Triangulated pedicle screw construct technique and pull-out strength of conical and cylindrical screws

A. Ono, M. D. Brown, L. L. Latta, E. L. Milne, D. C. Holmes

Research output: Contribution to journalArticle

26 Scopus citations


To compare the mechanical effectiveness of a new conical screw design with a conventional cylindrical screw design, the screw insertion time, torque, and pull-out strength of single-pedicle screw and triangulated-pedicle screw constructs of each type of screw were compared in human cadaveric vertebral bodies. The time required to insert the conical screws was less than that required for cylindrical screws. Regression analysis revealed a positive correlation between insertion torque and pull-out strength of single and triangulated constructs of each type of screw. The conical screw had a greater increase than the cylindrical screw in the pull-out strength of triangulated pedicle screw constructs. Application of the new conical screw design was significantly faster, and the new screw had better mechanical fixation to the vertebral body than did the conventional cylindrical screw tested.

Original languageEnglish (US)
Pages (from-to)323-329
Number of pages7
JournalJournal of Spinal Disorders
Issue number4
StatePublished - Aug 29 2001
Externally publishedYes



  • Conical pedicle screw
  • Cylindrical pedicle screw
  • Pull-out strength Triangulated pedicle screw construct

ASJC Scopus subject areas

  • Clinical Neurology
  • Surgery

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