Schneider E, Chao E Y
J Biomech. 1983;16(8):591-601. doi: 10.1016/0021-9290(83)90109-4.
Fourier analysis was performed on the ground reaction force patterns during gait in 26 normals and 10 patients with knee joint disease prior to total knee replacement. A method was developed to determine the essential number of harmonics for each force component, based on data sampling rate and the level of accuracy required in reconstructing the original patterns. The criteria used to select the level of accuracy depend upon the type of analysis to be performed. Only the first two to four harmonics, plus the constant term, were found to be the dominating coefficients in describing each of the reaction force patterns, and they are subsequently used as the key parameters in differentiating normals and patients with knee joint disease. The advantages of this method and its implication to objective gait analysis in biomechanics are discussed.
对26名正常人和10名全膝关节置换术前膝关节疾病患者在步态期间的地面反作用力模式进行了傅里叶分析。基于数据采样率和重建原始模式所需的精度水平，开发了一种方法来确定每个力分量的基本谐波数量。用于选择精度水平的标准取决于要执行的分析类型。结果发现，在描述每个反作用力模式时，只有前两到四个谐波加上常数项是主要系数，随后它们被用作区分正常人和膝关节疾病患者的关键参数。讨论了该方法的优点及其对生物力学中客观步态分析的意义。
