摘要
【目的】设计和研制了一种新型的交锁钉——轴向控制动力性髓内钉(ACDIN),并进行生物力学测试、分析。【方法】ACDIN钉,其远端与G-K钉相同;而近端根据股骨和胫骨近端髓腔的解剖特点分别增加了2或4个轴向控制板。采用12对新鲜的成人股骨的标本,然后将标本按左右分为3组,每组都有8根标本:对照组、股骨轴向控制动力性锁钉处理组和G-K交锁钉处理组。将ACDIN钉与G-K钉分别安装在MTS858实验机上,进行压缩应变及抗扭转测试分析和比较。【结果】在抗扭转强度方面,ACDIN钉为(1.90±0.40)Nm/(°)与G-K钉(1.94±0.35)Nm/(°)之间无显著性差异;与对照组和ACDIN处理组相比较,G-K处理组的下后方压缩应变量最低,为(1.47±0.26)×10-4N/mm;G-K处理组的两锁钉间压缩刚度应变值最高,为(4.9±1.6)×10-4N/mm,差别均具有统计学意义(P<0.001)。ACDIN处理组与对照组相比较,下后方压缩刚度和两锁钉间压缩刚度均没有显著性差异[分别是(2.63±0.77)×10-4N/mm对(2.53±0.32)×10-4N/mm和(2.6±1.3)×10-4N/mm对(2.6±0.6)×10-4N/mm,P>0.05)。【结论】轴向控制动力性锁钉能够起到平衡固定的作用,具有良好的生物力学性能。
[Objective] To develop a new-style axial controlled dynamic intramedullary nail （ACDIN） and evaluate its biomechanical characteristics. [Method] The distal end of ACDIN nail was the same as that of GK nail （Grosse-Kempf nail）. The proximal end was added with 2 or 4 axis control panel in accordance with the anatomical characteristics of proximal cavity of the femur and tibia. Twelve pairs of fi＇esh adult femoral specimens were divided into one control group and two tested groups. In test groups, type A3 （OTA） femoral fracture were produced and fixed with G-K nail and ACDIN respectively. In all groups, compressive and torsional test were carried out with the 858 mini Bionix test system. The torsional stiffness and strain of ACDIN and Grosse- Kempf nail （G-K nail） were compared. [Results] There was no significant difference in torsional stiffness between ACDIN and G-K nail, which was （1.90 ± 0.40） Nm/（°） and （1.94 ± 0.35）Nm/（°）, respectively. Compared with ACDIN and the control group, G-K nail yiehled the least strain on the infra-pone aspect, which was （1.47 ± 0.26） × 10^4 N/mm; while between the two interlocked screws, G-K nail produced the highest strain which was （4.9 ± 1.6） × 10^-4 N/mm. There was no significant difference in strain between ACDIN and control group either on the infra-pone aspect or between the two interlocked screws [ （2.63 ± 0.77） × 10^-4 N/mm vs. （2.53 ±0.32） × 10^-4 N/mm and （2.6 ± 1.3） × 10^-4 N/mm vs. （2.6 ± 0.6） × 10^-4 N/mm, respectively]. [Conclusion] ACDIN is an effective and convenient implant which could provide a better biomechanical stability and a more balanced fixation than G-K nail.
出处
《中山大学学报（医学科学版）》
CAS
CSCD
北大核心
2009年第2期228-231,共4页
Journal of Sun Yat-Sen University:Medical Sciences
基金
广东省科技计划项目(2003C103014)
关键词
骨折
内固定
生物力学
平衡固定
fracture
internal fixation
biomechanics
balanced fixation
