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首页> 外文期刊>The Journal of Strain Analysis for Engineering Design >A novel method for determining the time and location of abrupt fracture initiation in bones
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A novel method for determining the time and location of abrupt fracture initiation in bones

机译：一种确定骨骼中突然骨折发生的时间和位置的新方法

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摘要

Investigation of bone failure is extremely important in orthopaedic biomechanics to reduce the risk of fracture in diseased and operated patients. Identification of the point where fracture starts would be extremely valuable to better understand bone mechanics. However, as abrupt fractures of bones occur in milliseconds, most in vitro studies report the failure load, but cannot localize the point of fracture initiation. Commercially available grid-based or foil crack gauges cannot be applied to the complex double-curvature geometry of bones. In this paper a method is proposed for preparing a fine conductive crack-grid on the bone surface, combined with a dedicated data logger. The proposed system offers a spatial resolution of 0.5–2.0 mm, and a sampling rate of 700 kHz. Suitability of the crack-grid to withstand bone strains prior to failure was checked. A preliminary application on bone specimens confirmed that: (a) preparation of the crack-grid on the bone surface is possible; (b) accurate and consistent results are obtained that enable identification of the fracture initiation point; (c) this method is sensitive to differences in crack propagation rate, depending on alignment with respect to the tissue structure, and on quality of the bone tissue. The applicability and accuracy of this method was finally shown on a real femur, which was tested while a high-speed camera and the proposed crack-grid simultaneously recorded abrupt fracture. The proposed system will provide new insights into fracture mechanics of bone structures (including abrupt fractures).
机译：在骨科生物力学中，骨衰的研究对于降低患病和手术患者的骨折风险非常重要。识别骨折开始点对于更好地了解骨骼力学非常有价值。但是，由于骨骼突然断裂发生在毫秒内，因此大多数体外研究都报告了破坏载荷，但无法确定骨折的起始点。市售的基于网格或箔片的裂纹规不能应用于复杂的双曲率骨骼几何。本文提出了一种与专用数据记录仪结合使用的在骨表面上制备精细导电裂纹网格的方法。拟议的系统提供0.5-2.0 mm的空间分辨率和700 kHz的采样率。检查裂纹网格在失效之前承受骨应变的适合性。在骨标本上的初步应用证实：（a）可以在骨表面上制备裂缝格栅； （b）获得准确一致的结果，从而能够确定骨折的起始点； （c）该方法对裂纹扩展速率的差异敏感，这取决于相对于组织结构的对齐方式以及骨组织的质量。最终在真实的股骨上显示了该方法的适用性和准确性，并在高速摄像头和建议的裂纹网格同时记录突然断裂的同时进行了测试。拟议的系统将提供有关骨骼结构（包括突然骨折）的骨折力学的新见解。

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