MEASUREMENT OF THE COBB ANGLE ON RADIOGRAPHS OF PATIENTS WHO HAVE SCOLIOSIS - EVALUATION OF INTRINSIC ERROR
MEASUREMENT OF THE COBB ANGLE ON RADIOGRAPHS OF PATIENTS WHO HAVE SCOLIOSIS - EVALUATION OF INTRINSIC ERROR
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DOI：
10.2106/00004623-199072030-00002
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发表时间：
1990-03-01
影响因子：
5.3
通讯作者：
COWIE, GH
中科院分区：
文献类型：
--
作者：
MORRISSY, RT;GOLDSMITH, GS;COWIE, GH
为了量化测量中的固有误差，由四名骨科医生使用Cobb方法在六次不同的情况下测量了50例脊柱侧凸患者的正位x线片。对于前两次测量（集合I），每个观测者选择曲线的末端椎骨；对于接下来的两次测量（第二组），椎末是预先选择和固定的。最后两次测量（第三组）的方法与第二组相同，不同之处在于每个考官使用同一量角器，而不是随身携带的量角器。所有四个观察者的汇总结果表明，观察者内部变异性的95%置信限对于集合I为4.9度，对于集合II为3.8度，对于集合III为2.8度。组I的观察者间变异度为7.2度，组II和组III的观察者间变异度为6.3度。观察者之间的平均角度差异显著，但当观察者使用相同的量角器时，差异较小。
To quantitate the intrinsic error in measurement, fifty anteroposterior radiographs of patients who had scoliosis were each measured on six separate occasions by four orthopaedic surgeons using the Cobb method. For the first two measurements (Set I), each observer selected the end-vertebrae of the curve; for the next two measurements (Set II), the end-vertebrae were pre-selected and constant. The last two measurements (Set III) were obtained in the same manner as Set II, except that each examiner used the same protractor rather than the one that he carried with him. The pooled results of all four observers suggested that the 95 per cent confidence limit for intraobserver variability was 4.9 degrees for Set I, 3.8 degrees for Set II, and 2.8 degrees for Set III. The interobserver variability was 7.2 degrees for Set I and 6.3 degrees for Set II and III. The mean angles differed significantly between observers, but the difference was smaller when the observers used the same protractor.