Severe damage of alumina-on-alumina hip implants: Wear assessments at a microscopic level

Saverio Affatato, Paola Taddei, Simone Carmignato, Enrico Modena, Aldo Toni

Research output: Contribution to journalArticlepeer-review

Abstract

Six retrieved alumina hip implants were investigated for severe damage after a mean follow-up of 13 years (range: 8-21 years) using a multivariable approach: a coordinate measuring machine was used to quantify volumetric wear, the surface was characterized by scanning electron microscopy, and fluorescence and Raman spectroscopy were used to investigate the phenomenon on a micrometer crystal scale. All the femoral heads exhibited significant loss of roundness with heavy deviation from the original sphericity, showing an average volumetric wear of 602±3mm 3. A smooth surface with occasional pits and agglomerates was observed; formation of craters and loss of surface integrity was revealed. The femoral heads characterized by the highest volumetric wear underwent the most significant stress on a micrometer crystal scale (i.e. the most pronounced changes in the width of the fluorescence and Raman bands).

Original languageEnglish
Pages (from-to)3647-3657
Number of pages11
JournalJournal of the European Ceramic Society
Volume32
Issue number14
DOIs
Publication statusPublished - Nov 2012

Keywords

  • Alumina damage
  • Fluorescence
  • Raman spectroscopy
  • SEM
  • Severe wear

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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