抗旋转复位内固定器与4种经椎弓根内固定器的生物力学差异比较(英文)

Comparison of biomechanical difference between anti-rotation reduction internal fixators and other four kinds of internal fixators through pedicle of vertebral arch

目的:观察抗旋转复位内固定器与其他4种经椎弓根内固定器的生物力学差异,为临床应用获取实验依据。方法:10具新鲜健康成人T11～L3脊柱标本,分为5组,分别使用AR-RIF,AF,RF,Dick钉、Steffee钢板在屈曲压缩骨折模型、屈曲牵张型损伤模型上测试内固定器的抗压缩、抗屈伸、抗侧弯、抗旋转能力。结果:ARRIF,AF,RF抗轴压较强(F=373,P<0.01),ARRIF,AF抗屈伸较强(F=244,440;P<0.01),ARRIF,AF,Steffee钢板抗侧弯能力较强(F=436,P<0.01),ARRIF,RF,Steffee钢板抗扭转能力较强(F=107～1253,P<0.01)。结论:ARRIF在不同脊柱骨折模型中具有确实的三维固定作用,其他经椎弓根内固定器以AF,RF三维固定作用较为确实。

AIM:To observe the biomechanical difference between anti rotational reduction internal fixator(ARRIF) and other four kinds of internal fixators through pedicle of vertebral arch and provide experimental data for clinical application. METHODS:Ten fresh specimens of healthy adult spine(T11-L3) were divided into five groups in which ARRIF,AF,RF,Dick screw and Steffee steel board were applied respectively to test the capacity of internal fixators of anti compression,anti flexion extension,anti lateral bending and anti rotation on the flexion compression fracture model and the flexion extension damaged fracture model. RESULTS:ARRIF,AF and RF have a better anti longitudinal pressure capacity(F=373,P< 0.01).ARRIF and AF have a better anti flexion extension capacity(F=244,440;P< 0.01). ARRIF,AF and Steffee steel board have a better anti lateral bending capacity(F=436,P< 0.01). ARRIF,AF and Steffee plate have a better anti rotation capacity(F=107-1253,P< 0.01). CONCLUSION:ARRIF has a valid triaxial fixation effect in different spinal fracture.AF and RF have a better fixation effect in the other four kinds of internal fixators through pedicle of vertebral arch.