前、后路手术对下段颈椎粘弹性的影响

The experimental studies on viscoelastic properties of middle and lower cervical spine.

目的 研究下段颈椎的粘弹性,并评估前路椎间盘切除植骨术与后路椎板成形术对其的影响。方法 对6例新鲜尸体颈段脊椎及手术后颈椎,在模拟生理状态下进行屈曲及伸展位的粘弹性研究。结果 得出在恒应力条件下应变—时间数据及曲线和在恒应变的条件下应力—时间数据及曲线。结论 颈椎有着极好的粘弹性,屈及伸的快速应力松弛敏感效应相似,但屈曲位的快速蠕变敏感效应比伸展位的大。椎板成形术及颈椎前路间盘切除植骨术都使颈椎的粘弹性降低,前路间盘切除植骨术的影响更大。

Objectives To study viscoelastic properties of middle and lower cervical spine, and evaluate the effects on viscoelastic properties by posterior laminoplasty or anterior diskectomy with spinal fusion (ASF) . Methods The dynamic viscoelastic responses in flexion and extension were studied with fresh human cervical spine specimens of 6 cadavers in vitro under intact and postoperative status respectively. Results The strain - time data and curves were obtained under constant stress status. Meanwhile, the stress - time data and curves were also obtained under constant strain status. Conclusion The middle and lower cervical spine exhibits more creeping effects in flexion than those in extension. Cervical spine has the similar behaviors of stress relaxation. Either laminoplasty or anterior discectomy with spinal fusion (ASF) reduces cervical viscoelastic effects but ASF is most significant.