Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 13, 2020 - September 16, 2020
This study aims to investigate loosening behavior of acetabular cup under different loading condition with the presence of interfacial fracture. After long term service, dislocation, aseptic loosening result in decrease in hip joint quality and severe pains to patients which lead to the need for revision surgery. Dislocation mainly affected by mechanical factors such as stress state or interfacial damage. In order to investigate dislocation of acetabular cup, 3 dimensional model of acetabular cup structure including jig, simulated bone, acetabular cup and stem head of artificial hip joint was developed using finite element analysis software. The breakage of cup-bone bonding initiated at contact edged due to geometrical singularities. Moreover, an increases in vertical displacement of acetabular cup was induced by interfacial delamination. Three types of delamination propagation at the different regions of the acetabular cup resulted by different loading modes was revealed by using fracture mechanic approach. Opening modes of delamination was developed due to the change in loading amplitude which significantly enhanced the risk of loosening.
