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European Spine Journal

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01-03-2012 | Original Article

Biomechanical analysis of a new expandable vertebral body replacement combined with a new polyaxial antero-lateral plate and/or pedicle screws and rods

Authors: Benjamin Ulmar, Stefanie Erhart, Stefan Unger, Kuno Weise, Werner Schmoelz

Published in: European Spine Journal | Issue 3/2012

Abstract

Purpose

Restoration of the anterior spinal profile and regular load-bearing is the main goal treating anterior spinal defects in case of fracture. Over the past years, development and clinical usage of cages for vertebral body replacement have increased rapidly. For an enhanced stabilization of rotationally unstable fractures, additional antero-lateral implants are common. The purpose of this study was the evaluation of the biomechanical behaviour of a recently modified, in situ distractible vertebral body replacement (VBR) combined with a newly developed antero-lateral polyaxial plate and/or pedicle screws and rods using a full corpectomy model as fracture simulation.

Methods

Twelve human spinal specimens (Th12–L4) were tested in a six-degree-of-freedom spine tester applying pure moments of 7.5 Nm to evaluate the stiffness of three different test instrumentations using a total corpectomy L2 model: (1) VBR + antero-lateral plate; (2) VBR, antero-lateral plate + pedicle screws and rods and (3) VBR + pedicle screws and rods.

Results

In the presented total corpectomy defect model, only the combined antero-posterior instrumentation (VBR, antero-lateral plate + pedicle screws and rods) could achieve higher stiffness in all three-movement planes than the intact specimen. In axial rotation, neither isolated anterior instrumentation (VBR + antero-lateral plate) nor isolated posterior instrumentation (VBR + pedicle screws and rods) could stabilize the total corpectomy compared to the intact state.

Conclusions

For rotationally unstable vertebral body fractures, only combined antero-posterior instrumentation could significantly decrease the range of motion (ROM) in all motion planes compared to the intact state.

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Title: Biomechanical analysis of a new expandable vertebral body replacement combined with a new polyaxial antero-lateral plate and/or pedicle screws and rods
Authors: Benjamin Ulmar
Stefanie Erhart
Stefan Unger
Kuno Weise
Werner Schmoelz
Publication date: 01-03-2012
Publisher: Springer-Verlag
Published in: European Spine Journal / Issue 3/2012
Print ISSN: 0940-6719
Electronic ISSN: 1432-0932
DOI: https://doi.org/10.1007/s00586-011-2042-9

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Biomechanical analysis of a new expandable vertebral body replacement combined with a new polyaxial antero-lateral plate and/or pedicle screws and rods

Abstract

Purpose

Methods

Results

Conclusions

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusions

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