alexa
Reach Us +44-7447-215064
Pullout Strength Of Anterior Lumbar Interbody Fusion Plates: Fixed Versus Variable Angle Screw Designs | OMICS International | Abstract
ISSN: 2165-7939

Journal of Spine
Open Access

Our Group organises 3000+ Global Conferenceseries Events every year across USA, Europe & Asia with support from 1000 more scientific Societies and Publishes 700+ Open Access Journals which contains over 50000 eminent personalities, reputed scientists as editorial board members.

Open Access Journals gaining more Readers and Citations
700 Journals and 15,000,000 Readers Each Journal is getting 25,000+ Readers

This Readership is 10 times more when compared to other Subscription Journals (Source: Google Analytics)

Research Article

Pullout Strength Of Anterior Lumbar Interbody Fusion Plates: Fixed Versus Variable Angle Screw Designs

Zachary S. Hadley, Daniel K. Palmer, Paul A. Williams and Wayne K. Cheng*
Department of Orthopaedic Surgery, Loma Linda University, Loma Linda, California, USA
Corresponding Author : Wayne K. Cheng
Department of Orthopaedic Surgery
School of Medicine, Loma Linda University
11406 Loma Linda, California 92354, USA
Tel: (909) 558-6444
Fax: (909) 558-6118
E-mail: [email protected]
Received March 08, 2012; Accepted May 21, 2012; Published May 23, 2012
Citation: Hadley ZS, Palmer DK, Williams PA, Cheng WK (2012) Pullout Strength of Anterior Lumbar Interbody Fusion Plates: Fixed Versus Variable Angle Screw Designs. J Spine 1:118. doi:10.4172/2165-7939.1000118
Copyright: © 2012 Hadley ZS, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Abstract
Purpose: To compare the pullout loads of variable versus fixed angle screws in anterior lumbar interbody fusion (ALIF) plate/screw constructs in both foam and cadaveric models.
Methods: An ALIF plate was secured to a 0.160 g/cm3 polyurethane foam block (N = 10) with fixed or equivalently positioned variable angle screws and pulled out at 1 mm/min to failure. Embalmed human vertebral pairs (N = 10) were similarly utilized to compare fixed versus variable angle plate/screw constructs for pullout strength.
Results: There was no statistically significant difference between fixed and variable angle plates for either foam (p = 0.6) or vertebral specimens (p = 0.3) based on maximum load or stiffness. The maximum load for the vertebral specimens was on average 39% of that for the foam (p = 0.001) and the stiffness was about 55% of that for the foam (p = 0.001).
Conclusions: In this study, no statistically significant difference in pullout strength or stiffness was found between fixed and variable angle ALIF plate/screw constructs. However, the embalmed cadaveric bone model was shown to be statistically weaker in pullout strength and stiffness when compared to the foam model. This study suggests that the foam model may not always be representative of the cadaveric model in the magnitude of load, but may still provide good comparative results between different designs.

Keywords

Recommended Conferences
Share This Page
Top