经皮置入式腰椎棘突间撑开器的生物力学测试

被引:9
作者
张加芳 [1 ]
郑召民 [1 ]
张奎渤 [1 ]
刘辉 [1 ]
吕维加 [2 ]
胡勇 [2 ]
Larry Khoo [3 ]
机构
[1] 中山大学附属第一医院脊柱外科
[2] 香港大学医学院
[3] UCLA Medical Center and Orthopaedic Hospital
关键词
腰椎; 置入式棘突间撑开器; 经皮; 生物力学;
D O I
暂无
中图分类号
R687.3 [骨骼手术];
学科分类号
100220 [骨科学];
摘要
目的:评价经皮置入式腰椎棘突间撑开器对置入节段及其邻近节段活动度的影响。方法:选取6具新鲜人体腰椎标本(L1~L5),剔除附着肌肉,保留各韧带及骨骼,将标本的头尾端固定在MTS生物力学试验测试机上,对标本施加400N的轴向压力,然后以0.5°/s速度施加六个方向(前屈/后伸、左右侧屈、左右轴向旋转)±7.5Nm的力矩,测量L2/3、L3/4节段各个运动方向的运动范围(ROM,完整状态组);于L3/4节段置入Bullet棘突间撑开器,按照同样方法测试标本各个方向的活动度(置入撑开器组)。测试后以2Hz频率循环加载,屈伸20 000次、侧屈15 000次、旋转5 000次,摄X线片观察内置物位置及棘突有无骨折,肉眼观察内置物有无变形和破损。结果:L3/4节段完整状态下前屈和后伸的平均ROM值分别为4.62°±2.26°和4.07°±1.92°,置入撑开器后前屈和后伸的平均ROM值分别为3.87°±2.06°和2.57°±2.06°,两组比较差异有统计学意义(P<0.05);两组侧方屈曲和旋转的平均ROM值差异均无统计学意义。在完整状态和置入撑开器后L2/3节段各个运动方向的平均ROM值差异均无统计学意义。循环加载至预定加载次数后X线片示撑开器无移位,棘突无骨折;未发现棘突撑开装置变形或出现裂缝。结论:经皮置入式棘突间撑开器能够使置入节段前屈和后伸的活动度明显减少,但轴向旋转和侧向弯曲不受影响,且对邻近上位节段的活动度无影响。
引用
收藏
页码:129 / 132
页数:4
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