Mesh morphing for finite element analysis of implant positioning in cementless total hip replacements
Bah, Mamadou T., Nair, Prasanth B. and Browne, Martin Browne (2009) Mesh morphing for finite element analysis of implant positioning in cementless total hip replacements. Medical Engineering and Physics, 31, (10), 1235-1243. (doi:10.1016/j.medengphy.2009.08.001).
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Description/Abstract
Finite element (FE) analysis of the effect of implant positioning on the performance of cementless total hip replacements (THRs) requires the generation of multiple meshes to account for positioning variability. This process can be labour intensive and time consuming as CAD operations are needed each time a specific orientation is to be analysed. In the present work, a mesh morphing technique is developed to automate the model generation process. The volume mesh of a baseline femur with the implant in a nominal position is deformed as the prosthesis location is varied. A virtual deformation field, obtained by solving a linear elasticity problem with appropriate boundary conditions, is applied. The effectiveness of the technique is evaluated using two metrics: the percentages of morphed elements exceeding an aspect ratio of 20 and an angle of 165° between the adjacent edges of each tetrahedron. Results show that for 100 different implant positions, the first and second metrics never exceed 3% and 3.5%, respectively. To further validate the proposed technique, FE contact analyses are conducted using three selected morphed models to predict the strain distribution in the bone and the implant micromotion under joint and muscle loading. The entire bone strain distribution is well captured and both percentages of bone volume with strain exceeding 0.7% and bone average strains are accurately computed. The results generated from the morphed mesh models correlate well with those for models generated from scratch, increasing confidence in the methodology. This morphing technique forms an accurate and efficient basis for FE based implant orientation and stability analysis of cementless hip replacements
| Item Type: | Article |
|---|---|
| ISSNs: | 1350-4533 (print) |
| Related URLs: | |
| Subjects: | T Technology > T Technology (General) R Medicine > R Medicine (General) |
| Divisions: | University Structure - Pre August 2011 > School of Engineering Sciences > Bioengineering Sciences University Structure - Pre August 2011 > School of Engineering Sciences > Computational Engineering and Design |
| Item ID: | 71582 |
| Date Deposited: | 15 Dec 2009 |
| Last Modified: | 01 Jun 2011 02:59 |
| Contributors: | Bah, Mamadou T. (Author) Nair, Prasanth B. (Author) Browne, Martin Browne (Author) |
| Date: | December 2009 |
| Status: | Published |
| Contact Email Address: | P.B.Nair@soton.ac.uk |
| URI: | http://eprints.soton.ac.uk/id/eprint/71582 |
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