新型动力型Hoffmann外固定器的生物力学研究

目的　评价新型动力型Hoffmann外固定器在生物力学上的优缺点,为临床应用提供参考。方法　以人离体胫骨中部短斜行骨折行新型动力型Hoffmann外固定器、改良型Hoffmann外固定器、多功能外固定器固定为实验模型,通过电测法观测三种外固定器固定的强度、刚度、稳定性及应力遮挡率变化。结果　新型动力型Hoffmann外固定器和改良型Hoffmann外固定器在强度、刚度和稳定性上无显著差异(P >0 .0 5 ) ,与多功能外固定器有显著差异(P <0 .0 5 ) ,应力遮挡率均有极显著差异(P <0 .0 1) ,新型动力型Hoffmann外固定器明显优于其他方法。结论　新型动力型Hoffmann外固定器具有较大的生物力学优越性。

The Biomechanics Study for New Dynamic Hoffmann External Fixation

Objective To evaluate the superiority of new dynamic Hoffmann external fixation in tibial fractures and to direct the clinical practice. Methods After the oblique fracture in the mid part of human tibia was fixed with new dynamic, modified Hoffmann external fixation and versatile external fixation, changes in the bone intensity, strength, stability and stress-protecting rate of fixation under different loads were determined with electrometric method. Results The strength and stability of new dynamic external fixation had no significant difference with improve external fixation, and had significant difference with versatile external fixation, new dynamic external fixation was more superior than the two others. Conclusion The biomechanical virtues of new dynamic Hoffmann external fixation are obviously.