骨水泥加固椎弓根螺钉的生物力学特性
发布时间：2019-06-21 19:11
【摘要】：背景:由于骨质原因及结构特点导致椎弓根螺钉经常出现把持力下降,从而发生松动、拔出,导致内固定失败,因此提高椎弓根螺钉的稳定性显得尤为重要。目的:检测可注射骨水泥空心椎弓根螺钉椎弓根螺钉生物力学稳定性,为优化骨水泥使用量提供参考。方法:选取7具新鲜成人尸体T11-L4椎体标本共40个椎体,随机分为可注射骨水泥空心椎弓根螺钉及DTPS TM椎弓根螺钉组,各20个,置钉后分别注入1,2,3,5 m L骨水泥,通过影像学观察骨水泥弥散分布情况,并测得最大轴向拔出力进行比较。结果与结论:骨水泥用量为1-3 m L时,可注射骨水泥空心椎弓根螺钉组螺钉平均最大轴向拔出力显著高于DTPS TM组(P0.05)。骨水泥用量为5 m L时,2组平均最大轴向拔出力差异无显著性意义(P0.05)。可注射骨水泥空心椎弓根螺钉组的直线回归方程为Y=25.269X+133.681(R2=0.837),DTPS TM椎弓根螺钉组的直线回归方程为Y=32.039X+99.251(R2=0.936)。骨水泥用量在1-5 m L时,2组螺钉最大轴向拔出力与骨水泥量高度正相关(|R|0.8)。说明骨水泥强化椎弓根螺钉可显著提高螺钉稳定性,椎弓根螺钉最大轴向拔出力与骨水泥使用量呈高度正相关,可注射骨水泥空心椎弓根螺钉在达到满意的内固定强化效果同时,减少骨水泥使用量,降低了骨水泥泄漏风险,相比DTPS TM椎弓根螺钉更具有优势。
[Abstract]:Background: due to bone causes and structural characteristics, pedicle screws often decrease the holding force, resulting in loosening and pulling out, resulting in the failure of internal fixation, so it is particularly important to improve the stability of pedicle screws. Objective: to detect the biomechanical stability of injectable bone cement hollow pedicle screw and to provide reference for optimizing the amount of bone cement. Methods: 40 vertebrae of 7 fresh adult cadaveric T11-L4 vertebrae were randomly divided into injectable cement hollow pedicle screw group (20 vertebrae) and DTPS TM pedicle screw group (20 vertebrae). The bone cement was injected with 1, 2, 3 and 5 mL bone cement respectively. the diffusion distribution of bone cement was observed by imaging, and the maximum axial pullout force was measured. Results and conclusion: when the dosage of bone cement was 1 鈮，
本文编号：2504289
[Abstract]:Background: due to bone causes and structural characteristics, pedicle screws often decrease the holding force, resulting in loosening and pulling out, resulting in the failure of internal fixation, so it is particularly important to improve the stability of pedicle screws. Objective: to detect the biomechanical stability of injectable bone cement hollow pedicle screw and to provide reference for optimizing the amount of bone cement. Methods: 40 vertebrae of 7 fresh adult cadaveric T11-L4 vertebrae were randomly divided into injectable cement hollow pedicle screw group (20 vertebrae) and DTPS TM pedicle screw group (20 vertebrae). The bone cement was injected with 1, 2, 3 and 5 mL bone cement respectively. the diffusion distribution of bone cement was observed by imaging, and the maximum axial pullout force was measured. Results and conclusion: when the dosage of bone cement was 1 鈮，
本文编号：2504289
本文链接：https://www.wllwen.com/yixuelunwen/swyx/2504289.html
