空心螺钉治疗锁骨骨折的生物力学研究

目的检测直径6.5 mm空心螺钉固定锁骨骨折的生物力学性能,并与钢板螺钉内固定方法进行比较,为临床应用提供依据。方法采集10个成人锁骨标本,行中外1/3处锁骨横形骨折模型,随机分二组,分别采用空心螺钉和钢板螺钉内固定,测试各组的三点弯曲应变及轴向挤压效应。结果轴向挤压实验：载荷1571 N时,钢板固定组螺钉发生松动,在载荷2470.13 N时钢板固定失败,而锁骨空心螺钉固定失败载荷为3034.99 N,两者相差明显。三点弯曲实验：无论钢板组的正向（270.29-254.38 N）或负向加压负荷（425.85-443.76 N）结果均远远小于空心螺钉组（1017.16-1103.39 N）。结论直径6.5 mm空心螺钉治疗锁骨骨折从生物力学上来看,在抗轴向负荷及三点弯曲负荷上均优于目前常规使用的钢板螺钉。

Biomechanical study on clavicular fracture for cannulated screw

0bjective To evaluate the biomechanical characteristies of cannulated screw with 6.5 mm diameter for treatment of clavicular fracture and compare the effect with steel plate internal fixation. Methods Ten adult clavicles were prepared models for the middle and lateral fractures and divided into two groups randomly. Two groups were fixed with cannulated screw and steel plate. The biomechanieal test was performed and the stress was analyzed. Results Axial compression test： In the load 1571. 18 N,steel plate fixation group screw loose. In the load 2470. 13 N,the fixation was failure. And fixation group with 6. 5 mm diameter cannulated screw was failure in the load of 3034. 99 N. There was significantly different between two groups. Three point bending test： Either forward or reverse pressure load results in steel group（ 270. 29- 254. 38 N; 425. 85- 443. 76 N） were far less than the cannulated screw group（ 1017. 16- 1103. 39N）. Conclusion Biomechanical study on clavicular fracture for 6. 5 mm diameter cannulated screw shows： Either on the axial load and three point bending load in cannulated screw is superior to steel plate.