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Table 2 Parameters of vibroacoustic signal in patient and healthy control groups

From: Joint motion quality in vibroacoustic signal analysis for patients with patellofemoral joint disorders

  VMS R4 P1 P2
Controls (C), N = 64 0.003 ± 0.007 1.609 ± 1.121 1.56 ± 1.79 0.24 ± 0.39
Patients
 With chondromalacia (CMP), N = 35 0.178 ± 0.311 5.422 ± 3.021 23.89 ± 22.57 6.49 ± 8.99
 With lateral compression syndrome (LPCS), N = 25 0.423 ± 0.413 7.855 ± 2.693 25.73 ± 17.66 3.13 ± 2.68
 With osteoarthritis (OA), N = 26 0.869 ± 1.076 9.106 ± 2.167 60.28 ± 44.34 10.99 ± 7.54
P-value
 CMP vs C 0.454 <0.001 <0.001 <0.001
 LPCS vs C 0.015 <0.001 <0.001 0.240
 OA vs C <0.001 <0.001 <0.001 <0.001
 CMP vs LPCS 0.306 <0.001 0.991 0.130
 LPCS vs OA 0.008 0.170 <0.001 <0.001
 CMP vs OA <0.001 <0.001 <0.001 0.016
  1. Abbreviations: VMS, variance of the mean squares calculated in 5 ms windows; R4, the difference between the mean of four maximum and the mean of four minimum values; P1, P2, power spectral density bands: 50–250 Hz and 250–450 Hz, respectively; N, number of knees.