DESIGN OF PROSTHETIC FEMORAL STALK BASED ON PARALLEL TOPOLOGY OPTIMIZATION

The prosthetic stalk contacting with the femur is the main component of the artificial hip joint and plays an important role in total hip replacement surgery.The topology optimization method of solid isotropic material with penalization(SIMP)and the multi⁃scale parallel topology optimization method were used to obtain the two femoral⁃stalk structures of type A and type B,and the sensitivity of the two femoral stalks to the change of load direction was compared with the amplitude of the flexibility of the femoral stalk structure as a comparison index.The finite element method was used to analyze the stress of the corresponding femur under multiple conditions of type A femoral stalk and type B femoral stalk.The results show that under the three working conditions,the average stress of type A femoral stalk and type B femoral stalk to the femur is 14.80,22.55,16.94 MPa and 10.89,20.92,16.50 MPa.The pressure loading experiment was performed on a type B femoral stalk.The experimental results show that for the inner measurement point,the average error between the strain values and simulated values of this experiment is-1682με,and the average relative error is 20.3%.For the outer measurement point,the average error between the strain values and the simulated values is 1281με,and the average relative error is 19.5%.This method provides an effective reference for the reliablilty design of the femoral prosthesis stalk structure.