Prediction of deformity correction by pedicle screw instrumentation in thoracolumbar scoliosis surgery (Computer simulation study)

Yoshimori Kiriyama, Nobutoshi Yamazaki, Takeo Nagura, Morio Matsumoto, Kazuhiro Chiba, Yoshiaki Toyama

Research output: Contribution to journalArticle


In segmental pedicle screw instrumentation, the relationship between the combinations of pedicle screw placements and the degree of deformity correction was investigated with a three-dimensional rigid body and spring model. The virtual thoracolumbar scoliosis (Cobb's angle of 47 deg.) was corrected using six different combinations of pedicle-screw placements. As a result, better correction in the axial rotation was obtained with the pedicle screws placed at or close to the apical vertebra than with the screws placed close to the end vertebrae, while the correction in the frontal plane was better with the screws close to the end vertebrae than with those close to the apical vertebra. Additionally, two screws placed in the convex side above and below the apical vertebra provided better correction than two screws placed in the concave side. Effective deformity corrections of scoliosis were obtained with the proper combinations of pedicle screw placements.

Original languageEnglish
Pages (from-to)577-585
Number of pages9
JournalJSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing
Issue number4
Publication statusPublished - 2006 Jun 15



  • Bio-motion
  • Biomechanics
  • Computer simulation
  • Deformity correction
  • Muscle and skeleton
  • Rigid body and spring model
  • Segmental pedicle screw instrumentation
  • Thoracolumbar scoliosis

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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