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首页> 外文期刊>Materials science & engineering >The role of fretting-frequency on the damage modes of THR modular junction: In-vitro study
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The role of fretting-frequency on the damage modes of THR modular junction: In-vitro study

机译：烦恼 - 频率对Thr模块结的损伤模式的作用：体外研究

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According to the National Center for Health Statistics, currently, more than 250,000 total hip replacements annually in the US alone, with an estimated increase to 500,000 by the year 2030. The usage of tapered junctions between the femoral neck and head gives the surgeon flexibility in implant assembly. However, these modular junctions are subjected to micro-motion that may cause chemical and fretting-corrosion at the modular junction. Therefore, it is imperative to study these forces to mitigate their effects. The current study aims to understand the effects of fretting-corrosion as a function of fretting frequencies caused by common physical activities in an invitro model of hip modular junctions. The fretting system has a tribological contact condition of flat-on-flat, mounted to a load frame. CoCrMo pins were polished and immersed in a synovial fluid-like electrolyte solution (Bovine calf serum 30 g/l). Electrochemical measurements were made using a potentiostat. Samples then undergo 3600 cycles at 50 mu m (to simulate gross slips), with a horizontal load at 200 N, and a frequency of 0.5 Hz, 0.7 Hz, 1 Hz, and 1.5 Hz to simulate Sit Down-Stand Up, Stair Climb, Walking, and Jogging, respectively. Worn surfaces were then examined under optical and scanning electron microscopy.The evolution of free potential as a function of time for tested frequencies shows the initial potential drop and stabilized trend in the potential evolution. The sample group at a higher frequency displays a higher tendency of corrosion than a lower frequency; however, the dissipation energy decreases as a function of fretting frequency. Both electrochemical and mechanical responses correlate to the variation in the fretting frequencies. Organometallic complexes were found on the surfaces of the samples that were subjected to a slower frequency of fretting, whereas mechanical grooving was noticed on samples with a faster frequency. Hence, these preliminary studies suggest that implant failure rates may be altered based on fretting-frequencies induced by physical activity. Further studies will be required to verify the findings and explore the potential role of fretting frequency in the damage modes of the modular junction.
机译：根据国家卫生统计中心，目前，在美国每年每年每年均超过250,000个，估计到2030年增加了500,000.股骨颈和头部之间的锥形接头的使用使外科医生能够灵活地提供了外科医生的灵活性植入组件。然而，这些模块化结的经受微型运动，其可能在模块化结处引起化学和微动腐蚀。因此，必须研究这些力量来减轻它们的效果。目前的研究旨在了解烦躁腐蚀作为髋关节模型invitro模型中的常见体育活动引起的微动频率的函数的效果。微动系统具有平面平板的摩擦接触条件，安装到负载框架。抛光CocroMo引脚并浸入滑膜液状电解质溶液（牛犊血清30g / L）中。使用恒电容器进行电化学测量。然后样品在50μm（以模拟总线上）以200 n的水平载荷和0.5Hz，0.7Hz，1 Hz的频率进行3600次循环，并且0.7Hz，1 Hz和1.5Hz模拟坐下的坐垫，楼梯爬升，步行和慢跑。然后在光学和扫描电子显微镜下检查磨损的表面。作为测试频率的时间的可自由势的演化显示出潜在演化的初始潜在下降和稳定趋势。更高频率的样品组显示比较低频率更高的腐蚀趋势;然而，耗散能量随着烦恼频率的函数而降低。电化学和机械响应都与微动频率的变化相关。在样品的表面上发现有机金属复合物，其进行较慢的微动频率，而机械槽在具有更快的频率的样品上被注意到。因此，这些初步研究表明，可以基于身体活动诱导的微动频率来改变植入失效率。需要进一步的研究来验证调查结果并探讨微动频率在模块化交叉点的损伤模式中的潜在作用。

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