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ID 40504
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Author
Sugimoto, Yoshihisa
Ito, Yasuo
Tomioka, Masao
Shimokawa, Tetsuya
Shiozaki, Yasuyuki
Mazaki, Tetsuro
Abstract
We used a navigation system to insert 128 pedicle screws into 69 vertebrae (L1 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 L1, 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 L1, 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 L1 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.
Keywords
upper lumbar
navigation
pedicle screw
anatomy
misplacement
Amo Type
Original Article
Published Date
2010-10
Publication Title
Acta Medica Okayama
Volume
volume64
Issue
issue5
Publisher
Okayama University Medical School
Start Page
293
End Page
297
ISSN
0386-300X
NCID
AA00508441
Content Type
Journal Article
language
英語
Copyright Holders
CopyrightⒸ 2010 by Okayama University Medical School
File Version
publisher
Refereed
True
PubMed ID
Web of Sience KeyUT