Research On 3D Modeling And Biomechanical Simulation Based On CT Image

OBJECTIVE: Because the hip bone is responsible for important physical performance in the human environment and its own model structure is complex,it has certain limitations in the diagnosis of pelvic joint replacement surgery.Therefore,based on CT images,this thesis establishes a preoperative optimized pelvic joint model,an accurate and rapid reconstruction method of biological bone solid model.At the same time,the mechanical properties of the hip bone in the human body were studied,and the preoperative optimized pelvic joint model was established to facilitate 3D printing and reduce the risk before surgery.METHODS: The study was performed on a patient with hip osteosarcoma.The patient’s preoperative pelvic CT image was used to display the human optical image model through the medical Mimics software.The original CT image-image processing-surface reconstruction-materialization was used.The design steps determine the patient’s hip bone injury and the repairable state,and the doctor can learn more about the size and extent of sarcoma erosion.Firstly,using the core medical Mimics software,the pelvic joint CT image is obtained from the optical image and the noise point,and the vector tomographic image is obtained,and the multi-layer image is manually separated and formed to form a 3D image structure.Then in the reverse engineering Geomagic Studio software,the model is finished to fit the surface,and the surfaced structure and the materialized structure are generated.In Geomagic Studio software,the surface of the skeleton model is smoothed and smoothed by the grid repair command,which meets the accuracy requirements of the model and meets the subsequent finite element analysis.The Anybody software was used to simulate human gait simulations,to calculate the forces,deformations,and other useful data characteristics of the bones,muscles,and joints in the model.Finally,the pelvic joint meshing was completed in the finite element analysis software Abaqus.The material assignment and finite element simulation analysis of the model were performed in Abaqus.The force state and force cloud map of the hip bone were obtained.Understand the specific stress of the bone and the size of the force,reducing the risk of surgical replacement.Results: At this point,the paper completed the data conversion from the original CT to the entity,completed the finite element analysis of the artificial bone model,and obtained the applicability analysis results of the bone model,which is convenient for the patient’s preparation for surgery.The above method gives a good methodological guidance in orthopedics,which greatly shortens the patient’s surgical preparation time and functional rehabilitation time.