Taghipour-Darzi Mohammad, Ebrahimi-Takamjani Esmail, Salavati Mahyar, Mobini Bahram, Zekavat Hajar
Department of Physiotherapy, Faculty of Medicine, Babol University of Medical Sciences, Babol, Mazandaran, Iran.
J Back Musculoskelet Rehabil. 2009;22(3):149-56. doi: 10.3233/BMR-2009-0228.
For center of rotation (COR) and centroid length variables in lumbar flexion-extension radiography, enough reliability information is not available.
The objective of this study was to determine the intra-rater reliability of COR and centroid length of lumbar intervertebral movement.
A methodological research for reliability was designed. Fifteen males with chronic non specific low back pain aged between 22-43 years participated in this study. Study variables included COR of full, flexion and extension arc and centroid length. The proposed method from Putto was used for flexion-extension radiography. Five x-rays were taken in neutral, full flexion and extension, mid-flexion and mid-extension positions. The variables were calculated using Computer Aided Radiographic Analysis of Spine (CARA) software after scanning. The intraclass correlation coefficient (ICC) and standard error of measurement (SEM) were utilized for relative and absolute reliability respectively.
The results demonstrated high ICC values on x axis (range: 0.67-0.88) and y axis (range: 0.55-0.90) for full arc COR, high ICC values of flexion arc COR on x axis (range: 0.54-0.97) and y axis (range: 0.48-0.99). ICC values results of extension arc ranged between 0.19-0.60 for x axis and 0.16-0.83 for y axis. ICC values for centroid length ranged between 0.22-0.88.
Results support previous studies which show very high reliability of full arc COR. In addition, flexion arc COR has desirable reliability and low measurement errors. But, extension arc COR and centroid length have moderate reliability and large measurement errors.
对于腰椎屈伸位X线摄影中的旋转中心（COR）和质心长度变量，尚无足够的可靠性信息。
本研究的目的是确定腰椎椎间运动COR和质心长度的同一评估者内可靠性。
设计了一项关于可靠性的方法学研究。15名年龄在22 - 43岁之间的慢性非特异性下腰痛男性参与了本研究。研究变量包括全弧、屈曲弧和伸展弧的COR以及质心长度。采用Putto提出的方法进行屈伸位X线摄影。在中立位、全屈曲和伸展位、半屈曲和半伸展位拍摄了五张X线片。扫描后使用脊柱计算机辅助放射分析（CARA）软件计算变量。组内相关系数（ICC）和测量标准误差（SEM）分别用于相对可靠性和绝对可靠性。
结果显示，全弧COR在x轴上的ICC值较高（范围：0.67 - 0.88），在y轴上的ICC值较高（范围：0.55 - 0.90）；屈曲弧COR在x轴上的ICC值较高（范围：0.54 - 0.97），在y轴上的ICC值较高（范围：0.48 - 0.99）。伸展弧在x轴上的ICC值范围为0.19 - 0.60，在y轴上的ICC值范围为0.16 - 0.83。质心长度的ICC值范围为0.22 - 0.88。
结果支持先前的研究，这些研究表明全弧COR具有非常高的可靠性。此外，屈曲弧COR具有良好的可靠性和较低的测量误差。但是，伸展弧COR和质心长度具有中等可靠性和较大的测量误差。
