【摘要】：背景:由于骨質(zhì)原因及結構特點導致椎弓根螺釘經(jīng)常出現(xiàn)把持力下降,從而發(fā)生松動、拔出,導致內(nèi)固定失敗,因此提高椎弓根螺釘?shù)姆�(wěn)定性顯得尤為重要。目的:檢測可注射骨水泥空心椎弓根螺釘椎弓根螺釘生物力學穩(wěn)定性,為優(yōu)化骨水泥使用量提供參考。方法:選取7具新鮮成人尸體T11-L4椎體標本共40個椎體,隨機分為可注射骨水泥空心椎弓根螺釘及DTPS TM椎弓根螺釘組,各20個,置釘后分別注入1,2,3,5 m L骨水泥,通過影像學觀察骨水泥彌散分布情況,并測得最大軸向拔出力進行比較。結果與結論:骨水泥用量為1-3 m L時,可注射骨水泥空心椎弓根螺釘組螺釘平均最大軸向拔出力顯著高于DTPS TM組(P0.05)。骨水泥用量為5 m L時,2組平均最大軸向拔出力差異無顯著性意義(P0.05)。可注射骨水泥空心椎弓根螺釘組的直線回歸方程為Y=25.269X+133.681(R2=0.837),DTPS TM椎弓根螺釘組的直線回歸方程為Y=32.039X+99.251(R2=0.936)。骨水泥用量在1-5 m L時,2組螺釘最大軸向拔出力與骨水泥量高度正相關(|R|0.8)。說明骨水泥強化椎弓根螺釘可顯著提高螺釘穩(wěn)定性,椎弓根螺釘最大軸向拔出力與骨水泥使用量呈高度正相關,可注射骨水泥空心椎弓根螺釘在達到滿意的內(nèi)固定強化效果同時,減少骨水泥使用量,降低了骨水泥泄漏風險,相比DTPS TM椎弓根螺釘更具有優(yōu)勢。
[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，

本文編號：2504289