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Research Papers

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
e-mail: ming.xu@ttu.edu

James Yang

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

Isador Lieberman

Texas Back Institute,
Plano, TX 75093
e-mail: ilieberman@texasback.com

Ram Haddas

Texas Back Institute,
Plano, TX 75093
e-mail: rhaddas@texasback.com

1Corresponding author.

Contributed by the Computers and Information Division of ASME for publication in the JOURNAL OF COMPUTING AND INFORMATION SCIENCE IN ENGINEERING. Manuscript received September 19, 2018; final manuscript received December 12, 2018; published online February 4, 2019. Assoc. Editor: Ashok V. Kumar.

J. Comput. Inf. Sci. Eng 19(2), 021006 (Feb 04, 2019) (6 pages) Paper No: JCISE-18-1257; doi: 10.1115/1.4042326 History: Received September 19, 2018; Revised December 12, 2018

Finite element analysis was used to investigate the responses of five adult degenerative scoliosis (ADS) subjects to cyclic vibration before and after surgical alignment (SA). The dynamic responses of the healthy and presurgical 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 postsurgical scoliosis subjects. The effect of the SA on the vibrational response of the postsurgical 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 (WBV) 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.

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Figures

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Fig. 1

Ten scoliosis FE models tested in this study: (a) model 1, (b) model 2, (c) model 3, (d) model 4, (e) model 5, (f) model 6, (g) model 7, (h) model 8, (i) model 9, and (j) model 10

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Fig. 2

Three translational response directions [8]: (a) vertical direction (long axis), (b) lateral direction (coronal axis), and (c) anteroposterior direction (sagittal axis)

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Fig. 3

Translational vibration-induced response in the 81-year-old male subject: (a) presurgical T12, L3 and postsurgical T12 in vertical direction and (b) postsurgical L3 in three directions

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Fig. 4

Predicted resonant amplitudes of vertebrae in pre- and postsurgical alignment of scoliotic spines

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Fig. 5

The number of resonant frequencies in the pre- and postsurgical scoliotic spines

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Fig. 6

Comparison of first resonant frequencies for the same vertebra in presurgical and postsurgical subjects

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Fig. 7

Change in the maximum resonant amplitude of L4 in the presurgical 64-year-old male subject by increasing and reducing the Young's modulus of different spinal tissues by 25%, respectively

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