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Biomechanics of a Fixed–Center of Rotation Cervical Intervertebral Disc Prosthesis

BACKGROUND: Past in vitro experiments studying artificial discs have focused on range of motion. It is also important to understand how artificial discs affect other biomechanical parameters, especially alterations to kinematics. The purpose of this in vitro investigation was to quantify how disc re...

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Autores principales: Crawford, Neil R., Baek, Seungwon, Sawa, Anna G.U., Safavi-Abbasi, Sam, Sonntag, Volker K.H., Duggal, Neil
Formato: Online Artículo Texto
Lenguaje:English
Publicado: International Society for the Advancement of Spine Surgery 2012
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4300875/
https://www.ncbi.nlm.nih.gov/pubmed/25694869
http://dx.doi.org/10.1016/j.ijsp.2011.10.003
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author Crawford, Neil R.
Baek, Seungwon
Sawa, Anna G.U.
Safavi-Abbasi, Sam
Sonntag, Volker K.H.
Duggal, Neil
author_facet Crawford, Neil R.
Baek, Seungwon
Sawa, Anna G.U.
Safavi-Abbasi, Sam
Sonntag, Volker K.H.
Duggal, Neil
author_sort Crawford, Neil R.
collection PubMed
description BACKGROUND: Past in vitro experiments studying artificial discs have focused on range of motion. It is also important to understand how artificial discs affect other biomechanical parameters, especially alterations to kinematics. The purpose of this in vitro investigation was to quantify how disc replacement with a ball-and-socket disc arthroplasty device (ProDisc-C; Synthes, West Chester, Pennsylvania) alters biomechanics of the spine relative to the normal condition (positive control) and simulated fusion (negative control). METHODS: Specimens were tested in multiple planes by use of pure moments under load control and again in displacement control during flexion-extension with a constant 70-N compressive follower load. Optical markers measured 3-dimensional vertebral motion, and a strain gauge array measured C4-5 facet loads. RESULTS: Range of motion and lax zone after disc replacement were not significantly different from normal values except during lateral bending, whereas plating significantly reduced motion in all loading modes (P < .002). Plating but not disc replacement shifted the location of the axis of rotation anteriorly relative to the intact condition (P < 0.01). Coupled axial rotation per degree of lateral bending was 25% ± 48% greater than normal after artificial disc replacement (P = .05) but 37% ± 38% less than normal after plating (P = .002). Coupled lateral bending per degree of axial rotation was 37% ± 21% less than normal after disc replacement (P < .001) and 41% ± 36% less than normal after plating (P = .001). Facet loads did not change significantly relative to normal after anterior plating or arthroplasty, except that facet loads were decreased during flexion in both conditions (P < .03). CONCLUSIONS: In all parameters studied, deviations from normal biomechanics were less substantial after artificial disc placement than after anterior plating.
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spelling pubmed-43008752015-02-18 Biomechanics of a Fixed–Center of Rotation Cervical Intervertebral Disc Prosthesis Crawford, Neil R. Baek, Seungwon Sawa, Anna G.U. Safavi-Abbasi, Sam Sonntag, Volker K.H. Duggal, Neil Int J Spine Surg Full Length Article BACKGROUND: Past in vitro experiments studying artificial discs have focused on range of motion. It is also important to understand how artificial discs affect other biomechanical parameters, especially alterations to kinematics. The purpose of this in vitro investigation was to quantify how disc replacement with a ball-and-socket disc arthroplasty device (ProDisc-C; Synthes, West Chester, Pennsylvania) alters biomechanics of the spine relative to the normal condition (positive control) and simulated fusion (negative control). METHODS: Specimens were tested in multiple planes by use of pure moments under load control and again in displacement control during flexion-extension with a constant 70-N compressive follower load. Optical markers measured 3-dimensional vertebral motion, and a strain gauge array measured C4-5 facet loads. RESULTS: Range of motion and lax zone after disc replacement were not significantly different from normal values except during lateral bending, whereas plating significantly reduced motion in all loading modes (P < .002). Plating but not disc replacement shifted the location of the axis of rotation anteriorly relative to the intact condition (P < 0.01). Coupled axial rotation per degree of lateral bending was 25% ± 48% greater than normal after artificial disc replacement (P = .05) but 37% ± 38% less than normal after plating (P = .002). Coupled lateral bending per degree of axial rotation was 37% ± 21% less than normal after disc replacement (P < .001) and 41% ± 36% less than normal after plating (P = .001). Facet loads did not change significantly relative to normal after anterior plating or arthroplasty, except that facet loads were decreased during flexion in both conditions (P < .03). CONCLUSIONS: In all parameters studied, deviations from normal biomechanics were less substantial after artificial disc placement than after anterior plating. International Society for the Advancement of Spine Surgery 2012-12-01 /pmc/articles/PMC4300875/ /pubmed/25694869 http://dx.doi.org/10.1016/j.ijsp.2011.10.003 Text en © 2012 ISASS - International Society for the Advancement of Spine Surgery. Published by Elsevier Inc. All rights reserved. http://creativecommons.org/licenses/by-nc-nd/3.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution-Noncommercial 3.0 Unported License, permitting all non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Full Length Article
Crawford, Neil R.
Baek, Seungwon
Sawa, Anna G.U.
Safavi-Abbasi, Sam
Sonntag, Volker K.H.
Duggal, Neil
Biomechanics of a Fixed–Center of Rotation Cervical Intervertebral Disc Prosthesis
title Biomechanics of a Fixed–Center of Rotation Cervical Intervertebral Disc Prosthesis
title_full Biomechanics of a Fixed–Center of Rotation Cervical Intervertebral Disc Prosthesis
title_fullStr Biomechanics of a Fixed–Center of Rotation Cervical Intervertebral Disc Prosthesis
title_full_unstemmed Biomechanics of a Fixed–Center of Rotation Cervical Intervertebral Disc Prosthesis
title_short Biomechanics of a Fixed–Center of Rotation Cervical Intervertebral Disc Prosthesis
title_sort biomechanics of a fixed–center of rotation cervical intervertebral disc prosthesis
topic Full Length Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4300875/
https://www.ncbi.nlm.nih.gov/pubmed/25694869
http://dx.doi.org/10.1016/j.ijsp.2011.10.003
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