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Journal of Orthopaedic Surgery and Research

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Open Access 01-12-2015 | Research article

A biomechanical comparison between cortical bone trajectory fixation and pedicle screw fixation

Authors: Hiroki Oshino, Toshihiko Sakakibara, Tadashi Inaba, Takamasa Yoshikawa, Takaya Kato, Yuichi Kasai

Published in: Journal of Orthopaedic Surgery and Research | Issue 1/2015

Abstract

Purpose

There have been several reports on the pullout strength of cortical bone trajectory (CBT) screws, but only one study has reviewed the stability of functional spine units using the CBT method. The purpose of this study was to compare vertebral stability after CBT fixation with that after pedicle screw (PS) fixation.

Methods

In this study, 20 lumbar spine (L5–6) specimens were assigned to two groups: the CBT model group that underwent CBT screw fixation (n = 10) and the PS model group that underwent pedicle screw fixation (n = 10). Using a six-axis material testing machine, bend and rotation tests were conducted on each model. The angular displacement from the time of no load to the time of maximum torque was defined as range of motion (ROM), and then, the mean ROM in the bend and rotation tests and the mean rate of relative change of ROM in both the bend and rotation tests were compared between the CBT and PS groups.

Results

There were no significant differences between the CBT and PS groups with regard to the mean ROMs and the mean rate of relative change of ROMs in both the bend and rotation tests.

Conclusion

Intervertebral stability after CBT fixation was similar to that after PS fixation.

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Title: A biomechanical comparison between cortical bone trajectory fixation and pedicle screw fixation
Authors: Hiroki Oshino
Toshihiko Sakakibara
Tadashi Inaba
Takamasa Yoshikawa
Takaya Kato
Yuichi Kasai
Publication date: 01-12-2015
Publisher: BioMed Central
Published in: Journal of Orthopaedic Surgery and Research / Issue 1/2015
Electronic ISSN: 1749-799X
DOI: https://doi.org/10.1186/s13018-015-0270-0

At a glance: The STEP trials

Springer Medicine

A biomechanical comparison between cortical bone trajectory fixation and pedicle screw fixation

Abstract

Purpose

Methods

Results

Conclusion

At a glance: The STEP trials

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusion

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