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

VernacularTitle: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
Author: Fu-Liang GONG ¹ ; Kun-Zheng WANG ; Xiao-Qian DANG ; Chun-Sheng WANG ; Zhi-Bin SHI
Author Information

1. 西安交通大学
Keywords: interlocking nails; distal bolts; biomechanics
From: Journal of Southern Medical University 2005;25(5):488-492
CountryChina
Language:Chinese
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.