Measurement of the “Safe Zone” and the “Dangerous Zone” for the Screw Placement on the Quadrilateral Surface in the Treatment of Pelvic and Acetabular Fractures with Stoppa Approach by Computational 3D Technology

Figure 4

The “dangerous zone” for screw placement with the Stoppa approach. In the figure, region A represents the “dangerous zone” for screw placement when the acetabulum was amplified for 2.95 mm, which is also defined as the absolute “dangerous zone.” Region B represents the “dangerous zone” when the acetabulum was amplified for 6 mm. The part of region B outside region A is the relative “dangerous zone” and the region outside B is the absolute “safe zone.”