The effects of different articulate curvature of artificial disc on loading distribution

Hung Wen Wei, Yueh Feng Chiang, Yu Wen Chen, Cheng Kung Cheng, Yang Hwei Tsuang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Purpose: Deeper insights into the mechanical behavior of lumbar disc prostheses are required. Prior studies on the biomechanical performance of artificial discs were mostly performed with finite element analyses, but this has never been analyzed with altering articulate curvature. This study aimed to ascertain the influence of the geometry of a ball-and-socket disc prosthesis for the lumbar spine. Materials and Methods: Three-dimensional finite element model of human L4-L5 was reconstructed. Convex, concave, and elliptic artificial disc models were also established with Computer-Aided-Design software. Simulations included: (1) three articulate types of polyethylene (PE) insert were implanted inferiorly and (2) concave and convex PE inserts were implanted on the superior or inferior sides in flexion/extension, lateral bending, and axial rotation in the lumbar spine. Shear stresses and von Mises stresses on PE insert were assessed for their loading distributions. Results: High shear stresses of all articulate types occurred in flexion, and convex PE insert performed the maximum stress of 23.81 MPa. Under all conditions, stresses on concave PE inserts were distributed more evenly and lower than those on the convex type. Elliptic geometry enabled confining the rotation of the motion unit. The shear force on the convex PE insert on the inferior side could induce transverse crack because the shear stress exceeded yielding shear stress. Conclusions: The concave PE insert on the inferior side not only decreased loading concentration but had relatively low stress. Such a design may be applicable for artificial discs.

Original languageEnglish
Pages (from-to)107-112
Number of pages6
JournalJournal of Applied Biomaterials and Functional Materials
Volume10
Issue number2
DOIs
Publication statusPublished - 2012

Fingerprint

Polyethylene
Polyethylenes
Shear stress
Prostheses and Implants
Spine
Computer-Aided Design
Finite Element Analysis
Geometry
Prosthetics
Computer aided design
Software
Cracks

Keywords

  • Artificial disc
  • Finite element analysis
  • Lumbar spine
  • Total disc replacement

ASJC Scopus subject areas

  • Biophysics
  • Bioengineering
  • Biomedical Engineering
  • Biomaterials

Cite this

The effects of different articulate curvature of artificial disc on loading distribution. / Wei, Hung Wen; Chiang, Yueh Feng; Chen, Yu Wen; Cheng, Cheng Kung; Tsuang, Yang Hwei.

In: Journal of Applied Biomaterials and Functional Materials, Vol. 10, No. 2, 2012, p. 107-112.

Research output: Contribution to journalArticle

Wei, Hung Wen ; Chiang, Yueh Feng ; Chen, Yu Wen ; Cheng, Cheng Kung ; Tsuang, Yang Hwei. / The effects of different articulate curvature of artificial disc on loading distribution. In: Journal of Applied Biomaterials and Functional Materials. 2012 ; Vol. 10, No. 2. pp. 107-112.
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