Optimization of Frictional Heating Parameters of Artificial Joint Materials by Taguchi Approach

Binnur Sagbas, M. Numan Durakbasa

Abstract

Previous measurements of frictional temperature rise on the surfaces of artificial joints have shown that temperature values could reach high levels that make hazardous effects on surrounding tissue and lubricant around the artificial joint. For reduction of this thermal damage, testing parameters and their effects were investigated by using Taguchi method and analysis of variance. Vitamin E blended ultra high molecular weight polyethylene (VE-UHMWPE) was used for acetabular inserts. These inserts were paired with CoCrMo femoral heads. In vitro frictional heating measurements were carried out on a custom made hip joint friction experimental set-up. 0.3 mm and 0.5 mm in diameter surface dimples were machined on the inner surface of acetabular cup samples. Different static loading, representing different body weights, applied with different walking duration. Bovine calf serum was used as lubricant and different amount of bone cement (PMMA) was added in the lubricant as third body abrasive particles. Temperature rises were recorded with embedded thermocouples. The experimental results demonstrated that the surface dimples were the major parameter on frictional heating, followed by applied load, amount of third body particles and time.

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IMEKO TC

TC10 - Measurement for Diagnostics, Optimization and Control

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