Mechanical evaluation of the artificial hip joint with a structure for preventing the dislocation

Abstract

Total hip arthroplasty (THA) has various problems to be resolved. For example, joint dislocation is one of the most common deuteropathies associated with THA. In the present study, we focused on the pull-out force as a shape parameter for preventing the dislocation, and the pull-out forces were calculated using the finite element method (FEM). Firstly, we determined the relationship between the height of acetabular cup over half sphere line (inset part) and the maximum pull-out force. Secondly, we compared between analytical and experimental values. From the analytical results, the maximum pull-out force increased with the increase of the inset height. The analytical value was similar to the experimental one. Therefore, we suggested that the height of inset is a significant parameter in order to optimally design the artificial hip joint with a structure for preventing the dislocation.