Finite Element Analysis Of Acetabulum Prosthesis Implanting Angle In Total Hip Arthroplasty

BackgroundTotal hip arthroplasty (THA) has become a routine surgery in the treatment of severehip diseases. The placement of implants has always been a hot topic of research in thestudies of total hip replacement, especially the implanting position of abduction angle andanteversion angle.ObjectiveResearch of the acetabular component’ construction method of three-dimensionalfinite element model in THA with different angles, and study the stress and the influence ofpolyethylene liner wearing with finite element analysis.MethodsBuild a model in3D modeling software system HYPERMESH according to theartificial hip joint prosthesis’ entities and data. Using finite element analysis system:ABAQUS6.11reconstitute acetabular prosthesis after hip replacement joints underdifferent implanting position angle. Simulation and load the joint load when sheet foottouchdown state. Calculation the stress distribution of acetabular cup and the interfacestress distribution and plastic volume strain and fatigue fracture.ResultsConstructed of hip prosthesis three-dimensional finite element model can be a verygood reaction of the prosthesis’ geometric shape and biomechanical characteristics afterimplantation.Contact stress occurred in femoral head prosthesis and with correspondingtop vault of polyethylene acetabulum. The two groups of combination of abduction angle50°vs anteversion angle10°and abduction angle55°vs anteversion angle15°havebeen found relatively low stress value (3.293MPa,3.758MPa) and the smaller theinterface plastic strain and fatigue fracture volume value (2.241x10-7m3,2.443x10-7m3)respectively. The material factors influencing the internal stress of acetabular lining and the functional exercise postoperatively influence on the interface stress also been discussed.The study may provide theoretical basis for clinical application.ConclusionThree dimensional finite element model of implanting acetabular prosthesis bydifferent placed angles was established of high simulation according to the artificial hipjoint prosthesis’ entities and data. The model could been analysed simulated biomechanicalwithin hip joint after THA, which cannot been done on the patients. Innovative usinginterface plastic strain and fatigue fracture zone volume reflect long-term mechanicalwearing process of polyethylene liner postoperatively.The study provide theoreticalguidance to installation of acetabular prosthesis and theoretical basis for clinicalapplication.