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肱骨髁上骨折在儿童中发生率极高，克氏针交叉固定是最常选用的方法之一。如何使固定牢固便于早期功能锻炼、最大限度的减少骨骺损伤、又可避免神经血管损伤，交叉克氏针固定的角度及方向是治疗的关键所在。本文结合肱骨远端的解剖结构剖析克氏针的进针角度原理。“,”The supracondylar fracture of humerus is a common trauma in children. Treatment requires anatomic reduction, fixation, and the minimum requirements of epiphyseal injuries, and early functional exercise. Closed or open reduction and Kirschner wire fixation is an ideal choice. This paper describes the hospital 246 cases of supracondylar fracture of humerus, through good design Kirschner needle direction, a successful fixation. To avoid the repeated adjustment of Kirschner wire direction cause bone damage, can achieve the stable fixation, and avoid the aggravation of epiphyseal injury, while avoiding the occur ence of vascular and nerve injury. The principle to determine the Kirschner needle into the direction.