Objective To investigate the mechanical and displacement changes of triply-periodic minimal surface(TPMS)structure type femoral implant prosthesis in the host.Methods The biomechanical simulation models of P,D,G and S surface structures implant prostheses were designed,and the stress and displacement change trends of four types of composite surface structures combined with the femur were observed.Results The stress distribution trend of the four composite surface structures were consistent,and the stress concentration was mainly distributed in femoral prosthesis and the middle femur,with little difference in the distal stress.The maximum stress of bone trabeculae with composite P,D,G and S surface structure was 252.8,731.2,845.4 and 944.1 MPa,respectively.The stress distribu-tion of bone trabeculae with composite P surface structure was more uniform,and the stress of composite S surface structure was the largest.The maximum displacements of the composite P,D,G and S surface structures was 0.030 0,0.034 0,0.033 2 and 0.029 2 mm,respectively,and the maximum displacement of the four composite surface struc-tures were all greater than the displacement(0.025 9 mm)of normal femur under normal stress.Conclusions The four types of composite surface structures do not change the stress distribution and displacement distribution of the whole femur,but only change the stress magnitude,and the joint of the prosthesis and femur bear the main stress.TPMS structure has exquisite and complex structural design properties,good anatomical matching and mechanical con-ductivity,smaller displacement transformation and higher mechanical stability.
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