学龄儿童常常喜欢爬高上梯,例如爬树、爬竿和爬墙等。如不慎跌下,在手撑地面时,反作用力传到肘部就会引起肘关节后脱位。这时肘部可立即肿胀,呈“白薯”形,胳膊呈微屈曲状,约为150°左右,不能伸直,也不会打弯,手指够不着嘴,关节活动失灵,稍动即疼。肘关节主要是由上臂的肱骨下端与前臂的尺骨上端相接触组成的。肱骨下端扁园形称为肱骨滑车, School-aged children often like to climb high and climb the ladder, such as climbing trees, climbing poles and climbing walls. If you accidentally fall, hand in the ground, the reaction force reached the elbow will cause dislocation of the elbow. Then the elbow immediately swollen, was “sweet potato ” shape, the arm was slightly buckled shape, about 150 ° or so, can not be straight, it will not bend, fingers not mouth, joint activity failure, pain. The elbow is mainly composed of the lower arm of the upper arm and the upper arm of the ulna in contact with the composition of the ulna. Flat under the humerus shaped garden called humeral pulley,