Prediction of fatigue screw loosening in anterior spinal fixation using dual energy x-ray absorptiometry

Spine
T H LimC R Wilson

Abstract

A biomechanical study was performed to investigate a relation between the bone mineral density of the vertebral body and the number of loading cycles to induce fatigue loosening of an anterior vertebral screw. The objective of this study was to investigate the potential usefulness of dual energy x-ray absorptiometry of measuring bone mineral density of the vertebral body in predicting the fatigue loosening of th anterior vertebral screw. Loosening of the vertebral body screw is a well know failure in spinal instrumentation, and more commonly observed than pullout failure. The relation between bone mineral density and pullout strength of the screw has been investigated previously, but no studies are available on the fatigue loosening in anterior spinal fixation. Bone mineral density was measured using dual energy x-ray absorptiometry and the screw loosening was produce by a cyclic loading in the cephalad-caudal direction. Screw loosening was defined as 1 mm displacement of the screw relative to bone, and the number of loading cycles to induce the screw loosening was obtained and statistically correlated with bone mineral density. There was a positive correlation between the number of loading cycles to induce screw loosening and ...Continue Reading

Citations

Jul 26, 2006·Archives of Orthopaedic and Trauma Surgery·J GoldhahnE Schneider
Aug 15, 2000·Journal of Spinal Disorders·P J PapagelopoulosK N An
Jun 9, 2007·Neurosurgery Clinics of North America·Vedat Deviren, Lionel N Metz
Oct 3, 1998·The Orthopedic Clinics of North America·C A Brown, F J Eismont
Jun 5, 2003·Clinical Orthopaedics and Related Research·Panayiotis J PapagelopoulosKai-Nan An
Mar 9, 2011·Clinical Orthopaedics and Related Research·Norman A JohansonHaviva M Goldman
Jul 31, 1999·The Journal of Bone and Joint Surgery. American Volume·P H HsiehC C Niu
Apr 6, 2006·The Journal of Bone and Joint Surgery. American Volume·Vijay K GoelUNKNOWN American Society for Testing and Materials

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