Upper lumbar pedicle screw insertion using three-dimensional fluoroscopy navigation: Assessment of clinical accuracy

Yoshihisa Sugimoto, Yasuo Ito, Masao Tomioka, Tetsuya Shimokawa, Yasuyuki Shiozaki, Tetsuro Mazaki, Masato Tanaka

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We used a navigation system to insert 128 pedicle screws into 69 vertebrae (LI to L3) of 49 consecutive patients. We assessed the pedicle isthmic width and the permission angle for pedicle screw insertion. The permission angle is the angle defined by the greatest medial and lateral trajectories allowable when placing the screw through the center of the pedicle. The rate of narrow-width pedicles (isthmic width less than 5mm) was 5 of 60 pedicles (8%) at LI, 4 of 60 pedicles (7%) at L2, and none (0%) at L3, L4 and L5. The rate of narrow-angle pedicles (a permission angle less than 15 degrees) was 21 of 60 pedicles (35%) at LI, 7 of 60 (12%) at L2, 3 of 60 (5%) at L3, and none (0%) at L4 and L5. Of 128 pedicle screws inserted into 69 vertebrae from LI to L3, 125 (97.7%) were classified as Grade 1 (no pedicle perforation). In general, the upper lumbar vertebrae have more narrow-width and -angle pedicles. However, we could reduce the rate of pedicle screw misplacement in upper lumbar vertebra using a three-dimensional fluoroscopy and navigation system.

Original languageEnglish
Pages (from-to)293-297
Number of pages5
JournalActa medica Okayama
Volume64
Issue number5
Publication statusPublished - 2010

Keywords

  • Anatomy
  • Misplacement
  • Navigation
  • Pedicle screw
  • Upper lumbar

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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    Sugimoto, Y., Ito, Y., Tomioka, M., Shimokawa, T., Shiozaki, Y., Mazaki, T., & Tanaka, M. (2010). Upper lumbar pedicle screw insertion using three-dimensional fluoroscopy navigation: Assessment of clinical accuracy. Acta medica Okayama, 64(5), 293-297.