Acutrak无头加压螺钉与AO空心拉力螺钉固定Hoffa骨折的生物力学比较
[A biomechanical comparison of Acutrak headless compression screw and AO cannulated lag screw for the fixation of Hoffa fracture].
作者信息
Peng Jing, Zhang Shu-Liang, Feng Pin, Jiang Yong, Zou Chang, Zhang Hui, Tu Chong-Qi
机构信息
Department of Orthopedics, West China Hospital, Sichuan University, Chengdu 610041, China.
出版信息
Sichuan Da Xue Xue Bao Yi Xue Ban. 2013 Mar;44(2):226-30.
OBJECTIVE
To compare the stability, strength of Letenneur type I Hoffa fractures fixed by Acutrak headless compression screws and AO cannulated lag screws.
METHODS
12 models of Letenneur type I Hoffa fractures were randomly divided into 4 groups, which were fixed with two AO cannulated lag screws or Acutrak headless compression screws anteroposteriorly or posteroanteriorly. The stress between two fragments of all specimens was tested. Axial compression test, the cycle load test and the limit load test were successively performed in every specimen.
RESULTS
In axial compression test, displacement of Acutrak headless compression screw groups was lower than that of AO cannulated lag screw anteroposteriorly (P < 0.05). The load to failure for Acutrak headless compression screw groups was higher than that of AO cannulated lag screws (P < 0.05), no matter in anteroposterior or posteroanterior direction.
CONCLUSION
The strength and stability of Letenneur type I Hoffa fractures fixeded with Acutrak headless compression screw were superior to those provided by AO cannulated lag screw. The direction of screw affects the initial stability for AO cannulated lag screw, other than Acutrak headless compression screw.
目的
比较Acutrak无头加压螺钉和AO空心拉力螺钉固定Letenneur I型Hoffa骨折的稳定性和强度。
方法
将12个Letenneur I型Hoffa骨折模型随机分为4组，分别从前向后或从后向前用两枚AO空心拉力螺钉或Acutrak无头加压螺钉固定。测试所有标本两块骨折块之间的应力。对每个标本依次进行轴向压缩试验、循环载荷试验和极限载荷试验。
结果
在轴向压缩试验中，Acutrak无头加压螺钉组的位移低于AO空心拉力螺钉从前向后固定组（P<0.05）。无论从前向后还是从后向前，Acutrak无头加压螺钉组的破坏载荷均高于AO空心拉力螺钉组（P<0.05）。
结论
Acutrak无头加压螺钉固定Letenneur I型Hoffa骨折的强度和稳定性优于AO空心拉力螺钉。螺钉方向对AO空心拉力螺钉的初始稳定性有影响，而对Acutrak无头加压螺钉无影响。
Zotero 插件