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Low Dose BMP-2 and Pelvic Fixation in Adult Deformity Surgery Prokopis Annis , MD , William R. Spiker , MD , Brandon D. Lawarence , MD , Michael D. Daubs , MD , and Darrel S. Brodke University of Utah, Department of Orthopaedics Disclosures: P. Annis: None. W.R. Spiker: None. B.D. Lawarence: None. M.D. Daubs: 1; I; Synthes Spine. 4; I; Synthes Spine. D.S. Brodke: 1; I; Amedica, DePuy Synthes, Medtronic. 4; I; DePuy Synthes. 6; I; Amedica, Vertiflex. 4 2014 36 4 A3 A3 Copyright held by the

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screws. Failure-free survival rate was 92.5% at 1 year, 85.9% at 2 years, and 78.2% at 3 years. Failure was more common in patients with iliac bolts than those with S2AI screws (9 vs. 2; p=0.026). Four patients with iliac bolts developed nonunion at L5-S1. Placement of iliac bolts (OR 12.8, 95% CI [1.81, 191.42]), number of levels fused (1.6, [1.15, 2.40]), and age (0.9, [0.78, 0.97]) were significantly associated with failure. Reason for pelvic fixation, pelvic screw length, number of previous fusion operations, smoking, and use of BMP were not associated with

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an advantage in weaker bone or for patients in whom early loosening is a particular concern. Increased age is an independent risk factor for early screw loosening. Neurosurg Focus Neurosurgical Focus FOC 1092-0684 American Association of Neurological Surgeons 10.3171/2016.4.FOC-LSRSabstracts 2016.4.FOC-LSRSABSTRACTS Abstracts Paper #26. Outcomes and Complications of Sacral Alar-Iliac (S2AI) versus Traditional Iliac Pelvic Fixation Daniel Kang , MD 1 , Mahati Mokkarala , B.S. 2 , Jacob Buchowski