腰椎经椎间孔椎体间融合不对称内固定的生物力学稳定性实验研究

目的 比较腰椎完整标本和3种L3-4节段的经椎间孔椎体间融合(TLIF)内固定的生物力学稳定性.方法 采用成人新鲜腰椎标本7例,分别于L3-4节段完整状态、左侧TLID同侧椎弓根螺钉(PS)固定、左侧TLIF同侧PS+对侧经关节突椎弓根螺钉(TFPS)固定、左侧TLIF双侧PS固定下,测定10Nm扭矩时前屈/后伸、左/右侧弯及左/右轴向旋转等6种运动下运动范围(ROM)并进行比较.结果 在前屈、后伸及左、右侧弯等4种运动状态下,L<3-4>节段标本完整组ROM明显大于其他3种融合内固定组,均有显著性差异(P<0.05).左、右轴向旋转时,标本完整状态与TLIF同侧PS固定组角位移无显著性差异,明显大于另外2个内固定组,有显著差异(P<0.05).前屈、左侧弯和左旋时,TLIF同侧PS固定与PS+对侧TFPS固定组角位移有显著性差异(P<0.05);6种运动状态下TLIF同侧PS固定的ROM明显大于双侧PS同定组,均有显著性差异(p<0.05).而PS+对侧TFPS固定、双侧PS同定组间ROM均无明显差异.结论 TLIF同侧PS+对侧TFPS周定的稳定性与TLIF双侧PS固定相似,该种腰椎融合不对称内同定方式可作为微创手术治疗的优先备选方案.

Biomechanical evaluation of asymmetrical posterior internal fixation for transforaminal lumbar interbody fusion with transfacetopedicular screws

Objective To assess the biomechanical stability of asymmetrical posterior internal fixation for transforaminal lumbar interbody fusion (TLIF) with transfacetopedicular screws (TFPS). Methods Range of motion (ROM) testing was performed in 7 fresh-frozen human cadaveric lumbar spine motion segments in flexion/extension,lateral bending,and axial rotation using 10.0 Nm torques at the L3-4 motion segment. The sequential test configurations included intact motion segment,TLIF and ipsilateral pedicle screw (PS),TL...