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Clinical Case Studies - Minimum 2-Year Analysis of Sacropelvic Fixation and L5-S1 Fusion Using S1 and Iliac Screws - Bilateral iliac screws coupled with bilateral S1 screws provide excellent distal fixation for L5-S1 fusions (in patients with spinal deformity) with a high primary (97.1%) and revision (83.3%) fusion rate. Previous iliac crest harvesting does not necessarily prevent ipsilateral iliac screw placement (34 of 36 graft sites) or additional iliac harvesting (78 of 80 patients)./
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