摘要
目的 对静力性交锁髓内钉的结构进行改良 ,探讨其动力交锁的性能与力学原理。方法 将带锁髓内钉远端的圆形锁孔改为长形锁孔 ,近端改为尾翼状自带锁设计 ,在粉碎、横断骨折模型上测量长形锁孔的动力加压作用、尾翼的抗短缩作用和防旋转能力 ,并与静力性带锁髓内钉固定比较。 结果 动力性固定组骨折断端加压力为 3 5 93 .4～ 5 712 .3N ,静力性固定组为2 6 71.9～ 2 995 .2N(P <0 .0 1) ;动力性固定消除了髓钉与锁钉间的剪力 ,有效防止了断钉 ,并消除了骨折端的应力遮挡 ;齿状尾翼的防旋转能力可达 11.3Nm ,抗短缩剪力为 2 474.5～ 2 936 .2N。 结论 改良髓内钉起到了动力固定的加压效果和静力固定的轴向稳定性作用。
Objective To improve the construction of static locked intramedullary nailing and discuss its performance and mechanical principle. Methods The round hole of locked intramedullary nailing changed to dolichomorphic pore and its proximal hole to tail wing shape with self-locking device. The dynamic compression action of the dolichomorphic pore, the anti-contraction function and the anti-rotation ability of the tail wing were measured in the model of comminuted and intersectioned fractures and compared with static fixation. Results The compression was 3 593.4-5 712.3 N in the fragments in dynamic fixation group, but 2 671.9-2 995.2 N in the static fixation group (P<0.01). Dynamic fixation eliminated the shear force between intramedullary nail and locked nail, prevented the nail from breaking and diminished the stress block between the fragments. The torque of dentate tail wing could reach 11.3 Nm and the anti-contraction shear 2 474.5～ 2 936.2 N. Conclusions The improved locked intramedullary nailing exerts its compression action of dynamic fixation and axial stabilizing action of static fixation.
出处
《中华创伤杂志》
CAS
CSCD
北大核心
2003年第4期235-237,共3页
Chinese Journal of Trauma
