Numerical analysis of the biomechanical complications accompanying the total hip prosthesis: prosthetic bone remodeling and migration

作者：Behrens B A; Bouguecha A; Vucetic M; Escobar S Betancur; Stukenborg Colsman C; Lerch M; Nolte I; Almohallami A^*

来源：Materialwissenschaft und Werkstofftechnik, 2015, 46(9): 881-893.

DOI：10.1002/mawe.201500395

• Bone remodelling
• cup migration
• Finite-Element-Analysis
• DEXA
• validation
• multi body simulation

Aseptic loosening of the prosthesis is still a problem in artificial joint implants. The loosening can be caused by, among other factors, resorption of the bone surrounding the prosthesis owing to stress shielding. A numerical model was developed at the Institute of Forming Technology and Machines, Leibniz Universitat Hannover, in order to anticipate the bone remodelling process according to the stress shielding. This study is carried out to validate this model by means of DEXA- as well as CT-clinical studies on patients with different kinds of prostheses and use it to map the cup migration. The model was applied to the periprosthetic femur and pelvis. In both cases it shows very good results. With a mean difference of 12% in case of the femur and 6.8% in case of the pelvis the numerical bone remodelling model is successfully validated. A new method is developed to map the prosthetic migration in the pelvis. Using mechanical relationships and remeshing regulations the finite-element-analysis (FEA) calculates the possible migration of the cup in pelvis. This method was applied to polyethylene cup and showed good results in comparison with a clinical study. In order to increase the accuracy of the numerical model, the difference in hip contact forces caused by the migration of the cup is calculated by multi body simulation and embedded in the FEA using online coupling software developed by our scientific group.

• 出版日期2015-9