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Biomechanics - S1 Screw Bending Moment With Posterior Spinal Instrumentation Across the Lumbosacral Junction After Unilateral Iliac Crest Harvest - This is a biomechanical study comparing the flexion/extension bending moment within the S1 screw with four long posterior constructs across the lumbosacral junction when only one ilium is available for instrumentation. A significant decrease in the bending moment was observed with the addition of an anterior L5-S1 strut except in the posterior constructs where distal fixation beyond S1 included an iliac bolt and contralateral S2 screw or bilateral S2 screws./
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