Fig. 1
From: Applicable safety analysis and biomechanical study of iliosacral triangular osteosynthesis
Establishment of 3D pelvic model and placement of S2AI screw (grey) and S2 sacroiliac screw (blue) in S2 segment. a. The inlet view of the pelvis. The projection of the S2AI screw on the horizontal plane is used to measure the lateral angulation(α). b. The lateral view of the pelvis. The projection of the S2AI screw on the sagittal plane is used to measure the caudal angulation(β). The W shown in the figure is the upper and lower width of the S2 safety channel