| A computer-aided Cobb angle measurement method and its reliability. | |
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MedLine Citation:
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PMID: 20124919 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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STUDY DESIGN: Development of a computer-aided Cobb measurement method and evaluation of its reliability. OBJECTIVES: To reduce the variability of Cobb angle measurement by developing the computer-aided method and to investigate if the developed method is sensitive to observer skill levels or experiences. SUMMARY OF BACKGROUND DATA: Therapeutic decisions for scoliosis heavily rely on the Cobb angle measured from consecutive radiographs. The manual Cobb measurement is subject to human errors. The observer error is 3 to 10 degrees resulted from different end-vertebrae selection and/or manually drawing variable best-fit lines to the endplates of the end-vertebrae. METHODS: A fussy Hough transform technique was used to develop a computer-aided method to detect the vertebral endplates. The Cobb angle, upper end-vertebra, and lower end-vertebra were then measured automatically. The computer-aided method was tested twice by each of 3 observers in 84 posteroanterior radiographs from patients with adolescent idiopathic scoliosis. The intraobserver and interobserver errors were analyzed. RESULTS: Both the intraobserver and interobserver reliability analyses resulted in the intraclass correlation coefficients higher than 0.9 for the Cobb angle. The average intraobserver and interobserver errors were less than 3 degree for the Cobb angle, and less than 0.3 levels for both the upper and lower end-vertebral identification. There were no significant differences in the measurement variability between groups of curve location (thoracic, thoracolumbar, and lumbar), curve direction (right and left), curve magnitude (curves less than 25 degree, between 25 and 45 degrees, and more than 45 degree), and observer experience (experienced observer and inexperienced observers). CONCLUSIONS: Compared with the documented results, variability of the Cobb measurement is reduced by using the developed computer-aided method. This method can help orthopedic surgeons measure the Cobb angle more reliably during scoliosis clinics. |
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Authors:
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Junhua Zhang; Edmond Lou; Xinling Shi; Yuanyuan Wang; Douglas L Hill; James V Raso; Lawrence H Le; Liang Lv |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of spinal disorders & techniques Volume: 23 ISSN: 1539-2465 ISO Abbreviation: J Spinal Disord Tech Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-08-04 Completed Date: 2010-11-12 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101140323 Medline TA: J Spinal Disord Tech Country: United States |
Other Details:
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Languages: eng Pagination: 383-7 Citation Subset: IM |
Affiliation:
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Department of Electronic Engineering, Yunnan University, Yunnan, China. jhzhang_2006@yahoo.com.cn |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Female Humans Lumbar Vertebrae / radiography* Male Observer Variation Radiographic Image Interpretation, Computer-Assisted* Reproducibility of Results Scoliosis / radiography* Thoracic Vertebrae / radiography* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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