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

Oshino H, Sakakibara T, Inaba T, Yoshikawa T, Kato T, Kasai Y - J Orthop Surg Res (2015)

Bottom Line: 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 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.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.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical Engineering, Mie University, Tsu City, Mie, Japan.

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.

No MeSH data available.


Related in: MedlinePlus

Pedicle screw fixation model
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Fig3: Pedicle screw fixation model

Mentions: To insert screws into the two fixed models, the authors prepared a burr hole with a 2-mm drill. The burr hole for the pedicle screw was created parasagittally (0°) to the intervertebral disk and at about 15° to the pedicle of the vertebral arch from the outer side to the inner side on the horizontal plane (Fig. 2). The burr hole for the CBT screw was created cranially at about 15° to the intervertebral disk on the sagittal plane and at about 15° to the pedicle of the vertebral arch from the inner side to the outer side on the horizontal plane (Fig. 3). Subsequently, each PS or CBT screw was inserted along the burr holes.Fig. 2


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

Oshino H, Sakakibara T, Inaba T, Yoshikawa T, Kato T, Kasai Y - J Orthop Surg Res (2015)

Pedicle screw fixation model
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4537537&req=5

Fig3: Pedicle screw fixation model
Mentions: To insert screws into the two fixed models, the authors prepared a burr hole with a 2-mm drill. The burr hole for the pedicle screw was created parasagittally (0°) to the intervertebral disk and at about 15° to the pedicle of the vertebral arch from the outer side to the inner side on the horizontal plane (Fig. 2). The burr hole for the CBT screw was created cranially at about 15° to the intervertebral disk on the sagittal plane and at about 15° to the pedicle of the vertebral arch from the inner side to the outer side on the horizontal plane (Fig. 3). Subsequently, each PS or CBT screw was inserted along the burr holes.Fig. 2

Bottom Line: 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 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.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.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical Engineering, Mie University, Tsu City, Mie, Japan.

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.

No MeSH data available.


Related in: MedlinePlus