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首页> 外文期刊>Research Journal of Medical Sciences >Acoustic Properties of Femoral Components of Hip Endoprostheses Analysis Using Frequency-Resonance-Measurement in a Soft Tissue Simulation Model
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Acoustic Properties of Femoral Components of Hip Endoprostheses Analysis Using Frequency-Resonance-Measurement in a Soft Tissue Simulation Model

机译：在软组织模拟模型中使用频率共振测量分析髋关节内膜假体股骨的声学特性

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Objective of this study is if the technique of Frequency-Resonance Measurement (FRM) can be used to reliably and non-invasively detect the loosening of the femoral component of a metal hip endoprosthesis. As a first step to determine the feasibility of FRM we investigated the own sound property of a full metal body hip endoprosthesis. Four different types of endoprostheses were tested to establish their acoustic properties regarding own frequency and resonance. In the first step the acoustic properties of the implants were determined. In the second step the acoustic properties of these metal specimens under the influence of a soft tissue simulation were investigated. The test results for the investigated prostheses showed typical similarities regarding the pattern of the spectral lines as well as the duration of the oscillations. All spectral lines where sharply marked and were situated between 1-20 kHz. The duration of oscillation was up to 700 ms. In all tested series the correlation in the 6 measurements of each prosthesis model in each mode were >0.95. In a soft tissue simulation model there still was a detectable specific acoustic pattern for each prosthesis model. FRM might be used as a remote and non-invasive tool for monitoring in-growth or loosening of hip endoprostheses. Mutations in this dimension can be easily automated for a computerized evaluation. The soft tissue dampening is a factor of less importance. We have now begun in vivo studies of different interface situations, cadaver studies are planned after that.
机译：这项研究的目的是，是否可以使用频率共振测量（FRM）技术来可靠，无创地检测金属髋关节假体的股骨组件的松动。作为确定FRM可行性的第一步，我们研究了全金属人体髋关节假体的自身音质。测试了四种不同类型的内置假体，以建立其关于自身频率和共振的声学特性。第一步，确定植入物的声学特性。在第二步中，研究了在软组织模拟的影响下这些金属标本的声学特性。所研究假体的测试结果显示出关于谱线图样以及振荡持续时间的典型相似性。所有频谱线均清晰标记，并且位于1-20 kHz之间。振荡持续时间高达700毫秒。在所有测试系列中，每种模式下每种假体模型的6次测量的相关性均> 0.95。在软组织仿真模型中，每个假体模型仍然存在可检测的特定声学模式。 FRM可用作监视髋关节假体生长或松弛的远程和非侵入性工具。此维度上的变异可以很容易地自动进行计算机化评估。软组织阻尼是不太重要的因素。我们现在已经开始对不同界面情况进行体内研究，然后计划进行尸体研究。

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