Digital Research On The Morphological Development Of Children’s Sternum And Its Applications

Objective:1.Observing the morphological development of the sternum in children aged 0-12 through MSCT three-dimensional reconstruction,exploring the variation types of various parts of the sternum in children,the ossification process and their relationship with gender and age,and providing a theoretical basis for the clinical diagnosis and treatment of sternum-related diseases in children;2.Establish the sternum gender determination equation for children aged 0-12,and provide a theoretical basis for determining the gender determination of children’s unknown bones.Methods:The chest MSCT data of 390 children aged 0-12 years old in the Imaging Center of the Affiliated Hospital of Inner Mongolia Medical University were retrospectively studied.One year old was divided into 13 groups.(1)Mimics software reconstructs the sternum,and observes the variation types such as sternal manubrium,suprasternal bone,suprasternal tubercle,sternal protrusion,sternal cleft,sternal foramen,xiphoid process absence,double xiphoid process,and xiphoid foramen;(2)Sternum Fusion between multiple ossification centers of the handle,fusion between sternal body ossification centers,sternal body ossification pattern,xiphoid process ossification and other ossification conditions,as well as xiphoid process type and xiphoid process deviation.(3)The Chi-square test was used to analyze the relationship between each variation type and ossification status and gender and age,and the Spearman rank correlation coefficient was used to analyze the correlation between each variation type and ossification status and age.(4)Perform reconstruction measurements on each part of the sternum,including the full length of the sternum,the length of the manubrium,the length of the body,the maximum and minimum width of the sternum,the maximum width and thickness of the body,the maximum and minimum thickness of the sternum,and calculate the corresponding manubrium index,sternum body index,Sternal index;(5)After the paired t-test was used to obtain statistically significant indicators,the function discriminant was established by Fisher’s discriminant analysis.The first 90% of the data was used to establish the equation,and the last 10% was used to verify its validity.Results:All 390 tested children could show the complete sternum.1.Found variant types such as suprasternal tubercle,sternal protrusion,sternal cleft,sternal foramen,xiphoid process absence,and specific xiphoid process,among which the sternal cleft and sternal foramen had statistically significant differences between genders;2.The sternal manubrium and sternal foramen The fusion between sternal body ossification centers and xiphoid process ossification have statistically significant differences among different ages(P<0.05).The former is significantly negatively correlated with age,while the latter two are significantly positively correlated with age;3.Xiphoid process There were statistically significant differences in typing among different ages(P<0.05);there were statistically significant differences in xiphoid-process deviation between genders and ages(P<0.05),and there was a significant negative correlation with age.4.Through the t test analysis,it is found that the total length of the sternum,the length of the sternum,the maximum width of the peduncle and the body,the maximum thickness,the index of the manubrium,the index of the body of the sternum,and the index of the sternum have statistically significant differences between sexes,and successfully established13 discrimination items Equation,training set,validation set accuracy rate were 49.9% ～63.7% and 49.8% ～ 59.7%.Conclusions:1.There are many types of sternal variation in children aged 0-12,and the combination of multi-slice spiral CT multi-planar reconstruction,maximum density projection,volume imaging technology,and coronal view is the current observation method with better effect and clearer resolution;2.0-A variety of variant types appeared in 12-year-old children,among which,the frequency of sternal foramen,sternal cleft,and xiphoid process deviation(left deviation)was significantly higher in boys than in girls;3.The number of ossification centers of the manubrium and more than 2 bone The position of the second ossification center and the main ossification center in the midline,the number of ossification center segments of the sternal body and the number of ossification centers,the fusion mode and situation of the ossification center of the sternal body,and the ossification of the xiphoid process were different in different age groups.Obvious aging characteristics;4.Two new xiphoid-process types appeared in children aged 0-12,which provided a theoretical basis for clinical differentiation and diagnosis;5.Through multi-slice spiral CT images of children aged 0-12 13 sternal gender discrimination equations suitable for children aged 0-12 were established using adult indicators and methods;6.It was confirmed that the accuracy of the function equation established by combining multi-indicator data was higher than that of a single indicator;7.This study is a domestic Provide a theoretical basis for the related research and application of forensic identification of children’s living bodies and corpses.