ArticleEuropean spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society2026
Identification of a saddle point (SP) for safe sacral segment channel planning via data analysis and rapid physical prototyping.
Article in European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
This study introduces a novel geometric marker, derived from CT image data analysis via grey theory and prototyping verification, to enhance the planning of sacroiliac joint screw placement, aiming at optimizing safety. A dataset comprising 107 adult cases with hip thin-slice CT scans in DICOM format was collected for statistical analysis. The sacral bone model was segmented from the scanning data sets to facilitate planning for sacroiliac screw surgery. The saddle point (SP), located at the intersection of the contralateral sacral promontory and the sacral wing, was identified as the target direction for needle insertion. The entry point on the anterior convexity and posterior concavity of the ear-shaped surface was connected to the posterior superior aspect to determine the retrograde positioning of the screw channel. Utilizing a home-made software, E3D, the safe channel was visualized using three cross-sectional views with the screw channel as the axis. Adjustment of the central screw channel's position in the transverse and coronal planes facilitated its establishment. The distances between the highest (up, u) and lowest (down, d) entry points on the ear-shaped surface (ud, mm), as well as the distances between the most anterior (ahead, a) and most posterior (back, b) points (ba, mm), were measured to approximate the area (surface, s, mm
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