Related Experiment Video
Updated: Aug 6, 2026
Treatment with Locking Intramedullary Nailing for Intertrochanteric Fracture of the Femur Utilizing a New Awl with a Distal Positioner
Published on: June 6, 2025
The Central Entry Point for Infra-Acetabular Screw Placement: Defining an Anatomical Entry Zone and Evaluating Its
Jiaqiang Chen1, Yongsheng Wang1, Peishuai Zhao1
1Department of Orthopaedics, The First Affiliated Hospital of Bengbu Medical College, Bengbu, China.
Objective:
Previous studies have been constrained by a single ideal entry point and a narrow bony corridor, leaving a limited selection of entry points for infra-acetabular screws and resulting in suboptimal surgical efficiency. This study aims to analyze the morphology of the infra-acetabular screw entry zone and evaluate a central entry point zone for optimizing surgical screw placement.
Methods:
3D pelvic models from 100 patients were reconstructed. The entry zone was morphologically analyzed, and its similarity to a standard ellipse was calculated. A clinical comparison was conducted on 20 patients with acetabular fractures, comparing the central entry point technique against the ideal entry point method.
Results:
The entry zone exhibited a quasi-elliptical shape. The central entry point was consistently located medial and anterior to the ideal entry point. Clinically, the central entry point group demonstrated significantly shorter operative time and fewer x-ray exposures, while screw length and success rate showed no significant difference.
Conclusion:
The infra-acetabular screw entry zone is an elliptical structure. Using the central entry point significantly improves placement efficiency and reduces radiation exposure, offering considerable clinical value.
