Study And Experiment On Rehabilitation Methods To Improve Total Hip Arthroplasty

The main goal of total hip arthroplasty is to maximally restore the patient's mobility and activity,extend the hip replacement life and reduce the rate of repairing.In terms of total hip arthroplasty,surgical techniques are already mature.The final success of total hip arthroplasty is closely related to the quality of postoperative proximal osseointegration.Proximal osseointegration is the basis for successful surgery,while distal high matching is a necessary condition for successful surgery.During surgical rehabilitation,proximal osseointegration depends on the transmission of force.When the force on the prosthesis cannot be transmitted to the proximal femur,the proximal femur will produce osteolysis,which cannot make the prosthesis and the femur to form a good integration.The prosthesis in the medullary cavity is not stable enough to cause the aseptic loosening of the prosthesis.In the long-term stable phase,when the force on the prosthesis is too large,the excessive transmission of the force to the proximal femur will destroy the proximal osseointegration area of the prosthesis and affect the long-term stability of the prosthesis in the medullary cavity.Therefore,how to accurately control the force transmission is the key to total hip arthroplasty.The existing rehabilitation methods lack the guidance of femoral force transmission after implantation,and cannot effectively promote the formation of proximal osseointegration.In this paper,the law of force transmission on femur after implantation was studied.Based on CT images of femur,the three-dimensional solid model of femur was established by reverse engineering.The position and angle of the femur and the prosthesis were calculated by using the image processing technique,which provides the parameters for the establishment of the finite element analysis model.The model of the femur was accurately modeled and then registered with the prosthesis model.The shape of the hip joint was restored accurately.The finite element analysis was used to analyze the force distribution of the matched model,and the stress distribution and stress transmission way of the femur were obtained,then the law of force transmission on the femur was sought and the loading force on the prosthesis which could be exactly transmitted to the proximal femur was obtained.In this paper,in order to solve the problem of force transfer on the femur,two type of feedback rehabilitation instruments was developed to strictly control the loading force on the prosthesis based the law of force transmission on the femur and proximal osseointegration conditions.First of all,based on the physiological structure of the human body and the law of the force transmission on femur,the structural design and production of force feedback instruments were completed.Then the Lab VIEW control system was programmed and the test system platform was completed to test the performance of force feedback rehabilitation instruments.The results showed that the force feedback control instruments developed in this paper have significant control effect on the loading force of the prosthesis.