In this in vitro investigation, we compared the multidirectional flexibility properties of sacral alar iliac fixation with conventional methods of sacral and sacroiliac fixation using nondestructive and destructive investigative methods. The study demonstrated that S1–2 sacral fixation alone significantly increases sacroiliac motion under all loading modalities, while sacral alar iliac fixation reduced motion in axial rotation at the sacroiliac joint and offers potential advantages of a lower instrumentation profile and ease of assembly compared to conventional sacroiliac screw instrumentation.
Correspondence Bryan W. Cunningham: Musculoskeletal Education and Research Institute, MedStar Union Memorial Hospital, Baltimore, MD. email@example.com.
INCLUDE WHEN CITING Published online January 4, 2019; DOI: 10.3171/2018.8.SPINE18328.
Disclosures Dr. Cunningham reports receiving clinical or research support for the study from DePuy Synthes Spine, Inc. Dr. Sponseller reports receiving research support and royalties from DePuy Synthes Spine, Inc., and royalties from Globus Medical. Dr. Tortolani reports receiving royalties, payment for the sale of intellectual properties, and fellowship grant support from Globus Medical, Innovasis, and KM2, as well as a clinical research grant and royalties from Spineology; he is also a consultant for Innovasis.
Monetary grant research support and instrumentation were provided by DePuy Synthes Spine, Inc. Grant support was provided by Advanced Spinal Technology, LLC.
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