不同运动状态下锆铌合金髋关节假体植入前后的股骨应力分析OA

Objective To investigate the differences in femur stress distribution under five motion states(slow walking,normal-paced walking,fast walking,ascending stairs and descending stairs)before and after the implantation of a zirconium-niobium alloy hip joint prosthesis,and to analyze the stress shielding of the proximal femur after implantation.Methods Firstly,a 3D femoral solid model was constructed with such software as Mimics,Geomagic and SolidWorks,and the post-osteotomy femoral model was assembled with a zirconium-niobium alloy hip joint prosthesis model.Secondly,the assembled model was imported into ABAQUS software for finite element simulation analysis,and loads were applied to the femur to analyze the stress levels of the femur after hip joint prosthesis implantation under five motion states:fast walking,normal-paced walking,slow walking,ascending stairs and descending stairs.Finally,based on the geometric characteristics the femur was divided into 7 zones using the Gruen zoning method and the stress shielding of each zone was analyzed.Results The finite element simulation results showed that the femur stress after the implantation was higher than that before the prosthesis was grafted under the five motion states and high stress existed in the proximal femur in the state of ascending stairs;different degrees of stress shielding occurred at greater trochanter and lesser trochanter of proximal femur:the stress shielding at greater trochanter was more significant with the stress shielding rate ranging from 10.9%to 14.1%,while stress shielding was almost absent in middle and distal femur.Conclusion Under the five motion states of slow walking,normal-paced walking,fast walking,ascending stairs and descending stairs the implantation of the zirconium-niobium alloy hip joint prosthesis improves effectively the femur stress environment and relieves the femur stress shielding.[Chinese Medical Equipment Journal,2026,47(1):35-41].