The analysis of wear on artificial hip joint with dimple on femoral surface

Abstract

This paper proposes the replacement of artificial hip joints which is one of the successful methods used to restore the movement of damaged hip bones. The main contribution of this work is to reduce wear caused by contact pressure between the femoral head and acetabular cup surfaces, where the average wear rate is very high. This can be achieved through the use of dimple on the femoral head surface from the artificial hip joint and subsequently computed by using the Archard equation. To validate the contact pressure accuracy of the proposed model, mesh sensitivity that used with 3 levels of mesh size are 1.2, 1.1 and 1.0. In this study for more accurate result, the mesh sensitivity used is with the mesh size of 1.0. The performance calculation results from wear are shown that in a hip joint using dimple the maximum contact pressure and the wear depth are decreased compared to the hip joint without dimple which are 67.25 MPa and 1.064 x10-10 mm from the previous value of 77.44 MPa and 1.185 x10-10 mm. Therefore, based on differences in the distribution of contact pressure that occurs shows volumetric wear on the hip joints using a dimple lower than without a dimple.