Coronal Deformity Angular Ratio May Serve as A Valuable Parameter to Predict In-brace Correction in Patients with Adolescent Idiopathic Scoliosis

Publication date: Available online 7 December 2018

Source: The Spine Journal

Author(s): Chuandong Lang, Qihua Zou, Wenyuan Sui, Yaolong Deng, Zifang Huang, Junlin Yang

Abstract

Background Context

In-brace correction (IBC) plays an important role in curve progression of patients with adolescent idiopathic scoliosis (AIS) under brace treatment. We evaluated the coronal deformity angular ratio (C-DAR) as a potential predictor of IBC. Based on our experience, we postulated that a high C-DAR may result in low IBC. This relationship had not been previously studied.

Purpose

To evaluate the relationship of C-DAR and IBC in patients with AIS.

Study Design/Setting

A retrospective study.

Patient Sample

A total of 119 patients with AIS treated with a Gensingen brace in our scoliosis center from July 2015 to October 2017 were included.

Outcome Measures

In-brace correction.

Methods

Data were collected before and upon brace placement. Correlation analyses between study variables and IBC were performed. A linear regression model was established on the basis of C-DAR.

Results

At brace fitting, the average age was 12.62±1.16 (range, 10–15) years and mean major curve Cobb angle was 32.14±4.66° (range, 25–40°). Mean IBC was 59.62%±22.03% (range, 16.2%–100%). IBC had significant correlation with C-DAR (r = -0.69; 95% confidence interval, -0.77– -0.61; P < 0.001). IBC was not significantly correlated with age, sex, height, weight, BMI, menstrual status or Risser sign. A simple linear regression model established that In-brace correction = 115.4−10.7 × C-DAR.

Conclusions

C-DAR has strong negative correlation with IBC and may estimate the expected IBC. The usage of C-DAR may obviate the need for flexibility radiographs, such as supine or supine lateral bending radiographs.

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