A finite element study of the initiation of failure of fixation in cemented femoral total hip components

T. P. Harrigan, J. A. Kareh, D. O. O'Connor, D. W. Burke, W. H. Harris

Research output: Contribution to journalArticlepeer-review

Abstract

In order to study initial mechanisms of failure in cemented femoral total hip components, an anatomically accurate three‐dimensional linear finite element model was constructed and verified against experimental strain measurements in the cement mantle. Good agreement was found between predicted and measured strains. The likelihood of failure initiation due to cement‐prosthesis debonding and crack initiation at voids was studied for loading conditions simulating both one‐legged stance and stair climbing. The “out of plane” forces involved in stair climbing appear to be the greatest threat to the fixation of total hip replacements. In stair climbing, cement‐prosthesis debonding and pore crack initiation were probable in the proximal anteromedial region of the cement mantle, and near the distal tip of the implant. The proximal stresses in stair climbing were higher than the distal stresses in either stair climbing or one‐legged stance.

Original languageEnglish (US)
Pages (from-to)134-144
Number of pages11
JournalJournal of Orthopaedic Research
Volume10
Issue number1
DOIs
StatePublished - Jan 1992
Externally publishedYes

Keywords

  • Cement
  • Debonding
  • Failure
  • Interface
  • Stair climbing
  • Total hip

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

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