Relation between pull-out forces and load directions of artificial hip joints to prevent dislocation

Abstract

An artificial hip joint is a medical implant which used for total hip arthroplasty. There are several issues for the artificial hip joint. For example, dislocation is one of crucial issues. We proposed a new artificial hip joint with the structure for preventing dislocation. Dislocation dose not easily occur due to the artificial femoral head covered with the acetabular cup over the half sphere line. In this study, the pull-out forces were estimated using finite element analysis. A finite element model was constructed by software (ANSYS 17.2). For analytical condition, the acetabular cup was restricted and the femoral head was pulled out from the acetabular cup with various pull-out directions (0, 30, 60, 90 degrees).In the case of 90 degrees, the pull-out force was lower than that in case of other pull-out directions. From this result, we obtained a design guideline for the artificial hip joint.