首页 | 本学科首页   官方微博 | 高级检索  
检索        

髓内持骨动力性髓内钉的生物力学研究
引用本文:王国栋,彭新生,王军,潘滔.髓内持骨动力性髓内钉的生物力学研究[J].中国修复重建外科杂志,2008,22(6):703-706.
作者姓名:王国栋  彭新生  王军  潘滔
基金项目:广东省科技厅科技计划 , 广东省广州市科技计划
摘    要:目的 对新型的髓内持骨动力性髓内钉(intramedullary controlled dynamic nailing,ICDN),进行生物力学测试和分析.方法 10对成年男性股骨标本,年龄18~55岁.标本长度为(438±10)mm,外径(26.4±1.5)mm.按完整股骨标本左右侧随机分为A1组和Bl组(n=10);完整股骨行生物力学测量后,进行骨折模型制备,ICON随机固定一侧标本(A2组),对应另一侧用GK钉固定作为对照(B2组).将各组标本分别安装在MTS858实验机上,进行轴向压缩、4点弯曲和扭转实验;在人工骨骨折端间植入贴有应变片铁环,使铁环的上下两端与骨折端密切接触,分别植入ICDN和GK钉进行固定,利用应变仪测定两种骨.植入物复合体断端间的压力.结果 承受轴向压缩负荷时,A1、B1、A2、B2组的抗压缩刚度分别为(0.19 ±0.18)x 106、(0.22±0.12)x106、(1.67±0.68)×106和(0.86±0.32)×106N/mm,A2组和B2组比较差异有统计学意义(P<0.01).冠状面抗弯刚度:A1、B1、A2、B2组分别为(0.944±0.25)×106、(1.104±0.21)×103、(0.704±0.22)×103和(0.644±0.21)×103N/mm;矢状面抗弯刚度:分别为(1.064±0.26)×103、(0.96±0.25)×103、(0.674±0.25)x 103和(0.61±0.18)x 103 N/mm;A1组与B1组间及A2组与B2组间差异均无统计学意义P>0.05).当扭矩是5 Nm时,A1、B1、A2、B2组抗扭转刚度分别为(4.00±2.54)、(4.76±1.93)、(0.50±0.63)和(0.35±0.31)Nm/°;当扭矩是8 Nm时,抗扭转刚度分别为(4.30±3.27)、(3.94±2.01)、(0.42±0.52)和(0.36±0.18)Nm/°;两种情况下,A1与A2组及B1与B2组间差异有统计学意义(P<0.05),A2组与B2组间差异无统计学意义P>0.05).ICON撑开的过程中骨折端间的压力为21.6 N,GK钉锁定后未测出骨折端问压力.结论 ICDN是一种弹性固定结合坚强固定的混合固定材料,可能成为将来骨折内固定的发展方向.

关 键 词:股骨骨折  髓内钉  生物力学  内固定  髓内钉  动力性  生物力学研究  DYNAMIC  CONTROLLED  INTRAMEDULLARY  方向  发展  骨折内固定  固定材料  混合  结合  弹性固定  过程  情况  抗扭转刚度  扭矩  组间差异  矢状面  组分
修稿时间:2007年8月30日

BIOMECHANICAL TEST OF INTRAMEDULLARY CONTROLLED DYNAMIC NAILING
WANG Guodon,PENG Xinshen,WANG Jun,PAN Tao.BIOMECHANICAL TEST OF INTRAMEDULLARY CONTROLLED DYNAMIC NAILING[J].Chinese Journal of Reparative and Reconstructive Surgery,2008,22(6):703-706.
Authors:WANG Guodon  PENG Xinshen  WANG Jun  PAN Tao
Institution:Department of Orthopaedics, the Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou Guangdong, 510655, P.R.China.
Abstract:OBJECTIVE: To explore the biomechanical properties of a new intramedullary controlled dynamic nailing (ICDN). METHODS: Ten pairs of specimens of adult femurs, with the age of 18 to 55 years, were divided into two groups (groups Al and B2, n = 10). The length of the specimens was (438 +/- 10) mm , and the external diameter was (26.4 +/- 1.5) mm. The specimens of the two groups were osteotomized transversely after the biomechanical test. ICDNs and GK nails were randomly implanted into the femurs, respectively (groups A2 and B2). Torsional, bending and axial compressive tests were made in each group, and the effect of dynamic compression between the fracture fragments was tested. RESULTS: The resistance to compression of groups A1, B1, A2 and B2 were (0.19 +/- 0.18) x 10(6), (0.22 +/- 0.12) x 10(6), (1.67 +/- 0.68) x 10(6) and (0.86 +/- 0.32) x 10(6) N/mm, respectively. There was statistically significant difference between groups A2 and B2 (P < 0.01). The bending stiffnesses of coronal section of groups A1, B1, A2 and B2 were (0.94 +/- 0.25) x 10(3), (1.10 +/- 0.21) x 10(3), (0.70 +/- 0.22) x 10(3), (0.64 +/- 0.21) x 10(3) N/mm, respectively. The bending stiffness of sagittal plane of groups A1, B1, A2 and B2 were (1.06 +/- 0.26) x 10(3), (0.96 +/- 0.25) x 10(3), (0.67 +/- 0.25) x 10(3), (0.61 +/- 0.18) x 10(3) N/mm, respectively. There were no statistically significant differences between groups A1 and B1 or between groups A2 and B2 (P > 0.05). When the torque was 5 Nm, the torsional stiffness of groups A1, B1, A2 and B2 were (4.00 +/- 2.54), (4.76 +/- 1.93), (0.50 +/- 0.63), (0.35 +/- 0.31) Nm/degrees, respectively. When the torque was 8Nm, the torsional stiffness of groups A1, B1, A2 and B2 were (4.30 +/- 3.27), (3.94 +/- 2.01), (0.42 +/- 0.52), (0.36 +/- 0.18) Nm/degrees, respectively. There were statistically significant differences between groups A1 and A2 or between groups B1 and B2 (P < 0.05), and no statistically significant difference between between groups A2 and B2 (P > 0.05). The average maximal pressure generated between the fracture fragments which were fixed with ICDN was 21.6 N, and the pressure between the fracture fragments which were fixed with GK nailing could not be tested. CONCLUSION: The design of ICDN conforms to the special anatomical structure of the femur. ICDN could provide a completely different structure, a different fixation principal and a more balanced fixation than GK nail. ICDN incorporates the flexible and rigid fixation, which is likely to be the trend of the fracture fixation.
Keywords:
本文献已被 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号