Does knee implant size affect wear variability?

Saverio Affatato, Laura Grillini, Santina Battaglia, Paola Taddei, Enrico Modena, Alessandra Sudanese

Research output: Contribution to journalArticlepeer-review


Small and large sized-mobile inserts (i.e. size #2 and size #6) were tested on a knee wear simulator for 2 million cycles, using bovine calf serum as lubricant. Gravimetric and micro-Raman spectroscopic analyses were performed on polyethylene inserts. Roughness analysis was performed on the metallic components. The larger size, i.e. #6, had almost twice weight loss with respect to the smaller one, i.e. #2 (37.8±2.8 mg and 19.46±0.93 mg, respectively). Significant statistical differences were observed in wear rates (p=0.001, Kolmogorov-Smirnov test for two samples). Raman spectroscopy showed a greater increase in crystallinity for the smaller inserts: upon wear, the orthorhombic content (αo) significantly increased at the expense of the third phase content (αb).

Original languageEnglish
Pages (from-to)174-181
Number of pages8
JournalTribology International
Publication statusPublished - 2013


  • Knee simulator
  • Mobile TKR
  • Raman spectroscopy
  • Wear

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces


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