Chinese Journal of Tissue Engineering Research ›› 2010, Vol. 14 ›› Issue (48): 8993-8997.doi: 10.3969/j.issn.1673-8225.2010.48.016

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Reliability assessment for idiopathic scoliosis different Cobb angles by X-ray

Sheng Wen-hui 1,2, Xun Chuan-hui1, Wu Bing2, Xu Tao1, Zheng Xin-feng1, Shang Qi-song2, Sheng Wei-bin1   

  1. 1 Department of Orthopaedic Surgery, First Affiliated Hospital of Xinjiang Medical University, Urumchi  832054, Xinjiang Uygur Autonomous Region, China; 2 First Department of Orthopedics, Shihezi People’s Hospital, Shihezi   832000, Xinjiang Uygur Autonomous Region, China
  • Online:2010-11-26 Published:2010-11-26
  • Contact: Sheng Wei-bin, Doctor, Professor, Chief physician, Department of Orthopaedic Surgery, First Affiliated Hospital of Xinjiang Medical University, Urumchi 832054, Xinjiang Uygur Autonomous Region, China wbsheng_xjmu@hotmail.com
  • About author:Sheng Wen-hui★, Studying for master’s degree, Associate chief physician, Department of Orthopaedic Surgery, First Affiliated Hospital of Xinjiang Medical University, Urumchi 832054, Xinjiang Uygur Autonomous Region, China; First Department of Orthopedics, Shihezi People’s Hospital, Shihezi 832000, Xinjiang Uygur Autonomous Region, China wyc_one@sina.com

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Abstract:

BACKGROUND: The measurement of Cobb angles is one of the most important factors to affect the reliability of the King, Lenke, and PUMC classification system for idiopathic scoliosis. Studies show reliability of coronal Cobb angle measurements. However, the range of Cobb angles in studies is too wide to contrast the results of these studies. Moreover, relatively few studies have attempted to validate the reliability of different coronal Cobb angles.
OBJECTIVE: To determine the reliability and reproducibility of the different Cobb angles for idiopathic scoliosis.
METHODS: A total of 94 curves of 53 patients, including 53 main thoracic curves and 41 thoracolumbar/lumbar curves, were evaluated by four orthopedic surgeons independently. Two weeks later, the sequence of the X-ray films was re-ordered and re-measured. Reliability and reproducibility was quantified using intraclass correlation coefficient.
RESULTS AND CONCLUSION: Coronal Cobb angle measurement of total curves demonstrated excellent intraobserver reproducibility (0.961-0.977) and interobserver reliability (0.972, 95% confidence interval 0.919-0.964), and had a measurement error average 7.3° (range 20°-27°). The measurement average error was 6.4° (range 20°-14°) in 41 curves of Cobb angles from 46° to 70° and this curves demonstrated best reliability than other curves, intraobserver 0.914-0.930, interobserver 0.960 (95% confidence interval 0.935-0.977). The measurement error average was 6.5° (range 20°-13°) and 10.1° (range 30°-27°) in 31 curves of Cobb angles from 20° to 45°and more than 70° respectively. These two groups demonstrated excellent intraobserver reproducibility (0.854-0.912 and 0.864-0.950) and interobserver reliability (0.933 and 0.926, 95% confidence interval 0.884-0.965 and 0.865-0.965), respectively. Results of reliability were similar between different Cobb angles and measurement error for larger Cobb angles had very little effect to reliability.

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