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Nevan G. Baldwin and Edward C. Benzel

which the supplemental security of sacral fixation is needed. References 1. Allen BL Jr , Ferguson RL : The Galveston technique for L rod instrumentation of the scoliotic spine. Spine 7 : 276 – 284 , 1982 Allen BL Jr, Ferguson RL: The Galveston technique for L rod instrumentation of the scoliotic spine. Spine 7: 276–284, 1982 2. Allen BL Jr , Ferguson RL : The Galveston technique of pelvic fixation with L-rod instrumentation of the spine. Spine 9 : 388 – 394 , 1984 Allen BL

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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