Biomechanical analysis of transpedicular rod systems: A preliminary report

Rolando M. Puno*, Joan E. Bechtold, J. Abbott Byrd, Robert B. Winter, James W. Ogilvie, David S. Bradford

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Two transpedicular spinal instrumentation systems were developed for fixation of the lumbosacral junction: a transpedicular fixator and the transpedicular screw/rod system. Mechanical testing showed that the new systems have a rigidity that is intermediate between conventional wired implants (Galveston and Luque ring) and plate systems (Steffee plate). Neither pedicular implant approached the rigidity of the Steffee plate with S2 fixation, but in compression and anterior bending both were more rigid than the Steffee plate without S2 fixation. Despite the apparent mechanical advantages of the transpedicular fixator, it is currently too bulky for clinical use. The transpedicular screw/rod system is more appealing because the size leaves adequate area for bone grafting, and device placement is technically simple. Furthermore, it may be contoured to any plane, while retaining stability provided by the clamps and screws.

Original languageEnglish
Pages (from-to)973-980
Number of pages8
Issue number8
StatePublished - Aug 1991
Externally publishedYes


  • Lumbosacral joint
  • Pedicle fixation
  • Rigidity
  • Spinal instrumentation
  • Spine fusion


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