Medical College of Wisconsin
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Reproducibility of spinal back-contour measurements taken with raster stereography in adolescent idiopathic scoliosis. Am J Orthop (Belle Mead NJ) 2004 Feb;33(2):67-70 PMID: 15005595

Pubmed ID



200 children with a mean age of 12.7 years were measured with the Quantec Spinal Image System (QSIS), which uses computerized raster stereography technology. The aim of the study was to assess the intraobserver reproducibility of QSIS metrics in scoliosis patients and to quantify the effect of postural sway on the measurements. Children were randomly assigned to 1 of 2 groups: Group 1 contained 198 subjects, having 3 digitized measurements of 1 scan; Group 2 contained 200 subjects, undergoing 3 separate QSIS scans with 1 measurenent of each scan. Random-effects variance components models were fit to each outcome variable of interest (subject, scan or measurement) separately for the single scan dataset and the 3 scan dataset. They revealed that data from Group 2 contained greater reliability than data from Group 1 (reliability > or = 80%). The reliability of these parameters was perfect if one performed 3 scans and 3 measurements per scan. Results demonstrate that the QSIS with 3 scans and 1 measurement yields reproducible data from mild idiopathic scoliosis patients and that postural sway has minimal effect on data reproducibility.

Author List

Lyon R, Liu XC, Thometz JG, Nelson ER, Logan B


Brent R. Logan PhD Director, Professor in the Institute for Health and Equity department at Medical College of Wisconsin
John G. Thometz MD Professor in the Orthopaedic Surgery department at Medical College of Wisconsin


2-s2.0-2542424857   12 Citations

MESH terms used to index this publication - Major topics in bold

Disease Progression
Image Processing, Computer-Assisted
Reproducibility of Results
jenkins-FCD Prod-332 f92a19b0ec5e8e1eff783fac390ec127e367c2b5