目的 对比二钉棒与三钉棒的生物力学特性，研究骨盆微创手术中不同钉棒固定位置的力学效果差异。方法 建立了二钉棒及三钉棒固定物植入后的骨盆力学模型，并通过有限元仿真对其双腿站立、健侧单腿站立、患侧单腿站立、坐姿下的生物力学特性进行对比分析，并通过临床实验验证三钉棒固定效果。结果 两种固定方式均能够恢复骨盆力学传递，但三钉棒固定后单侧站立时骨盆两侧应力更均衡，整体及断裂面处位移也更低。结论 三钉棒固定在稳定性方面的优异效果，更有利于骨折恢复。
Objective: To compare the biomechanical properties of two screw rod and three screw rod, and to study the difference of mechanical effects of different screw rod fixation positions in pelvic minimally invasive surgery. Methods: the mechanical model of pelvis after two or three screw rod fixation was established, and the biomechanical characteristics of the pelvis in the two leg standing, healthy side single leg standing, affected side single leg standing and sitting posture were compared and analyzed by finite element simulation, and the fixation effect of three screw rod was verified by clinical experiments. Results: the two fixation methods can restore the pelvic mechanical transmission, but the stress on both sides of the pelvis is more balanced, and the displacement of the whole body and fracture surface is also lower when the three screw rod fixation is used for unilateral standing. Conclusion: three screw rod fixation has excellent effect in stability, which is more conducive to fracture recovery.