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首页> 外文期刊>Experimental Mechanics >Experimental Measurement and Numerical Validation of Bone Cement Mantle Strains of an In Vitro Hip Replacement Using Optical FBG Sensors
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Experimental Measurement and Numerical Validation of Bone Cement Mantle Strains of an In Vitro Hip Replacement Using Optical FBG Sensors

机译：使用光学FBG传感器进行髋关节置换术的骨水泥套膜应变的实验测量和数值验证

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摘要

Experimental pre-clinical tests associated with numeric models of cemented implants are important for screening of new implants in the market. The aim of this study was to measure strain profiles and maximum temperature polymerization inside a cement mantle of an in vitro cemented hip reconstruction using optical fiber Bragg grating (FBG) sensors. For this purpose, a hip femoral prosthesis was instrumented with 12 FBG sensors, three in each aspect of the femur, anterior, posterior, medial and lateral. These were positioned at the proximal, middle and distal part of the cement mantle relatively to the stem. Another sensor was placed in the lateral-proximal region of the mantle to measure the maximum temperature of cement polymerization. The strains measured were compared with those obtained with a Finite Element model, both for quaistatic mechanical loading. The results show that the experimental technique used can measure strains inside the cement mantle with good correlation, R ~2 = 0. 970, with the numerical model results. The results present a maximum temperature of polymerization around 110°C inside of cement at proximal region. It was also observed strain concentration in lateral aspect of the femur in polymerization process. The procedure hereby explained can be used to improve experimental pre-clinical tests to measure the strain distribution inside the cement mantle as well as residual strain and temperature variation along with time, as a result of the curing process of cement.
机译：与骨水泥植入物的数值模型相关的实验前临床试验对于筛选市场上的新植入物非常重要。这项研究的目的是测量使用光纤布拉格光栅（FBG）传感器进行的体外骨水泥髋关节重建的水泥骨内部的应变曲线和最高温度聚合。为此目的，用12个FBG传感器对髋部股骨假体进行了器械检查，在股骨的各个方面，前，后，内侧和外侧各三个。这些被放置在相对于茎干的水泥套的近端，中间和远端。将另一个传感器放置在地幔的近侧区域中，以测量水泥聚合的最高温度。将所测得的应变与通过有限元模型获得的应变进行了准静态机械载荷的比较。结果表明，所采用的实验技术可以测量水泥地幔内部的应变，具有良好的相关性，R〜2 = 0. 970，具有数值模型结果。结果显示了近端区域水泥内部约110°C的最高聚合温度。还观察到在聚合过程中股骨侧面的应变集中。此处说明的程序可用于改进临床前临床试验，以测量水泥固化过程中水泥套内部的应变分布以及随时间变化的残余应变和温度变化。

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