分叉交锁髓内钉和其它三种内固定器材治疗肱骨骨折的生物力学比较研究

目的　对分叉交锁髓内钉 (BLIN)内固定肱骨骨折的生物力学性能进行实验研究 ,为临床应用提供可靠的理论依据。方法　采用 18根湿润新鲜肱骨标本进行实验 ,比较分叉交锁髓内钉与其它三种内固定物固定之肱骨骨折在抗轴向拉伸及压缩、抗弯曲、抗扭转的强度和刚度等方面的差异性。结果　在拉伸和压缩试验中 ,BLIN固定之肱骨骨折具有近于两端均行横向交锁之髓内钉 (TLIN)的相对高的破坏载荷 ,而刚度相对较低 ;BLIN的抗扭转、抗弯曲性能强于 6孔加压钢板 (6TCP)。三根Ender钉内固定 (E3)各项生物力学性能均为最差。结论　BLIN属坚强内固定和弹性动态固定的有机组合 ,应力遮挡率低 ,有利于术后早期活动和骨折愈合。

A Comparative Biomechanical Study of Branch Locking Intramedullary Nail and Three Kinds of Other Internal Fixation Devices in Treatment of Humeral Fractures

Objective Humeral fractures fixed by branch locking intramedullary nails(BLIN)were tested for the sake of understanding their biomechanical function,so as to provided the theoretical basis for clinical practice Methods The intensity and rigidity of humeral fracture fixed by the BLIN was compared with that of fracture fixed by three kinds of other internal fixations in pull test,compress test,bend and torsion test In the expariment,18 pieces of moist fresh humeri were used Results In pull and compress test,the high level of break load of BLIN was close to that of both-ends transverse-interlocking intramedullary nail(TLIN) But the rigidity of BLIN was lower The force of anti-torsion and anti-bend of BLIN was more powerful than that of 6TCP The biomechanical function of three Ender nails(E3) was the poorest Conclusion With the lower stress-shelter rate,BLIN is a kind of organic combination which is characteristic of strong and elastic dynamic fixational function It is beneficial to early exercise and fracture healing after operation