scholarly journals Parameters influencing the outcome after total disc replacement at the lumbosacral junction. Part 1: misalignment of the vertebrae adjacent to a total disc replacement affects the facet joint and facet capsule forces in a probabilistic finite element analysis

2013 ◽  
Vol 22 (10) ◽  
pp. 2271-2278 ◽  
Author(s):  
A. Rohlmann ◽  
S. Lauterborn ◽  
M. Dreischarf ◽  
H. Schmidt ◽  
M. Putzier ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Facet Joint ◽  
Total Disc Replacement ◽  
Disc Replacement ◽  
Lumbosacral Junction ◽  
Element Analysis

FINITE ELEMENT ANALYSIS OF CERVICAL SPINE WITH DIFFERENT CONSTRAINED TYPES OF TOTAL DISC REPLACEMENT

2014 ◽  
Vol 14 (03) ◽  
pp. 1450038 ◽  
Author(s):  
CHIEN-YU LIN ◽  
SHIH-YOUENG CHUANG ◽  
CHANG-JUNG CHIANG ◽  
YANG-HWEI TSUANG ◽  
WENG-PIN CHEN
Keyword(s):  
Finite Element ◽  
Cervical Spine ◽  
Vertebral Body ◽  
Facet Joint ◽  
Total Disc Replacement ◽  
Axial Rotation ◽  
Disc Replacement ◽  
Normal Person ◽  
Fe Model ◽  
Segmental Motion

Various designs of cervical total disc replacement (CTDR) have been introduced and employed in an attempt to avoid disadvantages of the fusion surgery. The purposes of this study were to evaluate the effects of the range of motion (ROM), the instantaneous center of rotation (ICR) and the facet joint force (FJF) with different constrained types of CTDR devices. A three-dimensional finite element (FE) model of intact cervical spine (C3-7) was made from CT scans of a normal person and validated. Postoperative FE models simulating CTDR implantation at the C5-6 disc space were made for CTDR-I (constrained design) and CTDR-II (nonconstrained design), respectively. Hybrid protocol (intact: 1 Nm) with a compressive follower load of 73.6 N was applied at the superior endplate of the C3 vertebral body. The inferior endplate of C7 vertebral body was constrained in all directions. At the index level, CTDR-I showed a higher increase in segmental motion and FJF than CTDR-II in extension, lateral bending and axial rotation. The CTDR-II with an elastomer-type core reproduced a near physiological ICR of the intact model in extension and axial rotation. Abnormal kinetic and kinematic changes related to the CTDR may induce surgical level problems and cause long-term failure of spinal surgery.

A Validated Finite Element Analysis of Facet Joint Stress in Degenerative Lumbar Scoliosis

2016 ◽  
Vol 95 ◽  
pp. 126-133 ◽  
Author(s):  
Liang Wang ◽  
Bangke Zhang ◽  
Shuo Chen ◽  
Xuhua Lu ◽  
Zhi-Yong Li ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Facet Joint ◽  
Degenerative Lumbar Scoliosis ◽  
Element Analysis ◽  
Joint Stress ◽  
Lumbar Scoliosis
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