Compressive loading causes unique mechanism of failure in second generation sliding hip screw

Monique Bethel, Jeffrey Levenda, Peter Hogg, Daniel Alge, Tien Min G. Chu, Brian Mullis

Research output: Contribution to journalArticle

Abstract

The sliding hip screw (SHS) has been used for the fixation of intertrochanteric hip fractures for decades. Newer devices have been designed to address persistent failures in SHS; however, the superiority of all new devices has not been established. We compared the stability of a classic SHS to a 2nd generation device. Intertrochanteric fractures were created in cadaveric and synthetic femurs, and then repaired with either a 1st generation SHS or a 2nd generation SHS. Fixation by both implants was tested by compressive loading. There was a significantly higher rate of failure via rotational instability of the proximal fragment (p < 0.05) with the 2nd generation SHS due to disengagement of an anti-rotational bushing mechanism. Further studies are needed to determine if this study translates to concerns for higher failure rates in the clinical setting, however our results suggest that there is no benefit to the use of this 2nd generation device.

Original languageEnglish (US)
Pages (from-to)311-320
Number of pages10
JournalInternational Journal of Medical Engineering and Informatics
Volume5
Issue number4
DOIs
StatePublished - Oct 31 2013

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Keywords

  • Biomechanics
  • DHS
  • Dynamic helical hip screw
  • Dynamic hip screw
  • Helical blade
  • Intertrochanteric hip fracture
  • Locking sliding hip screw
  • Spiral blade

ASJC Scopus subject areas

  • Biomedical Engineering
  • Health Informatics
  • Medicine (miscellaneous)
  • Biomaterials

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