Influence of Acetabular Liner Design on Periprosthetic Pressures during Daily Activities

Abstract

In this study, periacetabular pressures produced by different acetabular liner geometries were analyzed using Finite Element Method. The cup models consist of hemispherical metal shells fitted with normal and different chamfered polyethylene liner geometries, with the same degree of femoral head coverage. The aim of this study was to understand the influence of the design parameters of the chamfered liners, which are primarily designed to increase the range of motion (ROM) of the hip joint and reduce the risk of impingement, on the acetabular contact pressures. The cup models were loaded to simulate periacetabular pressures during routine activities. The proposed models have been analyzed considering a cup position of 40o lateral abduction and 15o anteversion. The results show that the difference in contact pressure between the normal and chamfer models was not substantial in the given orientation of the cup. Also, the increase of the chamfer angle has a small influence on the maximum contact pressures, although that could be also dependent on the reduction of the polyethylene thickness. Pre-clinical testing of total hip prostheses using Finite Element Method enables the evaluation of contact pressures and stress distribution, and proves to be a valuable tool to analyze the parameters reducing the contact pressure.

Adopted walking condition for computational simulation approach on bearing of hip joint prosthesis: review over the past 30 years

“…Several computational simulation software selected to conduct finite element analysis, like ANSYS [ 57 ], ABAQUS [ 65 ], COMSOL Multiphysics [ 38 , 54 ], MATLAB [ 44 ], Adams [ 66 ], and AnyBody Modelling System [ 67 ]. Both bearings of total hip arthroplasty and hip resurfacing have been studied, but mostly doing investigations on total hip arthroplasty [ 68 , 69 , 70 ]. Computational studies have been investigated to obtain results, whether on solid, fluid, or both domains.…”

“…[ 46 ] MATLAB v. 7.0 Total hip arthroplasty Contact pressure, sliding track. Cross-shear, and wear Physiological walking condition 3D load Paul [ 64 ] FE-AA-IER Johnston and Smidt [ 80 ] Full cycle Krepelka and Toth-Taşcău [ 70 ] ANSYS Total hip arthroplasty Contact pressure Simplified walking condition Static load Bergmann et al. [ 63 ] No motion − Peak loading Walking and stairs up/down Liu et al.…”

“…[ 119 ]. Some studies also only adopted walking condition at specific cycle times during peak loading such as the work of Krepelka and Toth-Taşcău [ 70 ], Uddin [ 112 ], and Wang et al. [ 116 ].…”