Abstract: Objective: To apply the finite element method to simulate the stress concentration and displacement of different hip prostheses in total hip arthroplasty, to analyze the clinical outcomes of prosthesis subsidence and loosening after surgery with these two indicators, and to provide reference for clinical surgeons.Methods: The three-dimensional hip from the hip CT data of a normal male volunteer was reconstructed.Two types of prosthesis models were built (Corail and Synergy porous).The femoral heterogeneous properties were assigned by Mimics, ABAQUS and other softwares.The stress concentration and displacement changes of two hip prostheses in the posture of standing were analyzed.Results: The maximum stress of Corail and Synergy porous hip prostheses was mostly concentrated in the one third of distal end and the proximal corner, and the maximum stresses were 31.82 and 55.05 MPa, respectively, which were less than the femoral yield strength (138 MPa). The maximum relative displacements of Corail and Synergy porous prosthesis models were 0.604 and 0.747 mm, respectively, which were less than the ultimate displacement (1.500 mm).The results above met the hip replacement standards.Conclusion: Corail stem prosthesis has a better behavior in stress concentration and displacement than Synergy porous prosthesis by finite element analysis. The finite element analysis of different hip prosthesis may provide the important references for the prognosis of total hip arthroplasty.

Key words: total hip arthroplasty, femur stem, finite element analysis, stress distribution, face contact