钛质网笼内植物加前路带锁钢板对颈椎稳定性的生物力学评价

A biomechanical evaluation of the cervical locking plate for the titanium mesh cage system

目的 :评价颈椎在植入颈椎钛质网笼内植物和植入钛质网笼内植物辅助AO前路带锁钢板内固定两者的生物力学稳定性。方法 :测量 6例新鲜人颈椎骨骼韧带标本 (C2～T1)在正常、C5椎体次全切除减压后植钛质网笼内植物、植钛质网笼内植物后辅助AO前路带锁钢板内固定三种工况下C4～C6节段的三维运动数据 ,并做统计学处理。结果 :6例颈椎标本C4～C6节段在正常、植钛质网笼内植物、植钛质网笼内植物加AO前路钢板三种工况下 ,前屈 /后伸、左 /右侧弯、左 /右轴向旋转的运动范围 (ROM )平均值 (°)分别为 :14 12 /12 94、13 39/13 11、9 77/10 72 ;9 70 /14 4 2、8 94/8 6 1、7 6 5 /8 0 9和 4 39/1 36、4 0 8/4 19、3 4 6 /3 6 3。结论 :颈椎减压、植入钛质网笼后在后伸运动时的稳定性明显不足 ;辅助AO前路带锁钢板内固定后在各个方向的稳定性都显著增强 ,可满足临床应用的要求。

Objective:To evaluate the mechanical stability of cervical model with titanium mesh cage-graft and the construction combined with AO cervical spine locking plate.Method:6 fresh cadaver cervical specimens (from C2～T1) were collected.The three-dimension motion of C4～C6 segment were measured on a spinal three-dimensional motion test machine under the conditions of normal,titanium mesh cage-graft and titanium mesh cage-graft combined with AO cervical spine locking plate.Result:The range of motion (ROM) during flexion/extension,left/right bending and left/right axial rotation under normal,titanium mesh cage-graft and titanium mesh cage-graft combined with anterior plate implantation were respectively 14 12/12 94,13 39/13 11,9 77/10 72;9 70/14 42,8 94/8 61,7 65/8 09 and 4 96/1 93,4 56/4 66,3 93/4 10.Conclusion:Compared with normal condition,the stability of cervical model under titanium mesh cage-graft condition are improved significantly during flexion,left/right bending,left/right axial rotation,but is reduced during extension.With the combination of AO cervical spine locking plate,the stability of cervical model in all motional direction were improved obviously,and can meet the demand of clinical application.