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Stability of structures01:14

Stability of structures

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In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
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对于创伤性肘部不稳定性进行内部和外部稳定性的比较:系统性审查.

John J Heifner1, Ty A Davis2, Robert J Rowland2

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与内部关节稳定器 (IJS) 相比,外部固定 (ExFix) 对于创伤性肘部不稳定性显示出更高的复发性不稳定性和针相关并发症率. IJS表明,肘部不稳定性治疗的并发症概况可能更安全.

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科学领域:

  • 整形外科手术 整形外科手术
  • 创伤护理 创伤护理
  • 生物医学工程 生物医学工程

背景情况:

  • 创伤性肘部伤害往往导致持续的不稳定,尽管手术修复.
  • 临时的内部关节稳定器 (IJS) 或外部固定器 (ExFix) 可能是必要的,以支持修复的结构并保持关节对齐.
  • 对于肘部不稳定的ExFix和IJS之间的并发症风险的比较数据有限.

研究的目的:

  • 系统地审查和比较外部固定 (ExFix) 和内部关节稳定器 (IJS) 在管理创伤性肘部不稳定性方面的并发症概况.
  • 综合现有文献,为临床决策提供有关最佳固定方法的信息.

主要方法:

  • 按照PRISMA指南进行了一次系统的文献审查.
  • 包括比较ExFix和IJS在成人患者急性或慢性肘部不稳定的研究.
  • 偏差风险和质量评估是使用既定框架进行的.

主要成果:

  • 复发不稳定性率为ExFix (N=435) 的7.0%,与IJS (N=171) 的4.1%相比,或1.93 (95% CI 0.88-4.23).
  • 设备故障率是相似的:ExFix为4.1%,IJS为4.4%.
  • 与pin相关的并发症在ExFix (14.6%) 中很常见,而IJS并发症包括炎症反应和手术部位感染.

结论:

  • 在ExFix和IJS对创伤肘部不稳定的并发症概况中存在着显著的差异.
  • 外部固定与更高的针相关并发症发生率和增加反复不稳定的趋势有关.
  • 内部关节稳定剂可能提供一种有利的替代方案,具有明显的,可能较低的并发症概况.