【摘要】 为了解组合式外固定器在治疗稳定性股骨干骨折时固定器 -骨复合系统的力学特性 ,用电子万能试验机对成人新鲜尸体股骨以及骨 -组合式外固定器构成的完整股骨加组合式外固定器和模拟股骨干中段横骨折加组合式外固定器等3种构型进行压缩试验 ,测定系统的应变分布、刚度等生物力学特性 ,并对3种构型加以对比。结果表明 :骨 -固定器复合系统的刚度明显强于骨材料本身 ,且应变分布更均匀。稳定固定时 ,股骨受力仍然主要沿骨干方向传递 ,固定器本身应力遮挡较小 ,可为骨折愈合提供良好的力学环境更多还原

【Abstract】 Four configurations of Combinable External Fixation(CEF) devices used for curing of fracture femur with the fracture gap cross the middle of the femur were tested to determine their biomechanical feature, such as the strain distribution of the femur-Fixator compound systems, the fixator stiffness. There were some differences between configurations of CEF in all modes of loading with respect to strain-distribution and stiffness. It is proved that the stiffness of the femur with CEF is stronger than that of intact femur. And the strain-distribution of the femur with CEF is also smoother than that of femur without CEF. In the stable fixation, because the load still go through the diaphysis, the CEF has a little stress shielding. And so the CEF can provide a better condition of the new bone formation. These data may be useful in developing the CEF for a particular clinical situation.更多还原