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Abstract：
Changes in articular surfaces can be associated with the aging process and as such may lead to quantitative and qualitative impairment of joint motion. This study is aiming to evaluate the age-related quality of the knee joint arthrokinematic motion using nonlinear parameters of the vibroarthrographic (VAG) signal. To analyse the age-related quality of the patellofemoral joint (PFJ), motion vibroarthrography was used. The data that were subject to analysis represent 220 participants divided into five age groups. The VAG signals were acquired during flexion/extension knee motion and described with the following nonlinear parameters: recurrence rate (RR) and multi-scale entropy (MSE). RR and MSE decrease almost in a linear way with age (main effects of group p<0.001; means (SD): RR=0.101(0.057)−0.020(0.017); and MSE=20.9(8.56)−13.6(6.24)). The RR post-hoc analysis showed that there were statistically significant differences (p<0.01) in all comparisons with the exception of the 5th−6th life decade. For MSE, statistically significant differences (p<0.01) occurred for: 3rd−7th, 4th−7th, 5th−7th and 6th life decades. Our results imply that degenerative age-related changes are associated with lower repeatability, greater heterogeneity in state space dynamics, and greater regularity in the time domain of VAG signal. In comparison with linear VAG measures, our results provide additional information about the nature of changes of the vibration dynamics of PFJ motion with age.
摘要：
关节表面的变化可能与衰老过程有关，因此可能导致关节运动的定量和定性损害。这项研究旨在使用振动关节造影（VAG）信号的非线性参数评估膝关节关节运动学运动的年龄相关质量。分析髌股关节（PFJ）的年龄相关质量，使用运动振动关节造影。接受分析的数据代表220名参与者，分为五个年龄组。VAG信号是在屈伸膝关节运动期间采集的，并用以下非线性参数进行描述：复发率（RR）和多尺度熵（MSE）。RR和MSE随年龄几乎呈线性下降(组p<0.001;平均值(SD):RR=0.101(0.057)-0.020(0.017);MSE=20.9(8.56)-13.6(6.24))。RR事后分析显示，除第5-6个生命十年外，所有比较均存在统计学上的显着差异（p<0.01）。对于MSE，统计学上的显着差异（p<0.01）发生在：3-7，第四-第七，第5-第7和第6个生命十年。我们的结果表明，退行性年龄相关的变化与较低的可重复性有关，状态空间动力学中更大的异质性，VAG信号在时域中具有更大的规律性。与线性VAG测量相比，我们的结果提供了有关PFJ运动的振动动力学随年龄变化的性质的其他信息。
