Three-dimensional digital anatomical measurement of modified sacroiliac screws

Tingguang Wang; Bei Zhao; Jun Yan; Jia Wang; Chong Chen; Weidong Mu

doi:10.1186/s13018-022-03018-3

Three-dimensional digital anatomical measurement of modified sacroiliac screws

J Orthop Surg Res. 2022 Mar 4;17(1):136. doi: 10.1186/s13018-022-03018-3.

Authors

Tingguang Wang^{1

2}, Bei Zhao³, Jun Yan³, Jia Wang², Chong Chen², Weidong Mu⁴

Affiliations

¹ Department of Traumatic Orthopaedics, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, 324 Jing Wu Road, Jinan, 250012, Shandong, China.
² Department of Orthopaedics, People's Hospital of Zouping City, Binzhou, Shandong, China.
³ Department of Orthopaedics, Liaocheng People's Hospital, Liaocheng, Shandong, China.
⁴ Department of Traumatic Orthopaedics, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, 324 Jing Wu Road, Jinan, 250012, Shandong, China. Dr_muweidong@163.com.

Abstract

Purpose: To rebuild a model of the pelvis and effectively simulate the trajectory of modified sacroiliac screws, we measured the parameters of each screw and screw channel and assessed the safety and feasibility of the parameters in adults.

Method and materials: One hundred (50 males and 50 females) normal adult pelvic computed tomography (CT) images were randomly selected and imported into Mimics software to rebuild the three-dimensional pelvis model. In these models, each ideal channel of modified screws was simulated, and then we obtained the precise parameters of screws and channels using Mimics and Three-matic software.

Results: The results of the comparison (right vs. left) showed that there were no significant differences in any of the angles, radius or M1SI parameters (the first modified sacroiliac). However, one parameter (BS) of M2SI (the second modified sacroiliac), two parameters (AP and BS) of M3SI (the third modified sacroiliac), and three parameters (AP, BS, L) of M4SI (the fourth modified sacroiliac) were statistically significant (P < 0.05). The result of comparison (between genders) showed that there were no significant differences in M1SI and M2SI; in contrast, the radius, length and the α angle of M3SI and M4SI were significantly different between genders (P < 0.05), and the radius of M4SI required special attention. If the radius of the limiting screw channel was > 3.50 mm, 52 cases (52%, 24 males and 28 females) could not complete the M4SI screw placement among 100 samples. If the radius of the limiting screw channel was > 3.0 mm, a total of 10 cases (10%, 2 males and 8 females) could not complete the M4SI screw placement.

Conclusion: Through the measurement of 100 healthy adult real three-dimensional pelvic models, we obtained the parameters of each modified sacroiliac screw and measured the three angles of each screw based on international coordinates for the first time, which can instruct clinical application.

Keywords: Modified sacral-iliac screw; Reconstruction; Screw parameters; Three-dimensional.

MeSH terms

Bone Screws*
Female
Fracture Fixation, Internal / methods
Humans
Image Processing, Computer-Assisted
Imaging, Three-Dimensional / methods*
Male
Pelvis / surgery*
Sacrum / diagnostic imaging*
Sacrum / surgery

Abstract

MeSH terms

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