保留颈椎后方韧带复合体颈椎管扩大成形术的生物力学研究

A biomechanic study on the laminoplasty of cervical spine retaining the posterior ligaments complex

目的 :研究保留颈椎后方韧带复合体椎板成形椎管扩大术的生物力学稳定性。方法 :选用 8具无损伤的新鲜人尸体颈椎标本 ,经分次处理分为 3组 :A组 ,剔除肌肉的正常颈椎 ;B组 ,保留颈椎后方韧带复合体颈椎板成形椎管扩大术颈椎标本 ;C组 ,切除韧带复合体颈椎板成形椎管扩大术颈椎标本。模拟人颈部生理活动 ,分次进行压缩试验、三点弯曲试验和扭转试验 ,测量 3组的力学指标。结果 :与A组相比 ,C组C5椎体前缘的应力显著增高 ,轴向刚度、弯曲刚度和扭转刚度均明显下降 (P <0 0 1) ;而B组上述各力学指标均优于C组 (P <0 0 1)。结论 :保留颈椎后方韧带复合体的椎板成形椎管扩大术 。

Objective:To study biomechanical stability of cervical spine laminoplasty retaining the posterior ligaments complex.Method:8 pieces of harmless specimen of fresh cervical vertebare C2～T1 were used to make compression,bending and torsion biomechanical experiment under three working conditions separately,namely specimens with muscle removed,specimens with posterior ligament preserved(impreoved group) and traditional model specimen.Result:The axis、bending and torsion stiffness of improved model are significantly better than that of the traditional model,while the strain of improved model specimen is significantly less than the traditional model.Conclusion:The biomechanical stability in the improved laminoplasty of cervical spine is significantly better than that of the traditional laminoplasty. Author′s address\ The First Affiliated Hospital of Dalian Medical University,Dalian,Liaoning,116021