Tillotson K M, Burton A K
Department of Computer Studies and Mathematics, Huddersfield Polytechnic, United Kingdom.
Spine (Phila Pa 1976). 1991 Jan;16(1):29-33. doi: 10.1097/00007632-199101000-00005.
The use of flexicurves to measure lumbar sagittal mobility was subjected to a series of reliability and validation experiments. Appropriate statistical methods were described and used to quantify intraobserver and intrasubject variability and to determine limits of agreement with measurements from radiographs. It was shown that the traditional use of correlation coefficients can produce misleading or inadequate information. The flexicurve technique had an intraobserver variability of 3-4 degrees of movement, was not significantly influenced by intrasubject variability, and provided measurements typically within 6 degrees of radiographic measurements. The data suggest that the flexicurve technique is less biased than the inclinometric method. These results demonstrate the use of suitable statistical methods to assess the clinical usefulness, or level of interchangeability, of spinal measurement instruments.
使用柔性曲线测量腰椎矢状面活动度进行了一系列可靠性和验证实验。描述并使用了适当的统计方法来量化观察者内和受试者内的变异性，并确定与X线片测量结果的一致性界限。结果表明，传统的相关系数使用可能会产生误导性或不充分的信息。柔性曲线技术的观察者内变异性为3 - 4度运动，不受受试者内变异性的显著影响，并且提供的测量结果通常与X线片测量结果相差在6度以内。数据表明，柔性曲线技术的偏差小于倾角测量法。这些结果证明了使用合适的统计方法来评估脊柱测量仪器的临床实用性或互换性水平。
