Biomechanical Simulation Analysis And Experimental Study Of Artificial Hip Joint Based On Finite Element Method

Accidents,lesions and other problems lead to functional impairment of the hip have greatly affected the work and life.At present,the main methods to solve this problem are total hip replacement and hemiarthroplasty.However,the commonly used clinical standard hip prosthesis does not meet the individual needs of the structure.The preparation methods of materials and processing and the improvement of the life of prosthesis and postoperative rehabilitation are needed further study.Therefore,it is crucial to treat hip problem under the support of rapid prototyping technology to design customized prosthesis that conforms to the physiological structure and to select reasonable materials to produce custom-made prostheses with excellent mechanical properties.At the same time,the flexible application of finite element technology in the field of biomechanics,the design of auxiliary prosthesis and mechanical properties evaluation is an effective means of biomechanics.The main research contents of this paper are as follows(1)The human body CT image data was obtained,and the medical image processing software was used to process the obtained image data.Medical image preprocessing,image segmentation and region increasing technique were applied to reconstruct the femur three-dimensional model and smooth its contour.The reconstructed three-dimensional structure of the femur can improve the accuracy of the judgment of the disease and plays a fundamental role to follow-up modeling.(2)Load bearing and muscle force loading conditions were analyzed.The reconstructed three-dimensional femoral model was used to established femur finite element model.Biomechanical simulation was carried out about state of both feet static standing and the peak load in gait cycle to stress analysis,stress shielding rate and deformation of femur.(3)In addition,free modal analysis of normal femur model was carried out to obtain femoral vibration mode and natural frequency preventing surgical failure when the implant is resonant or resonant with the femur.(4)Biomechanical analysis of the femur provides a favorable basis for the design of customized hip prostheses.To design a personalized custom prosthesis,the femoral prosthesis needs to be well matched with the femoral canal and the structure is reasonable.In this paper,two kinds of custom prostheses are designed based on the femoral canal contour:personalized prosthesis and bushing body.Simultaneously,prosthesis and femur were assembled simulating the clinical operation.The finite element model of the assembly was established,and the static analysis and modal analysis were performed under two kinds of exercise conditions.The stress,deformation,stress shielding rate and modal deformation of the two kinds of prosthesis was compared to determine the best femoral prosthesis model.(5)Ti6Al4V powder was sintered by laser sintering equipment and different laser scanning speed was set to make femoral prosthesis samples.Microscopic metallographic observation experiment,microhardness test,tensile performance evaluation experiment and friction wear test was performed on the samples.The performance of femoral samples at different scanning speeds was analyzed,and the personalized prosthesis samples at the optimal scanning speed were obtained to meet the needs of the human femur for tensile strength,hardness and wear resistance providing reference value for the preparation,design and safety evaluation of artificial prostheses.