Digital Simulation Study On Mechanical Stability Of Lumbar Internal Fixation Screw

The spine is an important tissue to maintain the stability of the human frame,and the lumbar spine plays a supporting role in the human body with the characteristics of heavy load.With the age,many kinds of osteodegenerative diseases probably appear in the human body.Pedicle screw fixation is the most common method in the treatment of lumbar degenerative diseases.All along,each version of the theory has its own advantages and disadvantages,so the academic circles have constantly put forward new theories.However,from the current research results,there is still a lack of systematic internal kernel analysis.The purpose of this paper is to combine the analysis methods of medicine and mechanics,introduce the digital simulation principle,and explore the relationship between the treatment effect of lumbar diseases caused by bone loss and the internal fixation method used,and then obtain more ideal effect.The main research contents and conclusions are as follows:Firstly,the simulation scheme is designed.Three kinds of internal fixation screw models were constructed,including traditional trajectories(TT)pedicle screw,cortical bone trajectories(CBT)pedicle screw and novel cortical bone trajectories(NCBT)pedicle screw.Then,the finite element model of L1-L5 whole vertebral body was established based on the extracted CT image samples of osteoporosis patients.The biomechanical properties of the three methods were analyzed and compared by finite element method.Secondly,the stress distribution and the maximum stress value of the bone around the nail path were measured and compared under the three states,and the differences were analyzed.The results showed that: under the same load condition,the stress performance of each group was significantly different,and the stress distribution of NCBT group was different from that of CBT group and TT group.Different schemes of screw path through different bone,bring different bone mineral density area,directly affect the mechanical properties of internal fixation screw in lumbar bone.Results the mechanism of the deficiency of each scheme in medical experiment was verified.Conclusion: Different angle of screw implantation will affect the distribution of internal stress and the maximum stress.The NCBT group has relatively good quality,and the biomechanical stability of screws is superior to the traditional CBT technology.NCBT screw technology is a preferred method in the selection of lumbar internal fixation scheme for patients with osteoporosis.In addition,different shapes and sizes of L1-L5 vertebral bodies lead to different mechanical properties and curative effects.According to different segments of lumbar vertebrae,different treatment schemes should be adopted.According to the stress of different lumbar States,lying position is the best way of rehabilitation.Finally,the influence of NCBT on nerve root and the optimized characteristics were summarized.In addition,combining the wisdom medical treatment of the Internet plus,the paper discusses the contribution of digital simulation of lumbar pedicle to scientific medical treatment and the application prospect of solving the problem of uneven distribution of medical resources.