改良AO外固定器的生物力学研究与临床构型选择

Biomechanical Study and Selection of Clinical Configuration of Modified AO Fixator

目的探讨怎样选择合理的临床构型，以提高外固定器的使用效能。方法对改良ＡＯ外固定器进行了５种构型的刚度、屈服点测试，检测指标为抗轴向压力、扭转力、前后弯曲力和侧方弯曲力。结果在综合指标方面，单杆单边式构型（ＨＦ１）最差，三角式构型（ＤＦ）较好，半环式构型（ＲＦ）最佳。双杆单边式构型（ＨＦ２）在抗轴向压力、前后弯曲力方面较突出，双边式构型（ＢＦ）在抗扭转力、侧方弯曲力方面较突出。结论ＨＦ２较好地结合了临床和机械性能，适合于大多数稳定与不稳定的胫骨骨折治疗；ＲＦ结构虽较复杂，但适合于各种类型的胫骨骨折治疗。

Aim To study how to select rational clinical configuration in order to enhance the efficiency of external fixation. Methods The rigidity and the load of yield of five configurations of the modified AO fixator were investigated on the characteristics such as axial compression, torsion, anterior posterior bending, and medial lateral bending. Results The single half frame (HF 1) was the worst, the delta frame (DF) was better, and the half ring frame (RF) was the best in over all performances with regard to rigidity. The double half frame (HF 2) was more superior to axial compression and anterior posterior bending with stiffness characteristics. The bilateral frame (BF) was more superior to torsion and medial lateral bending with stiffness characteristics. Conclusion HF 2 has better combination of clinical and mechanical features. It appears to be suitable for most stable and unstable tibial fractures. RF has more complex frame in configurations, however, it appears to be suitable for all kinds of tibial fractures, especially for the fracture besides joints.