Hardcastle P H, Ross R, Hamalainen M, Mata A
J Bone Joint Surg Br. 1980 Nov;62-B(4):428-31. doi: 10.1302/0301-620X.62B4.7430217.
A study was undertaken to assess the degree of inter-observer error when a panel of observers classified the radiographs of patients with early Perthes' disease, using Catterall grouping and "at risk" signs. The anteroposterior and lateral radiographs, taken within three months of diagnosis of Perthes' disease, were available for 69 hips and were shown in turn to 10 observers. The radiological end-results were assessed at least four years from diagnosis. The results showed a poor ability of the observers to delineate Groups 1, 2 and 3, with a more satisfactory performance in Group 4 and when Groups 2 and 3 were combined. Interpretation of "at risk" signs was unsatisfactory except when there was an increase in medial joint space greater than two millimetres. The end-results correlated well with early Catterall grouping and "at risk" signs when these were correctly interpreted.
开展了一项研究，以评估一组观察者在使用卡特拉尔（Catterall）分组法和“风险”征象对早期佩特兹氏（Perthes）病患者的X光片进行分类时，观察者间误差的程度。在佩特兹氏病诊断后的三个月内拍摄的前后位和侧位X光片可供69个髋关节使用，并依次展示给10位观察者。放射学最终结果在诊断后至少四年进行评估。结果显示，观察者区分1、2和3组的能力较差，在4组以及2组和3组合并时表现更令人满意。对“风险”征象的解读并不理想，除非内侧关节间隙增宽超过两毫米。当早期卡特拉尔分组法和“风险”征象被正确解读时，最终结果与之相关性良好。
