Coronal deformity angular ratio as a predictive factor for in-brace curve correction and long-term outcome of brace treatment in adolescents with idiopathic scoliosis

Every year, the Italian Scoliosis Study Group selects the best published papers on conservative spine treatment from the global scientific literature.
Here is the abstract from one of these papers. 

Coronal deformity angular ratio as a predictive factor for in-brace curve correction

and long-term outcome of brace treatment in adolescents with idiopathic scoliosis

Taher Babaee, Mojtaba Kamyab, Mohammad Saleh Ganjavian, Naeimeh Rouhani, Adel Khorramrouz , James G Jarvis 

Spine Deform. 2022 Jan 16. PMID: 35034344 DOI: 10.1007/s43390-021-00452-x

Abstract

Purpose: To investigate the relationship between coronal deformity angular ratio (C-DAR) and in-brace correction (IBC) and their role in predicting the long-term bracing outcome in adolescents with idiopathic scoliosis (AIS).

Methods: In this retrospective multicenter study, the patient’s sex, age, primary curve Cobb angle (at initiation of brace treatment, best in-brace, before spinal fusion, and final follow-up), curve pattern, duration of brace treatment, brace type, and C-DAR at initiation of bracing were recorded. The C-DAR values were classified as < 5, 5 ≤ to ≤ 6, and > 6. The IBC values were classified as ≥ 50%, 40% ≤ to ≤ 49%, and < 40%. We classified the patients into two groups of success and failure according to the Cobb angle at the final follow-up.

Results: A total of 164 patients (25 boys and 119 girls) were included. Bracing was successful in 60.4% of them. There was a significant association between C-DAR and bracing outcome (p < 0.0001). 63.9% of the patients with C-DAR < 5 had an IBC ≥ 50%. However, when C-DAR was 5 ≤ to ≤ 6 and > 6, 29.2% and 16.9% of the patients had an IBC of ≥ 50%, respectively. For patients with IBC ≥ 50%, the success rate of bracing was 89.2%. Results of logistic regression analysis revealed that the strongest predictor for brace treatment outcome was the C-DAR, with an odds ratio of 2.11.

Conclusion: C-DAR may be used as a predictive factor for the long-term outcome of brace treatment in AIS.

Level of evidence: IV.

Keywords: Adolescent idiopathic scoliosis; Brace; Coronal deformity angular ratio; In-brace correction; Predictive factor.

https://pubmed.ncbi.nlm.nih.gov/35034344/