桡骨头脱位(subluxation of the head of the radius)多发生于5岁以下儿童。小儿肱桡关节环状韧带前下方较薄弱，桡骨小头关节面略向后方远端与桡骨干的纵轴不完全垂直，且呈卵圆形。在旋后位时，矢状径较长，在极度旋前位时，桡骨下头略离开尺骨的桡骨切迹，其前外侧边缘较低平而位于偏远端，当前臂旋前位用力牵拉手腕，环状韧带容易向桡骨小头前外侧近端滑移。其薄弱点容易被横行撕破，桡骨小头前方即在环状韧带前下方脱位。随年龄的增长，环状韧带薄弱的附着点逐渐增厚和加强，故不易脱出
术中应该解剖复位尺骨骨折和桡骨头脱位，在随访中应该关注尺骨畸形和桡骨头半脱位或者脱位的问题。
The ulnar fracture and radial head dislocation should be anatomical reduced. And the ulnar should be concerned about deformity and radial head about subluxation or dislocation during follow-up.
方法：2008年至2009年治疗2例桡骨头骨折合并下尺桡关节脱位患者，均为男性，年龄分别为56岁、66岁。
Methods: From 2008 to 2009, 2 male patients of radius head fractures complicating distal radioulnar joint dislocation were treated, the age was 56 and 66 years old respectively.
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