Leuridan Steven, Goossens Quentin, Vander Sloten Tom, De Landsheer Koen, Delport Hendrik, Pastrav Leonard, Denis Kathleen, Desmet Wim, Vander Sloten Jos
KU Leuven, Department of Mechanical Engineering, Biomechanics Section, Celestijnenlaan 300C - box 2419, 3000 Leuven, Belgium.
KU Leuven, Department of Mechanical Engineering, Biomechanics Section, Celestijnenlaan 300C - box 2419, 3000 Leuven, Belgium; KU Leuven, Department of Mechanical Engineering, Smart Instrumentation, Andreas Vesaliusstraat 13 - box 2600, 3000 Leuven, Belgium.
Med Eng Phys. 2017 Nov;49:109-120. doi: 10.1016/j.medengphy.2017.08.007. Epub 2017 Sep 1.
The preoperative diagnosis of loosening of cemented tibial knee implants is challenging. This feasibility study explored the basic potential of a vibration-based method as an alternative diagnostic technique to assess the fixation state of a cemented tibia implant and establish the method's sensitivity limits. A combined in vitro and in silico approach was pursued. Several loosening cases were simulated. The largest changes in the vibrational behavior were obtained in the frequency range above 1500 Hz. The vibrational behavior was described with two features; the frequency response function and the power spectral density band power. Using both features, all experimentally simulated loosening cases could clearly be distinguished from the fully cemented cases. By complementing the experimental work with an in silico study, it was shown that loosening of approximately 14% of the implant surface on the lateral and medial side was detectable with a vibration-based method. Proximal lateral and medial locations on the tibia or locations toward the edge of the implant surface measured in the longitudinal direction were the most sensitive measurement and excitation locations to assess implant fixation. These results contribute to the development of vibration-based methods as an alternative follow-up method to detect loosened tibia implants.
骨水泥型胫骨膝关节植入物松动的术前诊断具有挑战性。这项可行性研究探索了基于振动的方法作为一种替代诊断技术来评估骨水泥型胫骨植入物固定状态的基本潜力，并确定该方法的灵敏度极限。采用了体外和计算机模拟相结合的方法。模拟了几种松动情况。在1500赫兹以上的频率范围内获得了振动行为的最大变化。用两个特征描述振动行为：频率响应函数和功率谱密度带功率。利用这两个特征，可以将所有实验模拟的松动情况与完全骨水泥固定的情况清楚地区分开来。通过计算机模拟研究对实验工作进行补充，结果表明，基于振动的方法可以检测到植入物外侧和内侧约14%的表面松动。胫骨近端外侧和内侧位置或沿纵向在植入物表面边缘方向的位置是评估植入物固定最敏感的测量和激励位置。这些结果有助于开发基于振动的方法，作为检测胫骨植入物松动的一种替代随访方法。
