Objective
To summarize the current research progress of second sacral alar-iliac (S2AI) screw technique for reconstruction of spinopelvic stability.
Methods
The recent original literature concerning development, clinical applications, anatomy, imageology, and biomechanics of S2AI screw technique in reconstruction of spinopelvic stability was reviewed and analyzed.
Results
As a common clinical strategy for the reconstruction of spinopelvic stability, S2AI screws achieve satisfactory effectiveness of lumbosacral fixation without complications which were found during the application of traditional iliac screws technique. S2AI screw technique is more difficult to place screws by hand because of its narrow screw trajectory. Although the S2AI screws trajectory pass through 3 layers of bone cortex, the biomechanical cadaveric study demonstrate that no statistical difference in stiffness was found between the traditional iliac and S2AI screw in a spinopelvic fixation model.
Conclusion
S2AI screw technique should be a safe and feasible method for reconstruction of spinopelvic stability in place of the traditional iliac screw technique.
