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


January 2019, Volume 28, Issue 1, pp 138 - 145 Original Article Read Full Article 10.1007/s00586-018-5738-2

First Online: 24 August 2018

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 

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.[Figure not available: see fulltext.]


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