An unpaired t test showed that fatigued pedicle screws in osteoporotic ertebrae augmented by kyphoplasty showed higher pullout resistance than those placed in healthy control ertebrae (P = 0.002).

• 一个未配对试验显示，在骨质疏松椎体使用后凸成形技术强化的螺钉在退出时教之健康对照椎体有更大的阻力(P=0.；002)。