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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.