Hernigou P, Duparc F
Hôpital Henri Mondor, University Paris XII, Creteil, France.
J Spinal Disord. 1996 Aug;9(4):322-5.
This study analyzed the use of a rib graft or cement to enhance the holding power of a screw in a vertebral body. The results were correlated to provide a rationale for surgically enhancing the holding power of a screw when stripping of the bone thread has occurred. Human lumbar vertebral bodies obtained at autopsy were used in this study. The screws were inserted at three different sites of each vertebra and a load necessary to strip the thread was applied. Then costal fixation and cement fixation were tested to determine whether it was possible to restore the ability of the screw to withstand pullout load in the same hole. The main finding was that methacrylate placement or costal fixation restored the ability of the screw to withstand pullout load to within 5% (cement) or 15% (rib graft) of the original value. These results validate the possibility of using a rib graft or cement to enhance screw fixation.
本研究分析了使用肋骨移植或骨水泥来增强螺钉在椎体中的把持力。对结果进行关联分析，以便为在出现骨螺纹剥离时通过手术增强螺钉把持力提供理论依据。本研究使用了尸检获取的人类腰椎椎体。在每个椎体的三个不同部位插入螺钉，并施加使螺纹剥离所需的负荷。然后测试肋骨固定和骨水泥固定，以确定是否有可能恢复螺钉在同一孔中承受拔出负荷的能力。主要发现是，放置甲基丙烯酸酯或肋骨固定可将螺钉承受拔出负荷的能力恢复到原始值的5%（骨水泥）或15%（肋骨移植）以内。这些结果证实了使用肋骨移植或骨水泥来增强螺钉固定的可能性。
