Baumann角测量的意义及其影响因素

Significance of Baumann's Angle and Its Affecting Factors

目的:研究 Baumann 角的正常值及其影响因素对预测肱骨髁上骨折肘内翻的意义。方法:测量2～12岁正常儿童110人,204肘,分别测 Baumann 角(B 角)和提携角(C 角)。在肱骨髁上骨折模型上,肱骨远端在内倾、屈曲、旋转三维状态下分别摄 X 线片测 B 角改变。结果:B角平均70.5±5.35°,C 角平均9.81±4.29°。B 角和 C 角性别间无显著性差异(P>0.05);年龄间的回归关系有非常显著的意义(P<0.01)。B 角与 C 角间有非常显著的负相关(r=-0.308,P<0.01)。B 角增加0.5～0.7°,C 角约减少1°。骨折远端在常见的内倾、屈曲、旋转三维状态下,B角发生显著改变,有非常显著的相关性(P<0.01)。远端内倾对 B 角影响最大,屈曲次之,旋转最小。结论:测量 B 角可预测 C 角,应充分估计骨折移位对 B 角可能的影响,才能更准确地预测肘内翻。

Objective:To investigate the normal value of Baumann's angle and factors influ- encing on the measurement,and to predict a complicated cubitus varus deformity in humeral supracondylar fractures.Methods:Baumann's angle(angle B)and carrying angle(angle C)were measured in 110 normal children(aged 2—12 years,204 elbows).In a model of supracondylar fracture of humerus,angle B was collected on X-ray films in trimensional conditions of medial til- ting,flexion and rotation of the distal fragment.The data were analysed statistically.Results: The average value of angle B was 70.5±5.35°and angle C 9.81±4.29°.There was no significant difference in sex(P>0.05),but a significant regression in age(P<0.01).Angle B varies re- versely as angle C.The sequence of factors influencing on angle B were medial tilting,flexion and rotation of the distal fragment.Conclusions:The change of angle B can be used as reference to predict the complicated cubitus varus in supracondylar fracture of the humerus.