Faculty of Physical Education and Physiotherapy, Opole University of Technology, 45-758 Opole, Poland.
Faculty of Electrical Engineering, Automatic Control and Informatics, Opole University of Technology, 45-758 Opole, Poland.
Sensors (Basel). 2022 Jul 25;22(15):5549. doi: 10.3390/s22155549.
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.
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伤。本研究旨在使用振动关节图（VAG）信号的非线性参数评估膝关节关节运动的与年龄相关的质量。为了分析髌股关节（PFJ）的与年龄相关的质量，使用了运动振动关节图。分析所涉及的数据代表了分为五个年龄组的 220 名参与者。VAG 信号是在膝关节屈伸运动期间获得的，并使用以下非线性参数进行描述：递归率（RR）和多尺度熵（MSE）。RR 和 MSE 几乎呈线性方式随年龄下降（组的主要影响 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，除了第 5-6 个生活十年外，所有比较均存在统计学差异（p<0.01）。对于 MSE，统计学上有显著差异（p<0.01）：第 3-7 个、第 4-7 个、第 5-7 个和第 6 个生活十年。我们的结果表明，与年龄相关的退行性变化与较低的可重复性、状态空间动力学的更大异质性以及 VAG 信号时域的更大规律性相关。与线性 VAG 测量相比，我们的结果提供了关于 PFJ 运动振动动力学随年龄变化的性质的附加信息。
