IR@PKUHSC  > 北京大学第三临床医学院  > 骨科
学科主题临床医学
Interobserver reliability and intraobserver reproducibility of powers ratio for assessment of atlanto-occipital junction: comparison of plain radiography and computed tomography
Li, Gang1,2; Passias, Peter1; Kozanek, Michal1; Shannon, Brian D.1; Li, Guoan1; Villamil, Fernando1; Bono, Christopher M.3; Harris, Mitchel3; Wood, Kirkham B.1
关键词Powers Ratio Interobserver Reliability Intraobserver Reproducibility Atlanto-occipital Junction
刊名EUROPEAN SPINE JOURNAL
2009-04-01
DOI10.1007/s00586-008-0877-5
18期:4页:577-582
收录类别SCI
文章类型Article
WOS标题词Science & Technology
类目[WOS]Clinical Neurology ; Orthopedics
研究领域[WOS]Neurosciences & Neurology ; Orthopedics
关键词[WOS]ATLANTO-OCCIPITAL DISLOCATION
英文摘要

Powers ratio, as assessed on plain radiographs or computed tomography (CT) images, appears to have clinical and prognostic value. To date, the validation of this assessment tool has been limited to a small number of observers at a single site. No study has examined the intraobserver reproducibility and interobserver reliability of the Powers ratio measurement on plain radiographs or CT images among a large cohort of spine surgeons. This type of validation is critical to allow for the broader use of the Powers ratio methodology in research studies and clinical applications. Plain radiographs and spiral CT images of the cervical spine of 32 patients were assessed, and the Powers ratio was determined by five spine surgeons. Each surgeon performed three readings, 7 months apart. In the first round of measurements, the observers used only the Powers′ method of instruction. The second and third measurement sets were obtained after an interactive teaching session on the methodology. The order of the images was altered for the second and third set of measurements. The coefficient of variation (Cv) was calculated to determine the intraobserver repeatability and interobserver reliability for each imaging technique. A Bland-Altman plot was then used to assess the agreement between the two imaging techniques. For interobserver reliability, the mean Cv of the Powers ratio was 9.09 and 4.31% for plain radiographs and CT, respectively. The Cv mean value for intraobserver reproducibility averaged 4.95% (range 1.39-9.08) when CT scans were used and 14.17% (range 7.54-34.30) when plain radiographs were used. For intraobserver reproducibility, the lowest and highest Cv mean value of five raters was 1.39 and 9.08% using CT scans and 7.54 and 34.3% using plain radiographs. The Bland-Altman plot, demonstrated that the two methods were in close agreement on the -0.8 and 0.89% interval for limits of agreement (bias +/- A 1.96 sigma). The intraobserver reproducibility and interobserver reliability of Powers ratio measurement was acceptable (< 5%) with CT scans but not with plain radiographs. However, despite the statistically inferior reliability and repeatability, the Bland-Altman plot analysis showed that given the -0.8 and 0.89% limits of agreement, the two methods may be used interchangeably in clinical practice.

语种英语
WOS记录号WOS:000264834600018
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
文献类型期刊论文
条目标识符http://ir.bjmu.edu.cn/handle/400002259/51999
Collection北京大学第三临床医学院_骨科
作者单位1.Massachusetts Gen Hosp, Dept Orthoped, Spine Serv, Boston, MA 02114 USA
2.Peking Univ, Hosp 3, Dept Orthopaed, Beijing 100083, Peoples R China
3.Brigham & Womens Hosp, Dept Orthoped, Spine Serv, Boston, MA 02115 USA
Recommended Citation
GB/T 7714
Li, Gang,Passias, Peter,Kozanek, Michal,et al. Interobserver reliability and intraobserver reproducibility of powers ratio for assessment of atlanto-occipital junction: comparison of plain radiography and computed tomography[J]. EUROPEAN SPINE JOURNAL,2009,18(4):577-582.
APA Li, Gang.,Passias, Peter.,Kozanek, Michal.,Shannon, Brian D..,Li, Guoan.,...&Wood, Kirkham B..(2009).Interobserver reliability and intraobserver reproducibility of powers ratio for assessment of atlanto-occipital junction: comparison of plain radiography and computed tomography.EUROPEAN SPINE JOURNAL,18(4),577-582.
MLA Li, Gang,et al."Interobserver reliability and intraobserver reproducibility of powers ratio for assessment of atlanto-occipital junction: comparison of plain radiography and computed tomography".EUROPEAN SPINE JOURNAL 18.4(2009):577-582.
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