Subject-specific finite element model with an optical tracking system in total hip replacement surgery.
Intra-operative peri-prosthetic femoral fractures are a significant concern in total hip arthroplasty and can occur at any time during surgery, with the highest incidence during implant insertion. This study combines subject-specific finite element analysis modeling with an optical tracking system to characterize the resultant strain in the bone and results of impaction during total hip replacement surgery. The use of ABG II femoral stem (Stryker Orthopaedics, Mahwah, NJ, USA) in the model yielded the following results. Hammer velocity was measured experimentally using a three-dimensional optical tracking system and these data were input into the finite element analysis model so that intra-operative loading scenario could be simulated. A quasi-static explicit simulation and a dynamic loading step using two implant-bone interface friction (0.1 and 0.4 friction coefficients) states were simulated. The maximum swing velocity of a mallet was experimentally measured at 1.5 m/s and occurred just before impaction of the hammer with implant introducer. Two friction states resulted in different results with the lower friction coefficient generating higher strains in the anterior regions of the model and higher displacement of the implant with respect to the femur when compared to the high friction state.
Biomedical Engineering, AMME, The University of Sydney, Sydney, NSW, Australia.
Brad
B
Miles
Biomedical Engineering, AMME, The University of Sydney, Sydney, NSW, Australia Elizabeth.Kolos@hotmail.com.
Elizabeth
E
Kolos
Specialist Orthopaedic Group, Wollstonecraft, NSW, Australia.
William L
WL
Walter
The Australian School of Advanced Medicine, Macquarie University, Sydney, NSW, Australia.
Richard
R
Appleyard
Biomedical Engineering, AMME, The University of Sydney, Sydney, NSW, Australia.
Qing
Q
Li
TechSIM, Beijing, China.
Youngang
Y
Chen
Biomedical Engineering, AMME, The University of Sydney, Sydney, NSW, Australia.
Andrew J
AJ
Ruys
D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation* / Q000379:methods*; D003198:Computer Simulation; D020342:Finite Element Analysis; D017276:Friction; D006622:Hip Prosthesis; D006801:Humans; D011474:Prosthesis Design; D013314:Stress, Mechanical; D025321:Surgery, Computer-Assisted / Q000295:instrumentation* / Q000379:methods*
Finite element model; dynamic loading; optical tracking