| Objective: The knee joint is the largest joint of human body.The healthy knee joint is the basis of human’s free activity.It is an important guarantee for people’s normal life and plays an important role in people’s daily life.Knee joint wear and degeneration are common in life.With the development of medical technology,especially the progress of Department of orthopedics,people pay more and more attention to the health of knee joint.As an important joint of the lower limbs of the human body,the knee joint bears all the weight of the body.It is very difficult to study the biomechanics of its skeleton,which has the characteristics of complex combination,irregular shape,and many human activities.At the same time,the knee joint has movement function,participate in body weight,and the incidence of degenerative osteoarthrosis of the lower extremities is up to 26.57%.The structure of knee joint is very close,and its mechanical function is achieved through the cooperation of surrounding bones,soft tissues and ligaments.It is of great significance in the daily life of human body.Because the frequency of knee joints in human activities is relatively high,it is easy to cause structural instability due to various injuries,resulting in swelling,heat pain and other symptoms.3D reconstruction technology is a new technology in the field of biomechanics.It can simulate the problems that can not be solved in reality,and use finite element method to simulate the complex structure of human body.Compared with traditional mechanics research,the finite element method can simulate more accurately,and then carry out the next experiment to make up for the shortcomings of traditional mechanics in the research of complex joints,so it has very high application value in medical field.The stress distribution on the meniscus and cartilage of the knee can be effectively obtained by the finite element method.Based on the geometric structure of the research object,a biomechanical model is constructed based on the geometric structure of the research object.After loading the appropriate material property,load and boundary conditions are loaded,and the force analysis and motion analysis of the research object are carried out.Compared with the traditional method,easy to obtain,the specimen can be used repeatedly with the superiority of the experimental specimen of finite element analysis method,and can obtain the in vitro experiment is not easy to get the data,such as the meniscus and cartilage stress and strain,the joint between the contact force and contact area,therefore,the finite element analysis method has become a reliable means of joint biomechanics.The three-dimensional finite element model can not only greatly reduce the manpower and financial resources of biomechanical research,but also repeat experiments and set different assumptions to avoid the cumbersome calculation process of traditional mechanics.In addition,3D graphics obtained by related devices can be observed through different perspectives,and all structures can be split and combined in computer,and multiple sets of results can be obtained for comparative analysis,which effectively avoids the limitation of simple specimen observation.All kinds of advantages show the great application value of 3D finite element model in medical field.In order to further explore the biomechanical properties of the 3D reconstruction of the knee joint of patients before,the finite element model is established,and the total knee osteotomy simulation,discuss the influencing factors of the mechanical stability,provide an effective basis for clinical diagnosis and late degenerative knee osteoarthritis treatment and rehabilitation.Methods: From June 2014 to June 2017 in our hospital,patients with osteoarthrosis of late degenerative knee were randomly divided into two groups: the experimental group and the control group,the experimental group was 3DPP-mediated total knee arthroplasty,and the control group was the traditional two-dimensional measurement guide total knee arthroplasty operation method.The study group was 55-69 years old and operated.Equivalent parameters.After the data is collated,the parameter correlation is analyzed for T and P data statistics.Results: The bleeding 3DPP mediated by total knee arthroplasty in the average amount of 332.2ml,the average operation time was 2.14 hours,the traditional two-dimensional measurement to guide the hemorrhage of total knee arthroplasty in the average amount of 359.4ml,the average operation time was 2.32 hours,the experimental group and the control group operation time T test(P < p=0.038 0.05),the experimental group can significantly shorten the operation time,the experimental group and the control group bleeding T test =p=0.052(P > 0.05),the experimental group compared with control group significantly reduce the amount of bleeding,postoperative March AKSS score,the experimental group and the control group scores were: pain 47.75 + 1.05vs45.3 + 1.55,22.45 + 1.05Vs20.4 + 1.36 stability,activity 23.50 + 1.23vs19.6 + 1.43,45.5 + 1.63vs41.5 + 1.63 walking down the stairs,44.6 + 2.37vs40.55 + 1.27.T test pain after P=0.0023,the stability of P=0.0049,live Dynamic P=0.0008,P=0.0016 walking down the stairs,P=0.0075(P < 0.05),with statistical significance,indicating total knee arthroplasty mediated by 3DPP compared with the traditional two-dimensional measurement of the total knee arthroplasty can improve the postoperative effect of total knee arthroplasty mediated by 3DPP can be better the correction of the alignment of the knee joint bone distribution to describe limb alignment parameters of the experimental group and the control group before and after operation.The best surgical osteotomy and prosthesis installation were selected to simulate the 3D finite element model of total knee arthroplasty.The data of ANSYS analysis were basically consistent with those obtained by previous researchers in mechanical experiments,and their rationality was confirmed.Guided by three dimensional preoperative planning based on virtual data extracted from knee arthroplasty,the accuracy of clinical operation(imaging and AKSS score)in the experimental group was significantly higher than that in the control group.Conclusion: Accurate location information is the guarantee of individuation,precision and microcreativity,and preoperative planning is an important step for the precision of operation.In the case of knee fracture,the essence of 3D preoperative planning is the process of studying the best virtual surgical plan for total knee arthroplasty.The experiment shows that the total knee arthroplasty with 3DPP is less error and more effective than the total knee arthroplasty without 3DPP. |
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