Related Experiment Video
Updated: Aug 5, 2026
05:57
A Teleoperated Robotic System-Assisted Percutaneous Transiliac-Transsacral Screw Fixation Technique
Published on: January 6, 2023
The greater sciatic notch-based transcolumnar magic screw trajectory in the acetabulum: An anatomical guide
Pelin İsmailoğlu1, Cengiz Kazdal, Emrehan Uysal
1Recep Tayyip Erdoğan Üniversitesi Tıp Fakültesi, Anatomi Anabilim Dalı, 53020 Rize, Türkiye. pelin.ismailoglu@erdogan.edu.tr.
Joint Diseases and Related Surgery
|August 2, 2026
Summary
The greater sciatic notch (GSN)-based transcolumnar "magic screw" corridor is anatomically feasible in most adult pelves. Quadrilateral plate thickness is the primary anatomical limitation for this acetabular screw trajectory.
Area of Science:
- Orthopedic surgery
- Anatomy
- Medical imaging
Background:
- Acetabular fractures require precise surgical fixation.
- The greater sciatic notch (GSN) offers a potential entry point for screw placement.
- Understanding the anatomical corridor is crucial for surgical success.
Purpose of the Study:
- To define the GSN-based transcolumnar "magic screw" corridor in the acetabulum.
- To assess its morphometric characteristics and anatomical feasibility.
- To evaluate the influence of quadrilateral plate (QP) morphology on feasibility.
Main Methods:
- 3D morphometric analysis of 90 adult pelvic CT scans.
- Virtual screw insertion along the GSN-based transcolumnar trajectory.
- Measurement of trajectory length, angulation, and QP thickness.
- Analysis of feasibility based on anatomical constraints, sex, and side.
Main Results:
- The GSN-based transcolumnar corridor was feasible in 94.44% of cases.
- Mean screw length was ~73.7 mm; mean entry segment length was ~23.2 mm.
- Quadrilateral plate thickness varied significantly, with males having thicker plates than females.
- QP thickness was the main limiting factor, especially in female pelves.
Conclusions:
- The GSN-based transcolumnar corridor is a viable intraosseous trajectory for acetabular fixation.
- Quadrilateral plate thickness is a critical anatomical consideration for feasibility.
- This corridor provides a quantifiable trajectory for reaching both acetabular columns.
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