Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 13, 2020 - September 16, 2020
The number of artifical hip prostheses is increasing due to the super-aging society. Interfacial damages in HAp (Hydroxyapatite) coating on acetabular cup or damages in surrounding human bone can lead to release of mechanical fixation by surrounding cancellous bones, which is a major cause of loosening. However, the mechanism of loosening by such the damages was not sufficiently revealed yet. The aim of this study is to experimentally clarify the damage behavior of HAp coating on the surface of acetabular cup by cyclic loading using AE (Acoustic Emission) method and IR (Infrared thermography) method. The elastic wave at the time of coating damage near the edges was measured by AE method. Moreover, the temperature change due to friction and wear near the parietal surface was measured by IR method. The degree of coating damage was quantified by evaluating the temperature change caused by friction. It was clarified that delamination, friction and wear occurred step by step between simulated bone and acetabular cup. The mechanism of promoting loosening at the interface of simulated bone and acetabular cup was also discussed.
