• H M van West, J Herfkens, RutgesJ P H JJPHJhttp://orcid.org/0000-0002-9452-415XDepartment of Orthopedic Surgery, Room NC-414, Erasmus MC University Medical Centre, PO Box 2040, 3000 CA, Rotterdam, The Netherlands., and M Reijman.
• Department of Orthopedic Surgery, Room NC-414, Erasmus MC University Medical Centre, PO Box 2040, 3000 CA, Rotterdam, The Netherlands. h.vanwest@erasmusmc.nl.
• Eur Spine J. 2022 Apr 1; 31 (4): 990-995.

Purpose (Main Purposes And Research Question)The purpose of this study is to assess the accuracy and precision of the smartphone with application and casing (Scolioscreen) compared to the Scoliometer.MethodsThe Axial Trunk Rotation (ATR) was measured in adolescent scoliosis patients visiting the outpatient clinic while performing the Adam Forward Bending Test. The Scolioscreen measurements were performed by the orthopedic surgeon and a parent. They were compared to the measurement with the Scoliometer by the orthopedic surgeon, the gold standard. The accuracy was determined with the Pearson's correlation coefficient, and precision was determined by assessing the intra- and inter-variability with the intra-class correlation coefficient (ICC).ResultsFifty patients with adolescent idiopathic scoliosis (44 girls) were included with a mean age of 14.1 years and a mean Cobb angle of 38.5°. The accuracy of both the parents and orthopedic surgeon was excellent with a Pearson correlation coefficient of 0.92 and 0.97, respectively. All the ICC's, both intra- and inter-observer, were over 0.92 demonstrating excellent precision.ConclusionThis study confirms the accuracy and precision of the Scolioscreen when measuring the ATR on patients with AIS. Therefore, the Scoliometer can be replaced by the more easily available Scolioscreen which can be used by both physician and parents.© 2021. The Author(s).

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