Finite Element Analysis Simulation Import Artificial Cervical Intervertebral Disc Replacement Endplate Stress Changes Research

Objective: As early as in twenty years ago China will carry out artificial cervicalintervertebral disc replacement, the twenty years total disc replacement technologymatures, domestic application of artificial cervical intervertebral is Europe and theUnited States imports, constantly prosthesis updated, have not for Chinese peopleartificial disc prosthesis, around vertebral body size, small diameter is larger, and afterthe clinical choice between artificial disc prosthesis, appear when transverse diameterfor the sagittal diameter is too small, when sagittal diameter for the transverse diametertoo wide and the contradiction between the experiment to verify the finite elementmethod in the study of the feasibility of the prosthesis for people, through theestablishment of cervical artificial disc replacement between the three dimensional finiteelement model, the model of biological mechanics calculation, According to conditionsof the artificial disc prosthesis the same height,the same diameter, and different ofsagittal diameter establish two finite element models.analysis between artificial discreplacement after the lower vertebral lamina and the next phase difference betweenplate stress.Methods: Choosing a patient of cervical intervertebral disc herniation，adultmale,43years old， height175cm，weight75kg，X-ray and CT slice not seendegeneration.Using the helix scan from top to down. scanning conditions:Layerthickness was1mm,layer distance of0.4mm,512x512pixel，scanning range includedC1-C7.119pictures were obtained.Datas were saved in CD. Application Mimics10.1,Geomagic Studio11, ABAQUS software; The CT raw data to DICOM file format inputMimics10.1software preliminary modeling, select the data modeling, the3D modeldata to STL format into Geomagic Studio and regional division, optimize the grid, in ABAQUS software, Through the three-dimensional imaging measurement know needreplacement of prosthesis transverse diameter14mm, sagittal diameter16mm, height6mm; Existing prosthesis (16mm/18mm/6mm) and (14mm/16mm/6mm) two optionalmodel, in order to avoid iatrogenic oppression, we choose (14mm/16mm/6mm)prosthesis model1, patients sagittal diameter for and mm, will sagittal diameter spin2mm model2. Different material was assigned different mechanical parameter,boundary, load,The two cervical model applied vertical concentrated stress, analyzes itsin vertical load, the adjacent intervertebral disc and endplate stress difference. Under the50N preload the model to simulate the weight of the head is loaded the2.0N moment tosimulate surgery stress changeResults: To the simulation operation finite element mechanics analysis, set upmodel1(14mm/16mm/6mm) prosthesis and transverse diameter, height the same butsagittal diameter extension2mm model2. Sagittal diameter of finite element is largerthan model1,The end plate of C6Von Mises stress is obvious decreased,The end plateof C6Von Mises stress decreased is obvious too; a finite element model wasdecreased and1; The end plate of C6Von Mises stress decreased is more obvious, C6vertebral body and C6/7Von Mises stress also fell slightly, but more smaller declinesthan end plate stress;model2Von Mises curve of X/Y coordinate chart is lower thanmodel1. End plate peripheral area is under load and transmission force of the main partof the disk and small diameter increased to a job board under the stress. Leading to anincreased risk of sinking prosthesis, which reduces the false body use fixed number ofyear, also influence the patient after the prognosis.Conclusion:1: In the condition of artificial disc prosthesis the same height,the samediameter, the sagittal diameter extended appropriately can reduce stress of upper andlower end plate.2: Three-dimensional finite element method is an effective,economic andapplicabl biomechanics research methods; is the study of suitable for China’s populationbetween cervical artificial disc is an effective tool, but still has many deficiencies.3: Total disc replacement between to reduce near stage degeneration, but thechoice of artificial disc size directly affects the operation effect. Sagittal diameter offinite element is larger than model1,The end plate of C6Von Mises stress is obviousdecreased,The end plate of C6Von Mises stress decreased is obvious too; a finiteelement model was decreased.Using the finite element analysis method, we can make the full understanding of the human body of the cervical spine biomechanics.