Objective To construct a 3D model of the pelvis, simulate the process of suprapubic screw placement, and determine the parameters of the largest channel for retrograde suprapubic screw placement. Methods Pelvic CT scan data of 50 adults were collected from the Imaging Center of Pingxiang People's Hospital from December 2020 to December 2022. This data was imported into Mimics 20.0 software to reconstruct the 3D pelvic model and simulate screw placement. The placement process was as follows: (1) The axis of the suprapubic screw channel was determined, a small-diameter virtual cylinder was inserted; (2) The diameter of the virtual cylinder was increased until it didn't break through the pubic body, suprapubic ramus and acetabulum, considering it as the largest screw channel; (3) The length and diameter of the largest screw channel, the angle of the screw axis with the sagittal and transverse planes were measured. Results The ranges of the largest channel length were: male right (107.26±7.58) mm, male left (106.96±11.01) mm, female right (102.34±8.30) mm, female left (103.30±10.05) mm; the range of largest channel diameter were: male right (8.10±0.61) mm, male left (8.05±0.66) mm, female right (6.57±0.77) mm, female left (6.48±0.61) mm. There was no significant difference in the maximum length of the screw channel and the included angle with the cross section between male and female and between the left and right sides (P>0.05). There was no significant difference in the maximum diameter between the left and right sides (P>0.05), but the difference between male and female was statistically significant (P<0.001). Conclusions The average diameter and length of male in maximum screw channel are 8.07 mm and 107.11 mm, respectively. The average diameter and length of female are 6.50 mm 102.82 mm, respectively. This study can provide anatomical reference for percutaneous retrograde suprapubic branch screw fixation and help clinicians choose suitable surgical screws.
Key words
Superior pubic ramus fracture /
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Retrograde superior pubic ramus screw /
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Digital anatomy
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