Wu Gui, Wang Hai, Ding Ran, Xue Xu-hong, Wu Zhi-hong, Qiu Gui-xing
Department of Orthopaedics, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China.
Chin Med Sci J. 2015 Mar;30(1):18-22. doi: 10.1016/s1001-9294(15)30003-1.
To introduce a novel Cobb protractor and assess its reliability and rapidity for measuring Cobb angle in scoliosis patients.
The novel Cobb protractor had two endplate markers. A measurement was performed just to align the two markers to each endplate of the curve. The Cobb angle on the posteroanterior radiographs of 24 patients clinically diagnosed with adolescent idiopathic scoliosis was measured by three orthopedic surgeons with both standard Cobb method and the new technique, and the time of measurement was recorded. Intraclass correlation coefficients (ICCs) were calculated to assess the reliability of the new method.
The time for a measurement with the new tool was approximately 10 seconds less than the time that used to finish a measurement with the standard method (P<0.05). The overall mean Cobb angle for the major curve of the 24 patients was 47.8°. The mean overall intraobserver and interobserver ICC was 0.971 and 0.971 for the Cobb method group, while the overall intraobserver ICC and the interobserver was 0.985 and 0.979 for the new tool group.
The novel Cobb protractor could perform quick measurement and measure almost all forms of radiographs. The Cobb protractor might be an ideal instrument to measure the Cobb angle.
介绍一种新型科布量角器，并评估其在测量脊柱侧凸患者科布角时的可靠性和速度。
新型科布量角器有两个终板标记。测量时只需将两个标记与曲线的每个终板对齐。由三名骨科医生分别用标准科布法和新技术测量24例临床诊断为青少年特发性脊柱侧凸患者的正位X线片上的科布角，并记录测量时间。计算组内相关系数（ICC）以评估新方法的可靠性。
使用新工具进行一次测量的时间比用标准方法完成一次测量的时间大约少10秒（P<0.05）。24例患者主弯的总体平均科布角为47.8°。科布法组观察者内和观察者间的总体平均ICC分别为0.971和0.971，而新工具组观察者内总体ICC和观察者间ICC分别为0.985和0.979。
新型科布量角器测量速度快，几乎能测量所有形式的X线片。该科布量角器可能是测量科布角的理想工具。
