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

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 ARRIF, 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=107～1 253,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.

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

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.