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首页> 外文期刊>Structural health monitoring >IWSHM 2017: Application of guided wave methods to quantitatively assess healing in osseointegrated prostheses
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IWSHM 2017: Application of guided wave methods to quantitatively assess healing in osseointegrated prostheses

机译：IWSHM 2017：导波方法在骨整合假体中定量评估愈合的应用

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Osseointegrated prosthesis is essentially a prosthetic fixture surgically implanted into the bone that extends out of the limb so that an artificial limb can be attached. While osseointegrated prostheses can dramatically improve the quality of life of amputees, there remains a lack of quantitative evidence of the osseointegration process that occurs at the bone–prosthesis surface after surgery. This study advances a sensing strategy that employs piezoelectric elements mounted to the percutaneous end of the prosthesis to generate guided waves that propagate along the length of the prosthesis fixture. The properties of the guided waves exhibit sensitivity to both the degree of bone healing that occurs at the prosthesis surface and the movement of the prosthesis due to loss of osseointegration. Use of the prosthesis as a wave guide offers care providers a quantitative approach to determining when an osseointegrated prosthesis can be loaded and tracks the integrity of osseointegration over the lifespan of the amputee. The study validates the proposed guided wave strategy using a prosthesis model consisting of a solid titanium rod implanted in an adult femoral bone. First, a high-fidelity finite element model is created to study changes in guided waves as a result of bone healing. A laboratory model is also adopted using a synthetic femoral bone identical to that modeled in the finite element model. The energy of the first longitudinal wave mode introduced at the percutaneous end of the prosthesis provides a repeatable metric for accurate assessment of both osseointegration and prosthesis pullout from the bone. The results of this study reveal that the energy of the longitudinal wave mode decreases by nearly half during the osseointegration healing process. In addition, the wave energy is also found to increase as the osseointegrated fixture loosens and is withdrawn from the bone.
机译：骨整合假体本质上是通过外科手术植入到骨骼中的假肢，该假肢从肢体伸出，从而可以连接人造肢体。虽然骨整合假体可以显着改善截肢者的生活质量，但仍缺乏定量证据表明手术后骨-假体表面发生骨整合过程。这项研究提出了一种传感策略，该策略采用安装在假体经皮末端的压电元件来产生沿假体固定装置的长度传播的导波。导波的特性对假体表面发生的骨愈合程度和由于骨整合的丧失而引起的假体运动都表现出敏感性。使用假体作为波导为护理提供者提供了一种定量方法，可确定何时可以装入骨整合型假体，并跟踪截肢者整个生命周期内骨整合的完整性。该研究使用假体模型验证了建议的导波策略，该假体模型由植入成人股骨的实心钛棒组成。首先，创建一个高保真有限元模型，以研究由于骨愈合而导致的导波变化。还使用了与有限元模型中的模型相同的合成股骨，采用了实验室模型。在假体的经皮末端引入的第一纵波模式的能量提供了可重复的度量，可用于准确评估骨整合和假体从骨骼中拔出。这项研究的结果表明，在骨整合愈合过程中，纵波模式的能量减少了近一半。此外，还发现，随着骨整合固定器的松动并从骨骼中撤出，波能也会增加。

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