A combined RSA and FE study of the implanted proximal tibia: correlation of the post-operative mechanical environment with implant migration


Perillo-Marcone, A., Ryd, L., Johnsson, K. and Taylor, M. (2004) A combined RSA and FE study of the implanted proximal tibia: correlation of the post-operative mechanical environment with implant migration. Journal of Biomechanics, 37, (8), 1205-1213. (doi:10.1016/j.jbiomech.2003.12.004).

Download

Full text not available from this repository.

Description/Abstract

There is strong evidence to suggest that inducible displacements, migration and implant loosening are closely related to the initial mechanical environment of the implanted tibia. If this is true, then it should be possible to predict the likelihood of implant migration using patient-specific finite element models. Finite element models of the proximal implanted tibiae were analysed based on pre-operative quantitative computed tomography data of four patients entered into a radiographic migration study. These four patients were also part of an radiostereometric analysis (RSA) study. A variety of load cases were analysed and the risk of bone failure determined for a 2 mm layer of bone immediately beneath the tibial tray. The results were compared with the RSA data measured 1 year post-operatively for each patient. For each patient, an appropriate load case was selected based on patient weight and on the varus–valgus migrations observed in the migration study. The two patients with press-fit implants were predicted to have the highest risk of failure and were found to migrate the most. The two patients with bonded implants (one HA coated and one cemented) were found to have a low risk of failure and these implants migrated the least.

This study suggests that the degree of implant migration is dependent on the initial mechanical environment and can be determined using patient-specific finite element analysis.

Item Type: Article
ISSNs: 0021-9290 (print)
Related URLs:
Keywords: total knee replacement, finite element analysis, rsa
Subjects: R Medicine > RD Surgery
T Technology > TA Engineering (General). Civil engineering (General)
R Medicine > RM Therapeutics. Pharmacology
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 22847
Date Deposited: 23 Mar 2006
Last Modified: 27 Mar 2014 18:12
Contact Email Address: mtaylor@soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/22847

Actions (login required)

View Item View Item