Interobserver and intraobserver reliability of determining the deformity angular ratio in severe pediatric deformity cur
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Interobserver and intraobserver reliability of determining the deformity angular ratio in severe pediatric deformity curves Scott L. Zuckerman1 · Lawrence G. Lenke1 · Meghan Cerpa1 · Michael P. Kelly2 · Burt Yaszay3 · Paul Sponseller4 · Mark Erickson5 · Sumeet Garg5 · Joshua Pahys6 · Patrick Cahill7 · Brenda Sides2 · Munish Gupta2 · Fox Pediatric Spinal Deformity Study Group Received: 19 April 2020 / Accepted: 19 October 2020 © Scoliosis Research Society 2020
Abstract Study design Cross-sectional reliability study. Objective The deformity angular ratio (DAR) is a means of quantifying magnitude of the coronal (C-DAR) and sagittal (S-DAR) plane of deformity curves to produce a total DAR (T-DAR). It has been shown to predict the risk of spinal cord monitoring alerts and actual neurologic deficits. We sought to assess the reliability of determining the C-DAR and S-DAR among pediatric spinal deformity surgeons. Methods Twelve preoperative anterior–posterior (AP) and lateral X-rays from the Fox multi-center pediatric deformity study were de-identified and sent to7 pediatric spinal deformity surgeons. Each surgeon measured: coronal/sagittal Cobb angles, upper/lower endplate vertebrae (UEV/LEV), apices, and number of vertebrae included in the main curve. The C-DAR and S-DAR were then calculated by dividing the Cobb angles by the number of vertebrae included in the curve. Intra- and interobserver reliability was calculated using interclass correlation (ICC). Results The mean C-DAR was 14.9 (range 1.3–51.5) with a mean Cobb angle of 88.8° (range 15.0–163.0) over a mean of 7.5 (range 2.0–14.0) levels. The mean S-DAR was 8.6 (range 1.0–19.6), with a mean Cobb angle of 68.0° (range 10.0–137.0) over a mean of 7.5 (range 3–11) levels. The intraobserver reliability of the C-DAR was ICC = 0.908 (range 0.846–0.960) and the S-DAR 0.914 (range 0.815–0.961). The interobserver reliability of the C-DAR was ICC = 0.868 (range 0.846–0.938), and the S-DAR was ICC = 0.848 (range 0.815–0.961). Despite poor reliability among UEV, LEV, and apex selection (aggregated range 0.340–0.724), the C-DAR and S-DAR were demonstrated to be reliable in our study Conclusions Reliability was good to excellent for C-DAR and S-DAR, despite poor to moderate reliability among UEV, LEV, and apex selection. These data support the use of the C-DAR, S-DAR, and combined T-DAR as a means of quantifying deformity magnitude. Keywords Spinal deformity · Pediatric · Cobb angle · Scoliosis · Neuromuscular scoliosis · Early onset scoliosis · Deformity angular ratio
Disclosure This abstract was presented the 2015 Scoliosis Research Society Annual Meeting.
Abbreviations DAR Deformity angular ratio LEV Lower endplate vertebrae UEV Upper endplate vertebrae
* Meghan Cerpa [email protected]
3
Rady Children’s Hospital, San Diego, USA
4
Johns Hopkins University, Baltimore, USA
1
5
Children’s Hospital Colorado Aurora, Aurora, USA
6
Shriners Hospitals for Children, Philadelphia, USA
7
Children’s Hospital of Philadelphia, Ph
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