Radiological anatomical comparison of the implantation safety of S1AIS versus S2AIS for fixation of sacroiliac joint

doi:10.13418/j.issn.1001-165x.2025.3.04

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Chinese Journal of Clinical Anatomy ›› 2025, Vol. 43 ›› Issue (3) : 264-268. DOI: 10.13418/j.issn.1001-165x.2025.3.04

Radiological anatomical comparison of the implantation safety of S1AIS versus S2AIS for fixation of sacroiliac joint

Zhang Yang, Xie Qianyun , Tang Wen*, Yang Ying

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Abstract

Objective To compare the implantation safety of the first and second sacral alar-iliac screw (S1AIS, S2AIS) for fixation of sacroiliac joint through radiological anatomy. Methods CT data of 80 normal adult pelvic were selected, with 40 cases for each gender, aged (45.1±6.3) years old. By simulating the SAIS fixation method using CT digital reconstruction technology to measure the insertable range, nail path length and width of S1AIS and S2AIS on the 3D reconstruction of pelvic. Φ6.5 mm and Φ8.0 mm screws were implanted respectively on the left and right sides of 30 3D printed pelvic models. The implantation results were observed. Results The length and width of the nail path in S1AIS and S2AIS were similar (P>0.05), and there were no breaches of nail path in Φ6.5mm SAIS. However, the insertable range and the nail path length on the sacral side [(234.56±10.06) mm2, (40.97±2.81) mm] of S2AIS were smaller than those of S1AIS [(307.55±10.42) mm2, (42.16±3.06) mm, P<0.05], and the breach rate of the sacral posterior lateral cortex of Φ8.0 mm S2AIS (30%) was higher than that of Φ8.0 mm S1AIS (3%) (P<0.05). Conclusions S1AIS has a larger insertable range, fewer breaches of the sacral posterior lateral cortex and a longer nail path length on the sacral side compared to S2AIS, indicating that S1AIS has higher implantation safety than S2AIS in fixation of sacroiliac joint.

Key words

Sacral alar- iliac screw / / / Sacroiliac joint / / / Screw implantation / / / Radiological anatomy / Safety

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Zhang Yang, Xie Qianyun , Tang Wen, Yang Ying. Radiological anatomical comparison of the implantation safety of S1AIS versus S2AIS for fixation of sacroiliac joint[J]. Chinese Journal of Clinical Anatomy. 2025, 43(3): 264-268 https://doi.org/10.13418/j.issn.1001-165x.2025.3.04

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