In Vivo Femoral Head Damage and Its Effect on Polyethylene Wear

Hiroshi Ito, Caitlin M. Maloney, Roy D. Crowninshield, John C. Clohisy, Douglas J. McDonald, William J. Maloney

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

The purposes of this study were to determine the spectrum of femoral head damage in patients undergoing revision total hip arthroplasty and to determine the impact of that damage on polyethylene wear. One hundred eight consecutive modular metal femoral heads were retrieved at revision surgery. The mean roughness (Ra) value was 0.18 ± 0.18 μm. The roughest femoral heads (mean Ra, 0.56 μm) were from retrievals correlated with mode 2 wear (recurrent dislocation and complete wear through of the polyethylene liner). Five million cycles of wear tests were performed using retrieved femoral heads against both new conventional and highly cross-linked polyethylene. The mean wear rate of conventional polyethylene was 15.9 ± 4.3 mg and that of highly cross-linked polyethylene was 0.04 ± 0.14 mg per 1 million cycles (P < .001). Highly cross-linked polyethylene was more resistant to wear than conventional polyethylene, even when mated against roughened femoral heads.

Original languageEnglish
Pages (from-to)302-308
Number of pages7
JournalJournal of Arthroplasty
Volume25
Issue number2
DOIs
StatePublished - Feb 2010

Keywords

  • conventional polyethylene
  • highly cross-linked polyethylene
  • surface roughness
  • total hip arthroplasty
  • wear

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