远端一枚或两枚锁钉对胫骨髓内钉力学性能影响的对比研究

南方医科大学学报 ›› 2005, Vol. 25 ›› Issue (05): 488-492.

远端一枚或两枚锁钉对胫骨髓内钉力学性能影响的对比研究

宫福良, 王坤正, 党晓谦, 王春生, 时志斌

西安交通大学第二医院骨科, 陕西, 西安, 710004

出版日期:2005-05-20 发布日期:2005-05-20
基金资助:
收稿日期:2004-11-7。
通讯作者:WANG Kun-zheng(1955- ),Tel:029-87679678,E-mail:wangkunzheng@21cn.com

Effect of one versus two distal locking bolts on the biomechanics of tibial interlocking nail: a comparative study using a new model

GONG Fu-liang, WANG Kun-zheng, DANG Xiao-qian, WANG Chun-sheng, SHI Zhi-bin

西安交通大学第二医院骨科, 陕西, 西安, 710004

Online:2005-05-20 Published:2005-05-20

摘要/Abstract

摘要： 目的研究髓内钉远端锁钉数目对胫骨加锁髓内钉整体力学性能是否有影响.方法实验共选用20根国产钛合金制造的9mm胫骨加锁髓内钉.将所有髓内钉随机分成两组,即远端安装单枚锁钉的单锁钉组,和远端安装2枚锁钉的双锁钉组.每组中各随机选用5根分别在万能力学实验机上进行压缩和扭转力学测试.测试所用的模型为根据国内外实验结果自行研究的不锈钢模型.结果在压缩实验中,单钉组平均最大压缩载荷为1 850N,双钉组的平均最大载荷为2150N,双钉组抗压缩能力显著高于单钉组(P<0.05).在扭转实验中,单钉组平均最大扭矩、扭角分别为55.54N·m和57.36°,双钉组分别为55.78N·m和58.28°,两组差异无统计学意义(P>0.05).结论胫骨髓内钉远端用单枚锁钉时其整体力学性质能满足临床要求.对于较严重的骨折类型还是推荐安装两枚远端锁钉.本实验采用的力学测量模型方便实用且经济易得,尤其适于髓内钉的力学对比研究.

Abstract: Objective To investigate the impact of one versus two distal locking bolts on the mechanical properties of tibial interlocking intramedullary nails.Methods Twenty 9-mm titanium alloy locking nails were divided into two equal groups in which the nails were fixed with only one and two distal locking bolts, respectively. Each group was further divided into two sub-groups for compression and torsion tests separately using a universal material-testing machine.Results In the compression tests, the average maximum strength of double bolts was greater than that of the single bolt (P<0.05), but the number of the bolts did not significantly affect the results of the torsion tests in terms of the either the maximum torsion moment or angle (P>0.05).Conclusion One distal bolt is sufficient for fixing stable fractures and double bolts are recommended for management of serious fractures. The model we used is convenient and economic for examining the biomechanics of the tibial nails, especially for comparative purposes.

中图分类号:

宫福良, 王坤正, 党晓谦, 王春生, 时志斌. 远端一枚或两枚锁钉对胫骨髓内钉力学性能影响的对比研究[J]. 南方医科大学学报, 2005, 25(05): 488-492.

GONG Fu-liang, WANG Kun-zheng, DANG Xiao-qian, WANG Chun-sheng, SHI Zhi-bin. Effect of one versus two distal locking bolts on the biomechanics of tibial interlocking nail: a comparative study using a new model[J]. Journal of Southern Medical University, 2005, 25(05): 488-492.

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