Correlation of bone equivalent mineral density to pull-out resistance of triangulated pedicle screw construct

Alexander G. Hadjipavlou, Clarence L. Nicodemus, Farouq A. Al-Hamdan, James W. Simmons, Malcolm H. Pope

Research output: Contribution to journalArticlepeer-review

50 Scopus citations

Abstract

Thirty single-pedicle and triangulated pedicle screws were subjected to pullout tests until complete dislodgment was achieved. Peak load, displacement curves, angle of triangulation, and equivalent mineral density were recorded. Dual pedicle screw triangulation produced a 154.4% increase in peak pull-out strength compared with that of file single pedicle screw. Salvage triangulation (replacing failed screws with a triangulation construct) produced a 127.4% increase in peak strength over that of the single screw. Positive correlation was found between individual screw peak strength, bone mineral density, and displacement at peak load. Primary and salvage triangulation produced higher resistance to pull-out than a single pedicle screw, which reflects the potential, beneficial effect of using this technique. Triangulation, therefore, can be used as a primary (prophylactic) technique to enhance pedicular screw pull-out during forceful vertebral manipulation.

Original languageEnglish (US)
Pages (from-to)12-19
Number of pages8
JournalJournal of Spinal Disorders
Volume10
Issue number1
StatePublished - Feb 24 1997

Keywords

  • Load displacement curve
  • Osteopenia
  • Pedicle screw triangulation
  • Salvage procedure
  • Spine

ASJC Scopus subject areas

  • Surgery
  • Clinical Neurology

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