On the mechanical stability of porous coated press fit titanium implants: A finite element study of a pushout test

Benedikt Helgason, Marco Viceconti, Tómas P. Rúnarsson, Sigurdur Brynjólfsson

Research output: Contribution to journalArticle

Abstract

Pushout tests can be used to estimate the shear strength of the bone implant interface. Numerous such experimental studies have been published in the literature. Despite this researchers are still some way off with respect to the development of accurate numerical models to simulate implant stability. In the present work a specific experimental pushout study from the literature was simulated using two different bones implant interface models. The implant was a porous coated Ti-6Al-4V retrieved 4 weeks postoperatively from a dog model. The purpose was to find out which of the interface models could replicate the experimental results using physically meaningful input parameters. The results showed that a model based on partial bone ingrowth (ingrowth stability) is superior to an interface model based on friction and prestressing due to press fit (initial stability). Even though the present study is limited to a single experimental setup, the authors suggest that the presented methodology can be used to investigate implant stability from other experimental pushout models. This would eventually enhance the much needed understanding of the mechanical response of the bone implant interface and help to quantify how implant stability evolves with time.

Original languageEnglish
Pages (from-to)1675-1681
Number of pages7
JournalJournal of Biomechanics
Volume41
Issue number8
DOIs
Publication statusPublished - 2008

Keywords

  • Finite element analysis
  • Implant stability
  • Pushout test

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

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