Three Dimensional Finite Element Analysis Of Femoral Proximal Diaphysis Prosthesis Under Common Gait

Proximal femur is one of the main locations of bone tumors and pathological metastases and fractures.Currently,segmental resection is the first choice for treating bone tumors.After the resection of the tumor,the main method of artificial limb reconstruction is building the artificial weight of the bone defect.With the progress of computer technology and the improvement of surgical techniques,prosthesis reconstruction has become the main method of limb salvage for bone tumors.Currently,backbone of modular prostheses are getting more and more attentionin clinical medicine field,the backbone of the group with type prosthesis has been applied in clinical medicine gradually.However,under common activities,the biomechanical properties of femoral and backbone prostheses are unclear,which limits the further application of backbone component prosthesis in clinic.This study designs a new type of component prosthesis based on the unique physiological structure of the proximal femur.The research content and results can be divided into two aspects:Human femur model was established by using the CT tomography data method according to a normal male CT data.A new type of component prosthesis suitable for clinical application is designed according to the human femur model and the special structure of the proximal femur.The combination prosthesis has the advantages of convenient operation,full weight bearing,low infection rate,long service life and small repair chance after operation.The femur diaphysis combined prosthesis model was established according to the simulated clinical operation.Modeling in Rhino and the combination of femur and prosthesis also provide a possibility for 3D modeling of clinical medicine and provide a plan for subsequent design of proximal femoral backbone prosthesis.The design and optimization of prosthesis provide important data guidance and scientific basis for follow-up clinical medicine in this study.The stress distribution changes of the femur diaphysis combined prosthesis were analyzed under four common gait.The daily life of four kinds of gait as the research object,the typical time of each gait cycle in a total of thirteen typical moments as the research object,the mechanical properties and the corresponding conditions of these thirteen cases of femoral diaphyseal group with implants of the femoral shaft stress distribution were calculated.The results showed that four kinds of gait under the thirteen conditions of femoral diaphyseal modular implant stress distribution with femoral in the current operating conditions of the stress distribution variation in a single gait cycle,the stress mainly concentrated in the middle and distal femoral shaft and extends from the middle of the femur to the end the stress decreases gradually.The stress received from the location of the bone cement at the junction of the joint prosthesis to the femur is larger than that in other positions.The variation of stress distribution in the four cycles is relatively obvious.