Investigation of loosening behavior of acetabular cup with respect to different loading condition using Finite Element Analysis

抄録

This study aims at investigating loosening behavior of an acetabular cup by interfacial damages. Super-aging society is one of the most popular problems in developed country such as Japan. As a consequence, the need for reliable and durable artificial hip joint replacement also increase since its life span is still a noticeable issue. Among the factors affecting service life, interfacial damage phenomenon have a high impact on dislocation of acetabular cup which lead to loosening of the acetabular cup. In order to investigate effect of interfacial damage on dislocation of acetabular cup, 3 dimensional model of acetabular cup structure was used. Interfacial crack growth was simulated using fracture mechanics model. Validation of stress distribution with theoritical model support the use of fracture mechanic. With higher loading amplitude, the interfacial crack growth mechanism varied which induced an increases in vertical displacement of acetabular cup. The risk of loosening of acetabular cup was quantified using safezone concept.