| Purpose:system collected 13 to 17 year olds thoracic CT image scanning data,and thoracic three-dimensional reconstruction,each joint of thoracic rib joint and vertebral joints shape measurement,statistical analysis,to explore 13 to 17 year olds thoracic joints,joint morphology development trend and the change rule and characteristics of appeared along with the age growth,thoracic articular process related diagnosis and treatment for the young people development morphology basis.CT imaging scans collected data to choose a research object,using Mimics 16.0 software,Geomagic Studio 12 14.0 reverse engineering software,ANSYS,a three-dimensional model of reconstruction of the thoracic 500 N pressure load on the surface of the thoracic vertebral body and 10 N · m torque and used to simulate the thoracic proneness,stretch,lateral flexion after three physiological state,13～17 year olds thoracic mechanics to study distribution laws and internal fixation instrument mechanics change rule.Materials and methods:in January 2015-May 2017,more than the central and western regions of Inner Mongolia tertiary hospitals in image,collect the imaging data of teenage thoracic CT examination,A total of 55 cases,will obtain the DICOM format data import original image 3 D reconstruction Mimics 16.0 software,3 D reconstruction of vertebral body model and measurement,measurement indicators include the following structure:articular process joint surface is high,the joint joint width,joints,joint spacing and joint joint plane and sagittal plane Angle,joints,joint surface and coronal Angle,rib vertebral joints,pedicle is the smallest diameter A and B),nail length that rib vertebral joints,pedicle rear bone cortex to fanterior edge C(D)and the distance of the bone cortex,rib vertebral joints,pedicle and the Angle between the spine Angle(e);Statistical analysis was performed according to age and thoracic segments,and the morphological development pattern was found.Results:there was a significant increase in the height of the joint surface,the width of the joint,the distance between the joints,the Angle between the joint surface and the sagittal plane,and the Angle between the joint surface and the coronal plane.The total joint surface height increased with the increase of vertebral order,and T12 reached the maximum.The total joint surface width increased with the increase of the vertebral order,and the T6 reached the minimum.The distance between the right and left articular surface was decreased with the increase of vertebral order,and the T5 reached the minimum.The Angle of articular surface and sagittal plane was decreased with the increase of vertebral order,and there was no statistical difference between different age groups,and T3 reached the maximum.Joint plane and coronal Angle with the increase of the vertebral body order showed a trend of decline after rising first,T7 has,T8 reaches the maximum,almost a "rush" distribution,conform to the facet joints joint surface "nearly coronary position".Thus,the trend can be seen:the direction of the joint surface is close to the coronal plane of the vertebral body,and it gradually ADAPTS to the "near sagittal position" of the joint of the lumbar joint,where T7 is the excessive middle segment.Rib thoracic vertebral joints,pedicle is the smallest diameter A and B),nail length that rib vertebral joints,pedicle rear bone cortex to fanterior edge C(D)and the distance of the bone cortex,rib between vertebral joints,pedicle and spine Angle(e)the measurement data are significant growth increases with age.The minimum transverse diameter of the intercostal joint was increased with the increase of the vertebral order in the first place,followed by the"V" type and T4 to the minimum.The minimum transverse diameter B of vertebral pedicle increases with the increase in the total number of vertebral order,which is the "square root" type,T4 reaches the minimum value.C with the increase of vertebral order in the vertebral arthroplasty of the vertebral cortex to the anterior margin of the vertebral body.The distance D of the posterior margin of the vertebral cortex to the anterior margin of the vertebral body was increased with the increase of vertebral order.The Angle between the intercostal joint and the spinous process(e Angle)decreased with the increase of vertebral order.The Angle between pedicle and spinous process(e Angle)decreased with the increase of vertebral order,and T12 was negative.F rib vertebral joint Angle of the steady trend overall,approximate "wave model",the maximum and the minimum difference within 0.01 °-2 °.Simulating thoracic rib vertebral joint unit orthopaedic fixation surgery,after in forward bends,with a state,the location of the maximum stress is screw tail,and screw stress size as follows:power is greater than the middle and lower;The central stress in the connecting rod is zero,and the lower end stress of the connecting rod is greater than the middle part;In the state of lateral bending,the tail stress of the upper screw is similar to the tail stress of the median screw,and the upper,middle and lower end stresses of the single side connecting rod are basically the same.In forward bends,after stretching,lateral movement condition,compare the stress variation in the same parts,can be found:lateral movement state,the central connecting rod stress increase,but in three kinds of motion state,under a screw tail stress is basically the same.Conclusion:1,the use of 3 d reconstruction images Mimics 16.0 software to create thoracic model,make the structure of the thoracic three-dimensional measurement visualizations,three-dimensional,facilitation,relative to the artificial bone measurement,ultrasonic and X-ray measurement such as 2 d plane measurement method is more accurate.2.The direction of the joint surface is continuously approaching the coronal plane of the vertebral body,and gradually ADAPTS to the"sagittal position" of the lumbar articular joint,in which T7 is the excessive middle segment.This study thoracic joints,joint surface is high,the joint surface width,joint spacing,joint surface and sagittal Angle,joint surface and coronal Angle measurement increases with age and significant growth,significant differences in the age of the group of low age groups.3,thoracic rib thoracic vertebral joints,and the smallest diameter of pedicle A and B),nail,vertebral joints,pedicle trailing edge length of the rib bone cortex to fanterior edge C(D)and the distance of the bone cortex,rib between vertebral joints,pedicle and spine Angle(e)the measurement data from adults close,increases with age and significant growth,significant differences in the age of the group of low age groups.4,the three-dimensional reconstruction of thoracic model,through the Geomagic Studio 12 14.0 reverse engineering software,ANSYS finite element analysis,can be more intuitive analysis of the stress of the orthopedic fixation system change rule,and through the finite element analysis,has obtained can be found in thoracic intervertebral bone graft into the road,after the rib vertebral joint unit of orthopaedic fixation surgery,3 kinds of sports(forward bends,after stretching,lateral movement),because the stress is greater than the upper screw tail part,so the upper screw tail are more likely to happen fatigue fracture;In the same way,the lower end of the connecting rod is more prone to fatigue fracture in the lateral bending motion of the connecting rod in the forward bend and back extension motion. |
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