摘要
目的 :测试并评价记忆合金椎间融合器的拔出强度。方法 :12具新鲜尸体腰椎标本 ,分为记忆合金椎间融合器组 (SMAcage)、螺纹状椎间融合器组 (Interfix)、方形融合器组 (Prospace)。每组测试 4个L3、4节段的双侧共 8枚融合器的拔出强度。结果 :SAMcage、Interfix和Prospace的最大拔出强度为 (75 0± 2 0 5 )N、 (695± 175 )N和 (2 5 8± 65 )N。SMAcage的拔出强度与Interfix相比无统计学差异 (P =0 2 4) ;但明显高于Prospace (P =0 0 17)。根据不同拔出曲线求得的拔出斜率分别为 (2 19 7± 49)N/mm (SMAcage)、 (195 6± 75 )N/mm (Interfix)、 (5 0 4± 2 4)N /mm (Prospace)。SMAcage和Interfix之间差别不显著 (P =0 5 9) ;与Prospace则有统计学差异 (P =0 0 2 5 )。结论 :SMAcage在用于测试的 3种融合器中具有最佳的抗拔出性能。
Objective:To test the pullout strength of a newly designed shape memory alloy lumbar interbody fusion cage and compare with that of threaded cage and rectangular cage.Method:Twelve cadaver lumbar segments (L 3、4 ) were harvested to evaluate pullout strength.They were divided into three groups:(1)SMAcage,(2)Cylindrical threaded cage (Interfix,SOFAMOR-DANEK),(3)rectangular cage with ridges on its surface (Prospace,AESCULAP).Each specimen had 2 cages inserted from both sides.Different cages were tested by a biomechanical test machine(MTS858 Mini Bionix).Result:The SMAcages required a median pullout force of (750±205)N,as compared with the lower pullout force of the Interfix (695±175)N,and the Prospace (258±65)N.There were no statistical difference between SMAcage and Interfix ( P=0.24 ).Significant difference was observed between SMAcage and Prospace ( P=0.017 ).The pullout curves of three cages had their own unique characteristic.The slope of each curves were (219.7±49)N/mm (SMAcage)、(195.6±75)N/mm (Interfix)、(50.4±24)N/mm(Prospace),there were no significant difference between SMAcage and Interfix( P=0.59 ),but a statistical difference between SMAcage and Prospace ( P=0.025 ).Conclusion:The newly designed shape memory alloy cage shows highest pullout resistance among the three types of cages because of its anchorage device at the upper and lower surface.
出处
《中国矫形外科杂志》
CAS
CSCD
2004年第7期534-536,共3页
Orthopedic Journal of China
关键词
椎间融合器
腰椎
记忆合金
拔出强度
Interbody fusion cage
Lumbar spine
Shape memory alloy
Pullout strength
