Wear Prediction of UHMWPE Cup Against Commercially Pure Titanium Hip Implant With The Nonlinear Load and Contact Area Wear Equation

International Conference on Design and Application of Engineering Materials in conjunction with Seminar Nasional Metalurgi dan Material XI (SENAMM)

材料科学;金属学

Handoko^1 ; Suyitno^1 ; Dharmastiti, Rini^1 ; Magetsari, Rahadyan^2

Department of Mechanical and Industrial Engineering, Faculty of Engineering, Universitas Gadjah Mada, Indonesia^1

Department of Orthopedics and Traumatology, Sardjito General Hospital, Faculty of Medicine, Universitas Gadjah Mada, Indonesia^2

关键词: Arthritis patients;    Coefficient of frictions;    Commercially Pure titaniums;    Computation model;    Finite element software;    Hip implants;    Nonlinear relations;    Wear prediction;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/547/1/012015/pdf
DOI  :  10.1088/1757-899X/547/1/012015

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Hip implants are prostheses designed for severe hip arthritis patients. One of its components, acetabular cup is mostly made from ultra-high molecular weight polyethylene (UHMWPE). This polymer has a wear problem. Its debris would cause osteolysis followed by implant failures. Numerical studies of this problem were commonly used a linear contact pressure wear equation. Recently it was found not suitable to model the polymer wear in hip implants. This study used a nonlinear equation to predict the UHMWPE volumetric wear. It states a nonlinear relation between wear, load and contact area. The computation model was a biaxial rocking motion hip simulator assembly with UHMWPE acetabular cup sliding on commercially pure titanium femoral head. Multidirectional pin on disc experiments conducted to obtain wear factor and coefficient of friction data for the computations. Commercial finite element software calculated the other parameters. Predicted volumetric wear has a good agreement with the experimental data. Lowest numerical error was found 0.53 %.