resulted in squeaking were dry sliding with alumina-on-alumina and metal-on-metal, and an extreme peak load of 4 kN with serum lubricated metal-on-metal. The wear rate of metal-on-metal increased by an order of magnitude when the cup position was steep, 64 degrees, compared with the optimal position of 48 degrees. The increase of the peak load from 2 kN to 3 kN with the cup position of 48 degrees increased the running-in wear of metal-on-metal, but the steady state wear rates were equally low, of the order of 1 mg per one million cycles. Crosslinked polyethylene was the superior cup material under adverse conditions, including dry sliding and roughened femoral head.

show abstract

Section: Methodsmentioning

confidence: 99%

Adverse condition testing with hip simulators

Saikko

2015

Biotribology

Self Cite

View full text Add to dashboard Cite

show abstract

“…These PEs were included because the effect of crosslinking on the size and morphology of the particles was examined in several prior studies with varying results [1,4,12,41,42]. Two types of crosslinked PE were included to demonstrate the ability of the protocol to detect subtle differences between the two materials.…”

Section: Methodsmentioning

confidence: 99%

The John Charnley Award: An Accurate and Sensitive Method to Separate, Display, and Characterize Wear Debris: Part 1: Polyethylene Particles

Billi

Benya

Kavanaugh

et al. 2012

Clinical Orthopaedics &Amp; Related Research

View full text Add to dashboard Cite

Background Numerous studies indicate highly crosslinked polyethylenes reduce the wear debris volume generated by hip arthroplasty acetabular liners. This, in turns, requires new methods to isolate and characterize them. Questions/purposes We describe a method for extracting polyethylene wear particles from bovine serum typically used in wear tests and for characterizing their size, distribution, and morphology.Methods Serum proteins were completely digested using an optimized enzymatic digestion method that prevented the loss of the smallest particles and minimized their clumping. Density-gradient ultracentrifugation was designed to remove contaminants and recover the particles without filtration, depositing them directly onto a silicon wafer. This provided uniform distribution of the particles and high contrast against the background, facilitating accurate, automated, morphometric image analysis. The accuracy and precision of the new protocol were assessed by recovering and characterizing particles from wear tests of three types of polyethylene acetabular cups (no crosslinking and 5 Mrads and 7.5 Mrads of gamma irradiation crosslinking). Results The new method demonstrated important differences in the particle size distributions and morphologic parameters among the three types of polyethylene that could not be detected using prior isolation methods. Conclusion The new protocol overcomes a number of limitations, such as loss of nanometer-sized particles and artifactual clumping, among others. Clinical Relevance The analysis of polyethylene wear particles produced in joint simulator wear tests of prosthetic joints is a key tool to identify the wear mechanisms that produce the particles and predict and evaluate their effects on periprosthetic tissues.

show abstract

“…In vitro studies have shown that these materials show great improvements in resistance to wear [13,16,20]. Nevertheless, hip simulator data is not always consistent with clinical findings [10,14].…”

Section: Introductionmentioning

confidence: 99%

A systematic review of radiological outcomes of highly cross-linked polyethylene versus conventional polyethylene in total hip arthroplasty

Tian

et al. 2009

International Orthopaedics (SICOT)

View full text Add to dashboard Cite

The purpose of this study was to summarise the best evidence to assess radiological outcomes of highly crosslinked polyethylene compared with conventional polyethylene in total hip arthroplasty. All randomised, controlled clinical trials comparing highly cross-linked polyethylene with conventional polyethylene were sought and then analysed by two independent reviewers using the Cochrane collaboration guidelines. Eight studies in seven articles were identified as eligible for inclusion. Due to the clinical and methodological heterogeneity, data from the studies included could not be pooled. No failures related to highly cross-linked polyethylene were reported. All highly cross-linked polyethylene groups had a significantly lower wear or penetration than conventional polyethylene groups. This preliminary result suggests that highly cross-linked polyethylene has significantly less wear than conventional polyethylene.Résumé Le but de cette étude est de résumer les données indiscutables dans les prothèses totales de hanche concernant l'évaluation du devenir radiologique du polyéthylène hautement réticulé comparé au polyéthylène conventionnel. Tous les essais contrôlés, randomisés comparant le polyéthylène hautement réticulé au polyéthylène conventionnel ont été analysés par deux reviewers indépendants à partir de la base de Cochrane. 8 études dont 7 articles ont été identifiés et inclus dans ce travail. Du fait de l'hétérogénéicité clinique et méthodologique de ces études, toutes les données n'ont pu être regroupées. Aucun échec du polyéthylène hautement réticulé n'a été rapporté. Dans ces études, tous les groupes concernant le polyéthylène hautement réticulé et ont une usure et une pénétration plus basses que le polyéthylène conventionnel ceci de façon significative. Ces données préliminaires permettent de penser que le polyéthylène hautement réticulé a de façon significative moins d'usure que le polyéthylène conventionnel.

show abstract

Wear of conventional and cross‐linked ultra‐high‐molecular‐weight polyethylene acetabular cups against polished and roughened CoCr femoral heads in a biaxial hip simulator

Cited by 78 publications

References 13 publications

Adverse condition testing with hip simulators

Adverse condition testing with hip simulators

The John Charnley Award: An Accurate and Sensitive Method to Separate, Display, and Characterize Wear Debris: Part 1: Polyethylene Particles

A systematic review of radiological outcomes of highly cross-linked polyethylene versus conventional polyethylene in total hip arthroplasty

Contact Info

Product

Resources

About