A novel structural dynamics test method and device were designed to test the biomechanical effects of dynamic axial loading on knee cartilage and meniscus. Firstly, the maximum acceleration signal-to-noise ratio of the experimental device was calculated by applying axial dynamic load to the experimental device under unloaded condition with different force hammers. Then the experimental samples were divided into non-specimen group (no specimen loaded), sham specimen group (loaded with polypropylene samples) and bovine knee joint specimen group (loaded with bovine knee joint samples) for testing. The test results show that the experimental device and method can provide stable axial dynamic load, and the experimental results have good repeatability. The final results confirm that the dynamic characteristics of experimental samples can be distinguished effectively by this device. The experimental method proposed in this study provides a new way to further study the biomechanical mechanism of knee joint structural response under axial dynamic load.
本研究设计一种新的结构动力学测试方法及装置，用于测试动态轴向载荷对膝关节软骨与半月板的生物力学影响。首先，使用不同力锤对空载状态下实验装置施加轴向动载荷，计算实验装置的最大加速度信噪比。然后，将实验标本分为无标本组（空载，无标本）、假标本组（加载聚丙烯标本）、牛膝关节标本组（加载牛膝关节标本），进行测试。测试结果表明，该实验装置及方法可提供稳定的轴向动载荷，且实验结果有较好的可重复性。最终结果证实，通过本研究设计的装置可以有效区分实验标本的动态特性。本研究提出的实验方法为深入研究轴向动载荷作用下膝关节结构响应的生物力学机制提供了新的途径。.
Keywords: Bio-mechanics; Cartilage injury; Dynamics of structures; Knee osteoarthritis; Meniscal injury.