The effect of cup outer sizes on the contact mechanics and cement fixation of cemented total hip replacements

Article

Hua, X., Li, J., Wang, L., Wilcox, R., Fisher, J. and Jin, Z. 2015. The effect of cup outer sizes on the contact mechanics and cement fixation of cemented total hip replacements. Medical Engineering and Physics. 37 (10), pp. 1008-1014. https://doi.org/10.1016/j.medengphy.2015.08.003
TypeArticle
TitleThe effect of cup outer sizes on the contact mechanics and cement fixation of cemented total hip replacements
AuthorsHua, X., Li, J., Wang, L., Wilcox, R., Fisher, J. and Jin, Z.
Abstract

One important loosening mechanism of the cemented total hip arthroplasty is the mechanical overload at the bone-cement interface and consequent failure of the cement fixation. Clinical studies have revealed that the outer diameter of the acetabular component is a key factor in influencing aseptic loosening of the hip arthroplasty. The aim of the present study was to investigate the influence of the cup outer diameter on the contact mechanics and cement fixation of a cemented total hip replacement (THR) with different wear penetration depths and under different cup inclination angles using finite element (FE) method. A three-dimensional FE model was developed based on a typical Charnley hip prosthesis. Two acetabular cup designs with outer diameters of 40 and 43 mm were modelled and the effect of cup outer diameter, penetration depth and cup inclination angle on the contact mechanics and cement fixation stresses in the cemented THR were studied. The results showed that for all penetration depths and cup inclination angles considered, the contact mechanics in terms of peak von Mises stress in the acetabular cup and peak contact pressure at the bearing surface for the two cup designs were similar (within 5%). However, the peak von Mises stress, the peak maximum principal stress and peak shear stress in the cement mantle at the bone-cement interface for the 43 mm diameter cup design were predicted to be lower compared to those for the 40 mm diameter cup design. The differences were predicted to be 15-19%, 15-22% and 18-20% respectively for different cup penetration depths and inclination angles, which compares to the clinical difference of aseptic loosening incidence of about 20% between the two cup designs.

Research GroupBiophysics and Bioengineering group
PublisherElsevier
JournalMedical Engineering and Physics
ISSN1350-4533
Publication dates
Online04 Sep 2015
Print03 Oct 2015
Publication process dates
Deposited05 Jun 2017
Accepted03 Aug 2015
Output statusPublished
Accepted author manuscript
License
Copyright Statement

© 2015. This author accepted manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/

Digital Object Identifier (DOI)https://doi.org/10.1016/j.medengphy.2015.08.003
LanguageEnglish
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