The effect of screw insertion angle and thread type on the pullout strength of bone screws in normal and osteoporotic cancellous bone models

Puneet Patel, Duncan Shepherd, David Hukins

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

Screw fixation can be extremely difficult to achieve in osteoporotic (OP) bone because of its low strength. This study determined how pullout strength is affected by placing different bone screws at varying angles in normal and OP bone models. Pullout tests of screws placed axially, and at angles to the pullout axis (ranging from 10 degrees to 40 degrees), were performed in 0.09 g cm(-3), 0.16 g cm(-3) and 0.32 g cm(-3) polyurethane (PU) foam. Two different titanium alloy bone screws were used to test for any effect of thread type (i.e. cancellous or cortical) on the screw pullout strength. The cancellous screw required a significantly higher pullout force than the cortical screw (p
Original languageEnglish
Pages (from-to)822-828
Number of pages7
JournalMedical Engineering & Physics
Volume32
Issue number8
DOIs
Publication statusPublished - 1 Oct 2010

Keywords

  • Pullout strength
  • Osteoporosis
  • Screw insertion angle
  • Bone screws

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