Morgan S J, Groshen S L, Itamura J M, Shankwiler J, Brien W W, Kuschner S H
University of Southern California School of Medicine, Department of Orthopaedic Surgery, LAC-USC General Hospital, Los Angeles, USA.
Bull Hosp Jt Dis. 1997;56(2):95-8.
Inter-observer and intra-observer reliability for classifying radial head fractures by the system of Mason was analyzed. Twenty-three cases of isolated radial head fractures and twenty-five sets of corresponding AP and lateral radiographs representing these fractures were assembled. The cases were reviewed and assessed independently according to the system of Mason by twenty practicing orthopedic surgeons. On two occasions, the inter-observer and intra-observer variation was analyzed by standard unweighted Kappa statistics. In both observations, complete agreement was seen in only 16% of the cases. Kappa statistic values indicated that 69% of the cases at first observation and 45% of the cases at second observation suggest moderate to poor agreement. Intra-observer agreement between the first and second observation was graded fair to poor in 60% of the cases. Individual observer consistency was, on average, only 78% (range 60% to 92%). The demonstrated wide degree of variation suggests that the Mason classification is unreliable.
分析了采用梅森（Mason）系统对桡骨头骨折进行分类时观察者间和观察者内的可靠性。收集了23例单纯桡骨头骨折病例以及代表这些骨折的25组相应前后位和侧位X线片。20名执业骨科医生根据梅森系统对这些病例进行了独立的回顾和评估。通过标准非加权卡方统计分析了两次观察者间和观察者内的差异。在两次观察中，仅16%的病例达成完全一致。卡方统计值表明，第一次观察中69%的病例以及第二次观察中45%的病例显示出中度至较差的一致性。60%的病例在第一次和第二次观察之间的观察者内一致性被评为一般至较差。个体观察者的一致性平均仅为78%（范围为60%至92%）。所显示的广泛差异程度表明梅森分类不可靠。
