Screw parameters in pedicle screw device for anterior pelvic fractures

GUO Jian-hui; WANG Zhao-hui; HE Bo-yong; ZHAO Kuai-ping

doi:10.3969/j.issn.1009-4237.2017.10.010

Abstract：Objective To study the diameter,length and direction of screw for guiding the operation of per-cutaneous pedicle srew internal fixation device for anterior pelvic fractures. Methods Normal pelvic computed tomography scans of adult patients from Mar. 2014 to Jun. 2015 obtained in Chenzhou No. 1 People's Hospital were collected. There were 45 males and 45 females,with age of 28-68 (average,41) years. CT images were imported in-to Mimics 10. 0 for reconstruction,and the parameter of screw's length,diameter and direction were measured. Re-sults The length of screw in ilium was (144. 25 ± 5. 56)mm in male and(140. 57 ± 5. 97)mm in female. The di-ameter of screw was (13. 26 ± 1. 35) and (12. 16 ± 1. 00)mm in male and female,respectively. The angles of screw and human coronal was (51. 07 ± 4. 32)° in male and (48. 88 ± 4. 40)° in female. The angle of screw and human sagittal was (24. 71 ± 2. 54)° in male and (23. 64 ± 2. 20)° in female. According to the screw's angle contrast anal-ysis of left and right,there was no statistical difference(P>0. 05). For the screw's angle contrast analysis of man and female,the difference was of statistical significance(P<0. 05) . Compared with left,the length of right screw had no statistical difference(P>0. 05). Compared with female,the length of male had difference of statistical signif-icance( P<0. 05 ) . According to the diameter of screw contrast analysis of left and right, there was no statistical difference(P>0. 05). Compared with the female,the diameter of male had difference of statistical significance(P<0. 05). Conclusion In case of assuring right diameter,length and direction in operation,inserting screw in bony channel between anterior superior iliac spine and acetabulum roof to the posterior superior iliac spine is feasible and safe. It is worth promoting in clinic.