In vitro wear assessments of fixed and mobile UHMWPE total knee replacement

Saverio Affatato, Pierangiola Bracco, Alessandra Sudanese

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

This work discusses the wear behaviour of two different ultra-high-molecular-weight-polyethylene tibial component designs. Mobile and fixed bearings were tested on a knee wear simulator for 5 million cycles using bovine calf serum as lubricant. We correlated the wear results with the chemical characterisation of the investigated materials: Fourier Transformed Infra Red Spectroscopy analyses, Differential Scanning Calorimetry and cross-link density measurements were used to assess the chemical features of this polyethylene. Mobile and fixed polyethylene inserts showed a different wear behaviour: the mobile designs components showed lower weight losses than the fixed components (109 ± 6 mg and 163 ± 80 mg, respectively). Significant statistical differences were observed in wear rate (P = 0.035, Kolmogorov-Smirnov Test for two samples). From a molecular point of view, typical radiation-induced oxidation profiles were observed in all the tested polyethylene samples, but the overall degradation was more significant in the fixed bearing inserts and this is likely to play a role on the wear performances.

Original languageEnglish
Pages (from-to)44-51
Number of pages8
JournalMaterials and Design
Volume48
DOIs
Publication statusPublished - 2013

Fingerprint

Knee prostheses
Ultrahigh molecular weight polyethylenes
Wear of materials
Polyethylene
Bearings (structural)
Polyethylenes
Lubricants
ultra-high molecular weight polyethylene
Differential scanning calorimetry
Infrared spectroscopy
Simulators
Radiation
Degradation
Oxidation

Keywords

  • Crystallinity
  • Fixed TKR
  • FTIR analyses
  • Mobile TKR
  • Wear

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

Cite this

In vitro wear assessments of fixed and mobile UHMWPE total knee replacement. / Affatato, Saverio; Bracco, Pierangiola; Sudanese, Alessandra.

In: Materials and Design, Vol. 48, 2013, p. 44-51.

Research output: Contribution to journalArticle

Affatato, Saverio ; Bracco, Pierangiola ; Sudanese, Alessandra. / In vitro wear assessments of fixed and mobile UHMWPE total knee replacement. In: Materials and Design. 2013 ; Vol. 48. pp. 44-51.
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