摘要
目的 :对胸腰椎前路K形钢板内固定系统 (K plate)进行生物力学稳定性评价。方法 :6例新鲜成人尸体胸腰椎 (T11～L3 )标本 ,制成前、中柱损伤模型 ,椎体间模拟植骨后 ,分别以Z plate、K plate固定 ,采用脊柱三维运动试验系统测试完整、损伤、Z plate和K plate等 4种状态下脊柱节段的运动范围 (ROM)。结果 :K plate固定后 ,前屈、后伸、左侧弯、右侧弯运动方向上ROM与完整、损伤状态之间差异有显著性 (P<0 .0 5 ) ;左、右轴向旋转运动方向上ROM与损伤状态之间差异有显著性 (P <0 .0 5 ) ,但与完整状态之间差异无显著性 (P >0 .0 5 )。Z plate、K plate固定状态之间 6个运动方向上ROM差异均无显著性 (P >0 .0 5 )。结论
Objective: To evaluate the biomechanical stability of an anterior thoracolumbar K plate fixation system for unstable human cadaveric spine. Methods: Six fresh thoracolumbar spines (T 11 L 3) were used in this study. After instability created from injury of anterior and middle columns in all six specimens, Z plate (Sofamor Danek Co.) and K plate, combined with interbody grafting, were used to reconstruct the unstable segments respectively. Using a three dimensional motion measurement system, the ranges of motion (ROM) were obtained in each specimen under four different testing states including intact, injured spine, Z plate fixation and K plate fixation. Results: The ROM after K plate fixation showed significantly less than that of intact or injured spine ( P <0.05) in flexion, extension, lateral bending, and injured spine in axial rotation ( P <0.05). K plate fixation provided similar stability with intact specimen in axial rotation. No statistical differences of ROM in all six motions were found between K plate and Z plate ( P > 0.05) . Conclusion: The present study supports that this K plate fixation system can effectively restore biomechanical stability for unstable thoracolumbar spine.
出处
《中国临床解剖学杂志》
CSCD
北大核心
2002年第4期306-307,共2页
Chinese Journal of Clinical Anatomy
基金
军队"十五"指令性项目分题广东省火炬计划重点项目(C 1 1 0 2 2 )
