Variability in Cobb angle measurements using reformatted computed tomography scans
Adam, Clayton J., Izatt, Maree T., Harvey, Jason R., & Askin, Geoffrey N. (2005) Variability in Cobb angle measurements using reformatted computed tomography scans. Spine: an international journal for the study of the spine, 30(14), pp. 1664-1669.
Study Design: Survey of intra and inter-observer measurement variability. Objectives: To assess the use of reformatted computed tomography (CT) images for manual measurement of coronal Cobb angles in idiopathic scoliosis. Summary of Background Data: Cobb angle measurements in idiopathic scoliosis are traditionally made from standing radiographs, whereas CT scans are often used for assessment of vertebral rotation. Correlating Cobb angles from standing radiographs with vertebral rotations from supine CT is problematic since the geometry of the spine changes significantly from standing to supine positions, and two different imaging modalities are involved. Methods: We assessed the use of reformatted thoracolumbar CT images for Cobb angle measurement. Pre-operative computed tomography scans of twelve idiopathic scoliosis patients were used to generate reformatted coronal images. Five observers measured coronal Cobb angles on three occasions from each of the images. Intra and inter-observer variability associated with Cobb measurement from reformatted CT scans was assessed and compared with previous studies of measurement variability using plain radiographs. Results: For major curves, 95% confidence intervals for intra and inter-observer variability were ±4.3 degrees and ±7.5 degrees respectively. For minor curves, the intervals were ±5.1 degrees and ±7.4 degrees. Intra and inter-observer TEMs were 2.4 degrees and 2.7 degrees, with reliability coefficients of 88% and 84%. There was no correlation between measurement variability and curve severity. Conclusions: Reformatted CT images may be used for manual measurement of coronal Cobb angles in idiopathic scoliosis with similar variability to manual measurement of plain radiographs.
Citation countsare sourced monthly fromand citation databases.
These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.
Citations counts from theindexing service can be viewed at the linked Google Scholar™ search.
Full-text downloadsdisplays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.
|Item Type:||Journal Article|
|Additional Information:||Author contact details: firstname.lastname@example.org|
|Keywords:||Idiopathic scoliosis, Cobb angle, computed tomography, measurement variability|
|Subjects:||Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Biomechanical Engineering (090302)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering|
|Copyright Owner:||Copyright 2005 Lippincott, Williams & Wilkins|
|Copyright Statement:||This is the author-version of the work. The final, definitive version of this article has been published in the Journal, < Spine : An international journal for the study of the spine 30(14):pp. 1664-1669, 2005 © < Lippincott, Williams & Wilkins.|
|Deposited On:||16 Mar 2006|
|Last Modified:||29 Feb 2012 23:16|
Repository Staff Only: item control page