| Objective By reconstruction the full cervical MSCT data for 2D united 3D digital measurement in children aged 06 years,to explore the characteristics of age related parameters of C3 to C7 pedicle and the law of changing,to provide the anatomical basis for clinical diagnosis and treatment of related diseases,internal fixation mode selection,auxiliary orthopaedic equipment designing and manufacturing and so on,at the same time for providing basic data in studying of pediatric cervical age change characteristics.Methods Collecting cervical MSCT thin layer scanning image data of 52 cases of pediatric specimen（from February 2014 to October 2018）from three hospitals,and16 cases of child-pediatric specimen from Inner Mongolia medical university.Using Mimics to measure morphological indicators:pedicle width and the height,length,lateral mass-pedicle length,pedicle axis length,anteroposterior cervical spinal canal diameter,interpediculate distance,transcerse pedicle angle and sagittal pedicle angle,and vertebral pedicle axis in the middle of sagittal alignment;to analyze the pedicle width/height,interpediculate distance/anteroposterior cervical spinal canal diameter,pedicle axis length pedicle axis length,pedicle and lateral mass proportion relation;to make statistical analysis according to side sex and age.Consequence 1.The width,height and length of the C3-C7 pedicle,lateral mass-pedicle length,pedicle axis length and the interpediculate distance of children aged 0-6 years showed an overall increasing trend with the increase of age,but the range of the anteroposterior cervical spinal canal diameter was different.The anteroposterior cervical spinal canal diameter showed an overall increasing trend with the increase of vertebral sequence,and there was no statistically significant difference among age groups（P>0.05）.2.Overall,the transverse pedicle angle is in decreasing trend along with the age and job sequence,the maximum is 47.44°,the minimum is38.95°,the sagittal pedicle angle in every age group are from the positive to the negative gradient,the absolute value of negative increase gradually;The same vertebral body index of the angle has no obvious change with age.3.The pedicle width/height ratio decreased gradually,interpediculate distance/anteroposterior cervical spinal canal diameter of the cervical spinal canal increased gradually.4.With the increase of age,the proportion of the three parts of the total length of the pedicle changes,among which the proportion of the lateral mass increases continuously while the vertebral body decreases continuously,and the proportion of the pedicle does not change significantly.5.Category I accounted for 28%,Category II for 31%,and Category III for up to 41%in the relationship of position.Conclusion 1.The 2D and 3D digital measurement of C3-C7 vertebral pedicle in children aged from 0 to 6 years is a better way to obtain accurate data in living children.2.PW,PH and other indicators should be accurately measured before pedicle screw placement in children aged 0-6 years to determine whether they have the conditions for screw placement and assist in the selection of the optimal screw size.In this study,it was considered that children in this age group with C3-C7 pedicle could theoretically use a 3.0mm diameter screw.3.According to the PAL measurement average of each group,the recommended screw depth was 16.5mm in group A,17.8mm in group B and 19.0mm in group C.4.The interpediculate distance increases faster than the anteroposterior cervical spinal canal diameter of the cervical-spinal canal,and the increase of the lateral mass provides the main support for the increase of the total length of the pedicle.5.In children aged 0-6 years,41%of vertebral bodies need bilateral puncture to improve the bilateral balance of bone cement injected into the vertebral body,and 28%of vertebral bodies need to adjust the angle of vertebral level on both sides during the pedicle screw implantation to avoid"convergence and collision"in the vertebral body. |
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