小儿桡骨小头位于肘关节。幼儿时期,骨骼发育还不健全,尤其是四岁以下幼儿,由于桡骨头尚未发育完全,仅靠一条环状韧带将其与相邻的尺骨包绕。如果幼儿的手臂被牵拉过度,桡骨小头就会从环状韧带脱出,脱位就发生了。笔者在工作中曾遇见过多起小儿桡骨小头半脱位的病例,有的是幼儿自己洗手后双手使劲甩水引起;有的是家长替孩子脱衣服 Pediatric radial head is located in the elbow. Early childhood, skeletal development is not perfect, especially in children under the age of four, because the radial head has not yet fully developed, only by an annular ligament will be surrounded by the adjacent ulna. If the child’s arm is pulled over, the radial head will emerge from the annuloplasty, dislocation took place. I had met in the work of many cases of radial head subluxation in children, and some children wash their hands after their own hard water thrown; some parents take off their clothes for children