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research-article

The Effect of Surgical Alignment in Adult Scoliotic Spines on Axial Cyclic Vibration: A Finite Element Study

[+] Author and Article Information
Ming Xu

Human-Centric Design Research Lab, Department of Mechanical Engineering, Texas Tech University, Lubbock, TX 79401, USA
ming.xu@ttu.edu

James Yang

ASME Fellow, Human-Centric Design Research Lab, Department of Mechanical Engineering, Texas Tech University, Lubbock, TX 79401, USA
james.yang@ttu.edu

Isador Lieberman

Texas Back Institute, Plano, TX, USA
ilieberman@texasback.com

Ram Haddas

Texas Back Institute, Plano, TX, USA
rhaddas@texasback.com

1Corresponding author.

ASME doi:10.1115/1.4042326 History: Received September 19, 2018; Revised December 12, 2018

Abstract

Finite element analysis was used to investigate the responses of five adult degenerative scoliosis subjects to cyclic vibration before and after surgical alignment (SA). The dynamic responses of the healthy and pre-surgical scoliotic spines to the sinusoidal cyclic vibrations have been investigated in previous studies by computational and experimental approaches. However, no computational or experimental results were available for the pre- and post-surgical scoliosis subjects. The effect of the SA on the vibrational response of the post-surgical scoliosis subjects remained unknown. The objective of this study was to compare differences of the dynamic responses to the cyclic vibration input among the scoliotic spines for pre and post SA. Previous studies suggested that untreated scoliotic spines especially at the apical vertebrae are more sensitive to the vibration than spinal segments with normal anatomies. Results of this study showed that the SA was able to reduce the vibrational response of the scoliotic spines to the whole body vibrations at the fused level while not significantly increase the response at the superior adjacent level, which suggested that SA is able to reduce the risk of further degeneration in the scoliotic spines.

Copyright (c) 2018 by ASME
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