Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/36282
Title: Does location of rotation center in artificial disc affect cervical biomechanics?
Authors: Mo, ZJ
Zhao, YB
Du, CF
Sun, Y
Zhang, M 
Fan, YB
Keywords: Cervical disc replacement
Rotation center
Cervical kinematics
Stiffness
Facet stress
Issue Date: 2015
Publisher: Lippincott Williams & Wilkins
Source: Spine, 2015, v. 40, no. 8, p. E469-E475 How to cite?
Journal: Spine 
Abstract: Study Design. A 3-dimensional finite element investigation. Objective. To compare the biomechanical performances of different rotation centers (RCs) in the prevalent artificial cervical discs. Summary of Background Data. Various configurations are applied in artificial discs. Design parameters may influence the biomechanics of implanted spine. The RC is a primary variation in the popular artificial discs. Methods. Implantation of 5 prostheses was simulated at C5-C6 on the basis of a validated finite element cervical model (C3-C7). The prostheses included ball-in-socket design with a fixed RC located on the inferior endplate (BS-FI) and on the superior endplate (BS-FS), with a mobile RC at the inferior endplate (BS-MI), dual articulation with a mobile RC between the endplates (DA-M), and sliding articulation with various RCs (SA-V). The spinal motions in flexion and extension served as a displacement loading at the C3 vertebrae. Results. Total disc replacements reduced extension moment. The ball-in-socket designs required less flexion moment, whereas the flexion stiffness of the spines with DA-M and SA-V was similar to that of the healthy model. The contributions of the implanted level to the global motions increased in the total disc replacements, except in the SA-V and DA-M models (in flexion). Ball-in-socket designs produced severe stress distributions in facet cartilage, whereas DA-M and SA-V produced more severe stress distribution on the bone-implant interface. Conclusion. Cervical stability was extremely affected in extension and partially affected in flexion by total disc replacement. With the prostheses with mobile RC, cervical curvature was readjusted under a low follower load. The SA-V and BS-FS designs exhibited better performances in the entire segmental stiffness and in the stability of the operative level than the BS-MI and BS-FI designs in flexion. The 5 designs demonstrated varying advantages relative to the stress distribution in the facet cartilages and on the bone-implant interface.
URI: http://hdl.handle.net/10397/36282
ISSN: 0362-2436 (print)
1528-1159 (online)
DOI: 10.1097/BRS.0000000000000818
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

3
Last Week
2
Last month
Citations as of Jan 10, 2017

WEB OF SCIENCETM
Citations

3
Last Week
0
Last month
Citations as of Jan 15, 2017

Page view(s)

9
Last Week
0
Last month
Checked on Jan 15, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.