一种新型颈前路钢板的三维稳定性生物力学评价

CERVICAL SPINE BUTTERFLY PLATE FOR UNSTABLE CERVICAL SPINE:A BIOMECHANICAL EVALUATION IN VITRO

目的:对利用颈前路蝶型钢板(CSBP)进行固定的颈椎标本进行三维稳定性分析,进而对颈前路蝶型钢板(CSBP)作出生物力学评价。方法:14具颈椎标本随机分为A、B两组,测量两组正常颈椎在2.0Nm载荷下的运动范围(ROM);将两组颈椎制作成三柱不稳定模型,分别以CS-BP和Orion钢板固定。测量两组颈椎的ROM。结果:CSBP和Orion钢板均能显著降低颈椎各方向上的ROM(P<0.05),在前屈、后伸方向最大。应用CSBP钢板,前屈、后伸ROM较正常颈椎分别降低66%、60%;应用Orion钢板分别降低72%、71%;两种钢板在重建颈椎稳定程度上无明显差异(P>0.05)。结论:CSBP的生物力学稳定作用较好。

Objective:To evaluate the biomechanical stability of a cervical spine butterfly plate(CSBP)for unstable cervical spine.Method:Fourteen cervical spine specimens(C3～T1)were divided into two group:A and B.All intact,specimens were subjected to nondestructive testing in6loading modalities on a universal testing machine.A cadaveric model of complete C5～C6instability was produced in both groups.Specimens in group A were stabi -lized with CSBPs,and group B with Orion plates.The nondestructive testing was repeated to determine structural stability.Results:The injured spines stabilized with implants in both groups were significantly more stable than the intact specimens in all modes of testing(P<0.05).Stability of injured spines was increased most in flexion-extension,66%in flexion and60%in extension by CSBP while72%in flexion and71%in extension by Orion plate.The two constructs provided similar stability in6loading modalities(P>0.05).Conclusion:This study shows that CSBP provides biomechanical stability for unstable cervical spine.