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European Spine Journal

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01-01-2019 | Original Article

Long fusion to the pelvis with S2-alar-iliac screws can induce changes in pelvic incidence in adult spinal deformity patients: analysis of predictive factors in a retrospective cohort

Authors: ChangChun Tseng, Zhen Liu, HongDa Bao, Jie Li, ZhiHui Zhao, ZongShang Hu, Yong Qiu, ZeZhang Zhu

Published in: European Spine Journal | Issue 1/2019

Abstract

Purpose

To verify whether pelvic incidence (PI) would change in adult spinal deformity (ASD) patients who underwent long instrumentation using S2-alar-iliac (S2AI) screws and to identify factors associated with the change in PI.

Methods

We retrospectively reviewed all patients who underwent spinal surgery using S2AI screws between November 2014 and January 2017 at our institution. Patients aged 20 years or above with available radiographs were included. According to the change in PI, patients were divided into two groups, group C: PI variance reached 5 or more degrees postoperatively and group NC: PI changed less than 5°.

Results

A total of 47 patients (3 males, 44 females; mean age, 52.47 ± 15.80 years) were included in this study. PI significantly decreased from 51.25° ± 14.80° to 40.43° ± 14.23° in group C (n = 26), with a mean change in 11.52° ± 6.17° (P < 0.05), but changed from 47.00° ± 13.18° to 46.57° ± 13.71° in group NC without statistical significance. Intergroup analysis showed that change in PI, preoperative PI–LL, preoperative LL, preoperative SVA, and postoperative PT were significantly different between both groups. Correlation analysis showed that the change in PI and preoperative LL and PI were significantly associated. The formula provided by the regression analysis was ΔPI = − 3.108 − 0.11PreLL + 0.211PrePI.

Conclusions

Our study showed that PI decreased in 55% of ASD patients after spinal surgery using S2AI screws. Greater preoperative PI–LL mismatch and PI, as well as lumbar kyphosis, were associated with postoperative change in PI.

Graphical abstract

These slides can be retrieved under Electronic Supplementary Material.

Available only for authorised users

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Title: Long fusion to the pelvis with S2-alar-iliac screws can induce changes in pelvic incidence in adult spinal deformity patients: analysis of predictive factors in a retrospective cohort
Authors: ChangChun Tseng
Zhen Liu
HongDa Bao
Jie Li
ZhiHui Zhao
ZongShang Hu
Yong Qiu
ZeZhang Zhu
Publication date: 01-01-2019
Publisher: Springer Berlin Heidelberg
Published in: European Spine Journal / Issue 1/2019
Print ISSN: 0940-6719
Electronic ISSN: 1432-0932
DOI: https://doi.org/10.1007/s00586-018-5738-2

At a glance: The STEP trials

Springer Medicine

Long fusion to the pelvis with S2-alar-iliac screws can induce changes in pelvic incidence in adult spinal deformity patients: analysis of predictive factors in a retrospective cohort

Abstract

Purpose

Methods

Results

Conclusions

Graphical abstract

At a glance: The STEP trials

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusions

Graphical abstract

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