How Does Spino-Pelvic Fixation Affect Post-Operative Compensatory Mechanisms in Adult Spinal Deformity?

Study Design: Retrospective single-center multi-surgeon cohort study.

Objectives: Compare the post-operative changes in the compensatory mechanisms of the sagittal balance according to the type of pelvic fixation: S2-Alar-iliac screws (S2AI) vs iliac screws (IS) in patients with Adult spine deformity (ASD).

Methods: ASD patients who underwent spino-pelvic fixation and remained with a PI-LL >10° mismatch post-operatively were included.

Can Pelvic Incidence Change After Lumbo-Pelvic Fixation for Adult Spine Deformity, and Would the Change be Affected by the Type of Pelvic Fixation?

Study Design: Retrospective review.

Objective: To assess the change in pelvic incidence (PI) after lumbo-pelvic fixation and the differential impact of the type of pelvic fixation: S2-alar-iliac screws (S2AI) versus Iliac screws (IS) on postoperative PI.

Summary Of Background Data: Recent studies suggest that changes occur to the previously assumed fixed PI after spino-pelvic fixation.