• Anne Tabard-Fougère, Alice Bonnefoy-Mazure, Sylviane Hanquinet, Pierre Lascombes, Stéphane Armand, and Romain Dayer.
• *Willy Taillard Laboratory of Kinesiology, Geneva University Hospitals and Geneva University, Switzerland. †Division of Peadiatric Orthopaedics, Children's University Hospital of Geneva, Geneva, Switzerland ‡Division of Orthopaedics and Trauma Surgery, Geneva University Hospitals, Faculty of Medicine, Geneva, Switzerland. §Division of Pediatric Radiology, Children's University Hospital of Geneva, Geneva, Switzerland.
• Spine. 2016 May 11.

Study DesignTest-retest study OBJECTIVE.: This study aimed to evaluate the validity and reliability of rasterstereography in patients with adolescent idiopathic scoliosis (AIS) with a major curve Cobb angle (CA) between 10° and 40° for frontal, sagittal and transverse parameters.Summary Of Background DataPrevious studies evaluating the validity and reliability of rasterstereography concluded that this technique had good accuracy compared with radiographs and a high intra- and inter-day reliability in healthy volunteers. To the best of our knowledge, the validity and reliability have not been assessed in AIS patients.MethodsThirty-five adolescents with AIS (male = 13) aged 13.1 ± 2.0 years were included. To evaluate the validity of the scoliosis angle (SA) provided by rasterstereography, a comparison (t-test, Pearson correlation) was performed with the CA obtained using 2D EOS® radiography (XR). Three rasterstereographic repeated measurements were independently performed by two operators on the same day (interrater reliability) and again by the first operator one week later (intrarater reliability). The variables of interest were the SA, lumbar lordosis and thoracic kyphosis angle, trunk length, pelvic obliquity and maximum, root mean square and amplitude of vertebral rotations. The data analyses used intraclass correlation coefficients (ICCs).ResultsThe CA and SA were strongly correlated (R = 0.70) and were non-significantly different (p = 0.60). The intrarater reliability (same day: ICC (1, 1), n = 35; one week later: ICC (1, 3), n = 28) and interrater reliability (ICC (3, 3), n = 16) were globally excellent (ICC > 0.75) except for the assessment of pelvic obliquity.ConclusionsThis study showed that the rasterstereographic system allows for the evaluation of AIS patients with a good validity compared to XR with an overall excellent intra- and interrater reliability. Based on these results, this automatic, fast and non-invasive system can be used for monitoring the evolution of AIS in growing patients instead of repetitive radiographs, thereby reducing radiation exposure and decreasing costs.Level Of Evidence4.

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