...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Injury >Mechanical stress on tensioned wires at direct and indirect loading: a biomechanical study on the Ilizarov external fixator.
【24h】

Mechanical stress on tensioned wires at direct and indirect loading: a biomechanical study on the Ilizarov external fixator.

机译：在直接和间接载荷下张紧钢丝上的机械应力：对Ilizarov外固定器的生物力学研究。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

BACKGROUND: The biomechanical effect of indirect weight loading with the Ilizarov ring fixator using a weight-bearing platform has not yet been investigated. The problem of wire loosening and breakage occurs more frequently when patients are mobilised with a weight-bearing platform. Therefore, the aim of this research was to compare the influence of direct and indirect weight loading on the tensioned wires. METHOD: A universal testing machine (UTS, Germany) was used in this study. A composite tibia model with a standard four-ring Ilizarov fixator and 1.8-mm wires in anatomical position was used to simulate a clinical situation. Wire strain was measured with two strain gauges positioned at the ring-wire interface of each wire. After a standardised 2-mm mid-diaphyseal osteotomy, an axial load of up to 1000 N was applied to the bone; the different methods of weight loading were evaluated in two experimental set-ups. RESULTS: A higher axial load was necessary to achieve an osteotomy gap closure at indirect loading. Mechanical stress on the tensioned wires was 400% higher on the proximal wires and 250% higher on the distal wires at a maximum axial loading of 1000 N. Mechanical stress remained on the wires in indirect loading, even after bone end contact, and led to excessive stress under higher weight-bearing amounts. CONCLUSION: There is a substantial change in the biomechanical characteristics of the Ilizarov ring fixator when mobilising a patient with a weight-bearing platform. The considerable higher mechanical stress on the wires needs to be considered when patients are mobilised with a weight-bearing platform.
机译：背景：使用负重平台使用Ilizarov环固定器间接负重的生物力学效果尚未得到研究。当使用承重平台动员患者时，电线松动和断裂的问题更经常发生。因此，本研究的目的是比较直接和间接重量负载对张紧钢丝的影响。方法：本研究使用了通用测试机（UTS，德国）。使用标准的四环Ilizarov固定器和解剖位置为1.8毫米金属丝的复合胫骨模型来模拟临床情况。用位于每条线的环形线界面处的两个应变仪测量线应变。在标准的2毫米中干dia端截骨术之后，将最大1000 N的轴向载荷施加到骨骼上。在两个实验装置中评估了不同的重量加载方法。结果：需要更高的轴向载荷以在间接载荷下实现截骨术间隙的闭合。在最大轴向载荷为1000 N时，张紧的钢丝上的机械应力在近端的钢丝上高400％，在远端的钢丝上高250％。即使在骨头端接触后，间接载荷下，钢丝上的机械应力仍保持在间接应力下在较高的承重量下承受过度的压力。结论：用承重平台动员患者时，Ilizarov环固定器的生物力学特性发生了重大变化。当使用承重平台动员患者时，必须考虑到导线上明显较高的机械应力。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号