Investigation of external forces’ effect on correction of scoliosis, finite element analyzing and modeling of vertebrae’ patient using CT-scan images.

Document Type: Original Article

Authors

Azad University

10.22034/jbr.2020.218571.1019

Abstract

The one of most troubling and challenging issues concerning with vertebrae is scoliosis. This abnormality is formed due to deformation of vertebrae around anatomical planes. Of measuring parameters of scoliosis’ intensity is cobb’s angle. Modifications and optimizations of affective factors are useful in treatment process. In this article, at first the dimensional data of patient’s vertebrae are captured using Mimics software and CT-scan images. After modeling in Catia software, they were imported in Abaqus software in order to analyze the models. For studying the effect of two different assumptions for intervertebral disc, they were simulated in one and two pieces’ form. In the first step, models were loaded with just the force of vertebrae’ weight (W). Next, the implant rods’ forces which obtained from another study plus weight (W+S) are used and in order to compare with another external forces which calculated and optimized by trial and error tests (W+C) during this study plus weight are imposed on models. With regard to the results acquired in this study, it can be seen clearly that by utilization of first force’s group (W+S), the percentage of cobb’s angle correction for one-piece and two-pieces disc is 34.10% and 40.52% respectively, and by using just weight force, correction (0.05%) isn’t effective enough. In addition, it’s obviously determined that effective forces of cobb’s angle correction and the parameters like stress and displacements in the analysis of two-pieces disc model illustrates better results than one-piece model.

Graphical Abstract

Investigation of external forces’ effect on correction of scoliosis, finite element analyzing and modeling of vertebrae’ patient using CT-scan images.

Keywords