Nanwei Zhang1, Binsheng Yu2. 1. Shantou University Medical College, Shantou Guangdong, 515041, P.R.China;Department of Spine Surgery, Peking University Shenzhen Hospital, Shenzhen Guangdong, 518036, P.R.China. 2. Department of Spine Surgery, Peking University Shenzhen Hospital, Shenzhen Guangdong, 518036, P.R.China;Shenzhen Key Laboratory of Spine Surgery, Orthopaedic Research Center, Peking University Shenzhen Hospital, Shenzhen Guangdong, 518036, P.R.China.hpyubinsheng@hotmail.com.
Abstract
Objective: To summarize the current research progress of second sacral alar-iliac (S 2AI) screw technique for reconstruction of spinopelvic stability. Methods: The recent original literature concerning development, clinical applications, anatomy, imageology, and biomechanics of S 2AI screw technique in reconstruction of spinopelvic stability was reviewed and analyzed. Results: As a common clinical strategy for the reconstruction of spinopelvic stability, S 2AI screws achieve satisfactory effectiveness of lumbosacral fixation without complications which were found during the application of traditional iliac screws technique. S 2AI screw technique is more difficult to place screws by hand because of its narrow screw trajectory. Although the S 2AI 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 S 2AI screw in a spinopelvic fixation model. Conclusion: S 2AI screw technique should be a safe and feasible method for reconstruction of spinopelvic stability in place of the traditional iliac screw technique.
Objective: To summarize the current research progress of second sacral alar-iliac (S 2AI) screw technique for reconstruction of spinopelvic stability. Methods: The recent original literature concerning development, clinical applications, anatomy, imageology, and biomechanics of S 2AI screw technique in reconstruction of spinopelvic stability was reviewed and analyzed. Results: As a common clinical strategy for the reconstruction of spinopelvic stability, S 2AI screws achieve satisfactory effectiveness of lumbosacral fixation without complications which were found during the application of traditional iliac screws technique. S 2AI screw technique is more difficult to place screws by hand because of its narrow screw trajectory. Although the S 2AI 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 S 2AI screw in a spinopelvic fixation model. Conclusion: S 2AI screw technique should be a safe and feasible method for reconstruction of spinopelvic stability in place of the traditional iliac screw technique.
Keywords:
Second sacral alar-iliac screw; iliac screw; internal fixation; reconstruction of spinopelvic stability