两种新型交锁髓内钉的抗扭生物力学性能测定

目的 探讨两种新型交锁髓内钉的抗扭生物力学性能，为临床应用提供依据。方法 采集固定湿润成年尸体股骨四具标本，进行实验应力分析，对股骨干骨折两种新型交锁髓内钉固定的抗扭生物力学性能进行测定，并与传统的梅花针内固定进行对照比较。结果 膨胀螺丝型自锁髓内钉抗扭转强度和刚度，分别达到梅花针的2倍和1.6倍，偏心插销锁定带锁髓内钉抗扭转强度和刚度，分别达到梅花针的1.6倍和1.5倍，但仅为完整骨的30％。结论 两种新型交锁髓内钉都能满足生物力学要求，因而适用于临床上股骨干峡部或峡中以外的稳定或不稳定性骨折。

DETERMINATION OF THE ANTI-TWISTING BIOMECHANICAL PROPERTIES OF TWO NEW-TYPE INTERLOCKING INTRAMEDULLARY PIN

Objective To study the anti-twisting biomechanical properties of two new type interlocking intramedullary pin so as to provide some scientific theory for clinical application. Methods To collect four fixed damp femurs of adult cadaver , and engaged in experimental stress analysis. The anti-twisting biomechanical properties of two new type interlocking intramedullary pins fixed into the fractured shaft of femur were determined and compared them with those of Plum Blossom Nail. Results The tests of biomechanics indicated that the anti-twisting intensity and rigidity of Expansive Screw Type self-locked intramedullary pin are 2 times and 1.6 times of those of the Plum Blossom Nail, while those of Partiality Bolt Locked interlocking intramedullary pin are 1.6 times and 1.5 times compared with the Plum Blossom Nail. but only the 30% of those of integrity bone.Conclusion Both two new type interlocking intramedullary pins can gratify the demand of biomechanics. So they can serve stable or unstable fracture in the isthmus or excluding isthmus of shaft of femur.