Answer to the Letter to the Editor of M. A. Potts concerning “Providence nighttime bracing is effective in treatment for adolescent idiopathic scoliosis even in curves larger than 35°” by Simony A, Beuschau I, Quisth L, et al. [Eur Spine J; (2019):]

  • Ane SimonyEmail author
Author’s Reply

Firstly, we would like to thank the author of the Letter to the Editor for his kind word regarding our publication. We are very grateful that the spine community finds value in our work and takes the time to thoroughly read through the data.

Regarding the questions, we have tried to address them below:
  1. 1.

    Predictors for brace outcome are curve size, Risser stage and also the flexibility of the curve, as described in the study by Ohrt-Nissen et al. 2016 [1] where an increase in curve flexibility was associated with a decrease in risk of curve progression while treating with Providence nighttime braces (PNB). The first study published comparing PNB to Boston bracing by Yrjönen et al. 2006 [2] described 92% in brace correction in the PNB group and 50% in brace correction the group braces with Boston braces. This study has served as a guideline, and since the wear time is reduced to 7–8 h, it is essential to achieve better curve correction during part time bracing. In our study, the mean...


Compliance with ethical standard

Conflict of interest

The author declares that she has no conflict of interest.


  1. 1.
    Ohrt-Nissen S, Hallager DW, Gehrchen M, Dahl B (2016) Flexibility predicts curve progression in providence nighttime bracing of patients with adolescent idiopathic scoliosis. Spine 22:1724–1730CrossRefGoogle Scholar
  2. 2.
    Yrjönen T, Ylikoski M, Schlenzka D, Kinnunen R, Poussa M (2006) Effectiveness of the Providence nighttime bracing in adolescent idiopathic scoliosis: a comparative study of 36 female patients. Eur Spine J 15:1139–1143CrossRefGoogle Scholar
  3. 3.
    D’Amato CR, Griggs S, McCoy B (2001) Nighttime bracing with the Providence brace in adolescent girls with idiopathic scoliosis. Spine 26:2006–2012CrossRefGoogle Scholar
  4. 4.
    Ohrt-Nissen S, Lastikka M, Andersen TB, Helenius I, Gehrchen M (2019) Conservative treatment of main thoracic adolescent idiopathic scoliosis: full-time or nighttime bracing? J Orthop Surg 27:2309499019860017. CrossRefGoogle Scholar

Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2020

Authors and Affiliations

  1. 1.Sector for Spine Surgery and ResearchMiddelfart HospitalMiddelfartDenmark

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