| Objective: To determine the safety screw channel around the quadrilateral plate between the anterior and posterior columns of the acetabulum,measure the position of the screw entry point and screw exit point of the safety screw channel,and analyze the anatomical parameters of each point,the relationship between each point and the length and direction of the screw,so as to provide data support for clinical operation.Methods: Complete pelvic CT tomography data of 60 normal adults in affiliated hospital of Jining Medical College were selected and imported into 3D image generation and editing software Mimics Medical20.0.Three-dimensional digital model of pelvis was established.The midpoint of the connection between the arch line and the front edge of the auricular front and the anterior inferior iliac spine was taken as a perpendicular line to the coronal plane and cross section,and the intersection point between the two perpendicular lines and the iliac wing plane was determined as the nail insertion point of two virtual screws.The direction of the virtual screw is taken as the connecting line between the intersection point of the perpendicular line of the cross section and the highest point of the ischial spine,the intersection point between the screw and the inner surface of the quadrilateral palte is taken as the nail outlet point,the distance between the nail inlet point and the nail outlet point is taken as the length of the virtual screw,and the diameter of the virtual screw is set to 3.5 mm.Measure the distance between the nail entry point and the anatomical landmark point,the length and direction of the virtual screw,and collect and statistically analyze the data.Results: The distance from the insertion point of the virtual screw 1to the intersection point of the arch line and the anterior edge of the auricular front is 32.65 ± 3.93 mm for men and 31.65 ± 3.96 mm for women,the distance to anterior inferior iliac spine was 44.82±3.45 mm for male and 43.67±3.80 mm for female.The distance from the insertion point of the virtual screw 2 to the intersection point of the arch line and the anterior edge of the auricular front is 44.21±3.25 mm for men and43.62±4.40 mm for women,the distance to anterior inferior iliac spine was 34.89 ± 2.94 mm for male and 33.99 ± 4.06 mm for female.The distance from the exit point of the virtual screw 1 to the intersection point of the arch line and the anterior edge of the auricular front is 43.49±7.98 mm for men and 37.70 ± 4.84 mm for women,the distance to anterior inferior iliac spine was 72.05±6.70 mm for male and 60.23±5.29 mm for female.The distance from the exit point of the virtual screw 2 to the intersection point of the arch line and the anterior edge of the auricular front is 63.15±8.78 mm for men and 55.83±8.73 mm for women,the distance to anterior inferior iliac spine was 80.89±7.79 mm for male and64.58±8.22 mm for female.The length of virtual screw 1 is 39.02±8.08 mm for male and 27.49±5.88 mm for female.The length of virtual screw2 was 54.37± 8.21 mm for male and 38.27± 9.62 mm for female.The angle between virtual screw and cross section was 40.07 ± 1.60° for male and 41.95±5.03° for female.The angle between virtual screw and coronal plane was 41.58±6.79° for male and 42.95±5.49° for female.The angle between virtual screw and sagittal plane was 21.82±5.59° for male and 16.34±5.11° for female.The difference in the distance between the exit point of the two virtual screws and the intersection of the arcuate line and the front edge of the ear and the anterior inferior iliac spine between men and women is statistically significant.The difference in the length of the two virtual screws between men and women is statistically significant.The difference in the angle between the virtual screw and the sagittal plane between men and women is statistically significant.Conclusion: Three-dimensional reconstruction using Mimics software is efficient and reliable in medical research,and the position of channel screws found in this study is safer.The distance from the exit point of the virtual screw to the anatomical landmark point and the length of the screw are statistically significant in different genders.The difference between genders should be considered in clinical operations. |
