摘要
目的研究一种新的用于四角融合的内固定器械和方法。方法根据国人头状骨、月骨、三角骨和钩骨的测量数据及解剖特点,采用镍钛记忆合金制作腕骨四角融合器(NiTi shape memory alloy four-corner arthrodesis concentrator,NT-FCAC);取32侧成人头状骨、月骨、三角骨和钩骨标本,分别采用NT- FCAC和克氏针固定,体外模拟四角融合术,用858型双轴液压材料测试系统(858-MTS)测试其固定强度;2 件NT-FCAC施加20-200N循环拉伸载荷(1Hz),观察NT-FCAC的形变情况;分析试验结果,评价NT-FCAC 的生物力学特性。结果 NT-FCAC固定臂产生的回复力可将头状骨、月骨、三角骨和钩骨聚合于一体,体部可遮挡植入上述4处腕骨间关节间隙的松质骨,防止其滑脱;NT-FCAC组固定强度大于克氏针组(P< 0．05);2件NT-FCAC发生形变达到6％时,施加的载荷次数分别为4 239次和4 068次。结论 NT-FCAC 的设计符合头状骨、月骨、三角骨和钩骨的解剖特点,其固定强度可满足四角融合术后不需外固定、早期功能锻炼的生物力学要求,疲劳强度可满足四角融合术后达骨性愈合的需要。
Objective To develop a new internal fixator and new method for four-corner arthrodesis. Methods According to the acquired measurements and anatomic features of the four carpal bones （capitate, lunate, triquetrum and hamate） in Chinese population, a special internal fixatur-NiTi shape memory alloy four-corner arthredesis concentrator （NT-FCAC） was designed. There were 32 specimens of the four bones in this investigation. Four-corner arthrodesis was carried out in each specimen, 16 using the new device while the other 16 using Kirschner wires. Their fixed strength was tested by a hydrolic pressure biomechanical system MTS-858. Two NT-FCAGs were fatigued with 20 - 200N cycling pulling load （1Hz） delivered by MTS-858 and the deformations of them were carefully observed. Finally, the biomechanical features of NT-FCAC were evaluated according to the tested data. Results The four bones could be concentrated by the restored force that was made generated by the fixed arms of NT-FCAC. The implanted cancerous bones in the intercarpal joint could be hold in place by the body of NT-FCAC. The fixed strength was stronger in NT-FCAC group than in Kirschner wires group（ P 〈 0.05）. When the two NT-FCAC were deformed to 6% by pulling load, they had resisted the pulling load for 4239 times and 4068 times respectively. Conclusion The design of NT-FCAC is in accordance with the anatomic features of the four carpal bones. It biomechanical strength allows early movement. The range of fatigue strength covers the period for bony fusion.
出处
《中华手外科杂志》
CSCD
北大核心
2006年第3期137-139,共3页
Chinese Journal of Hand Surgery
基金
全军医药卫生科研基金资助项目(06MA140)
关键词
腕骨
内固定器
生物力学
模型
解剖学
Carpal bones
Internal fixators
Biomechanics
Models,anatomic
