The Concept of Lamina-Pedicle Perpendicularity: Part 2: Thoracic Spine.

Asian Spine Journal
Tarek Anwar ElfikyDino Samartzis

Abstract

Retrospective radiographic study. The hypothesis of this study was that the pedicle axis (PA) is almost perpendicular to the interlaminar line (ILL) in the sagittal plane of the thoracic vertebrae. The objective of the current study was to define the thoracic lamina-PA inclination in order to verify the right-angle concept and to estimate the safety zones for sagittal inclination during pedicle screw insertion. The authors, to the best of their knowledge, are unaware of previous similar studies. Based on the study's observations of different spinal disorders, including deformities, it was noted that following a sagittal cranial-caudal trajectory perpendicular to the ILL and joining the two adjacent thoracic vertebrae would work well at most vertebral levels. This was a retrospective study on the computed tomography (CT) chest scans of patients with no spinal pathologies. The ILL-PA, superior and inferior safe angles of the pedicle screw trajectories, and the exit zone of the screw perpendicular to the ILL were reviewed by two observers via three-dimensional multiplanar reconstruction mode of the Horos DICOM software (https://horosproject.org/). The CT chest images of 30 consecutive patients (20 males and 10 females) with a mean...Continue Reading

References

Jul 25, 2000·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·H HalmU Liljenqvist
Jan 31, 2004·Spine·Stefan ParentJacques de Guise
Jan 31, 2004·Spine·Yongjung J KimK Daniel Riew
Aug 3, 2010·The Journal of Bone and Joint Surgery. British Volume·W ChoC Wu
Jan 30, 2014·Journal of Biomedical Research·Juming LiXiaojian Cao
Oct 8, 2014·Journal of Neurosciences in Rural Practice·Mark A RivkinSteven S Yocom
Jun 5, 2018·Clinical Spine Surgery : a Spine Publication·Masahito OshinaYasushi Oshima
Feb 14, 2020·Asian Spine Journal·Tarek Anwar ElfikyDino Samartzis

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