Vibroarthrographic analysis of patellofemoral joint arthrokinematics during squats with increasing external loads
Background: The patellofemoral joint (PFJ) provides extremely low kinetic friction, which results in optimal arthrokinematic motion quality. Previous research showed that these friction-reducing properties may be diminished due to the increase in articular contact forces. However, this phenomenon has been not analyzed in vivo during functional daily-living activities. The aim of this study was the vibroarthrographic assessment of changes in PFJ arthrokinematics during squats with variated loads.
Methods: Fifty-seven asymptomatic subjects were enrolled in this study. Participants were asked to perform 3 trials: 4 repetitions of bodyweight squats (L0), 4 repetitions of 10 kg barbell back loaded squats (L10), 4 repetitions of 20 kg barbell back loaded squats (L20). During the unloaded and loaded (L10, L20) squats, vibroarthrographic signals were collected using an accelerometer placed on the patella and were described by the following parameters: variation of mean square (VMS), mean range (R4), and power spectral density for frequency of 50-250 Hz (P1) and 250-450 Hz (P2).
Results: Obtained results showed that the lowest values were noted in the unloaded condition and that the increased applied loads had a significant concomitant increase in all the aforementioned parameters bilaterally (p<0.05).
Conclusion: This phenomenon indicates that the application of increasing knee loads during squats corresponds to higher intensity of vibroacoustic emission, which may result in higher contact stress and kinetic friction as well as diminished arthrokinematic motion quality.
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On 27 Aug, 2020
On 21 Aug, 2020
On 21 Aug, 2020
On 17 Aug, 2020
Received 03 Aug, 2020
On 13 Jul, 2020
Invitations sent on 13 Jul, 2020
On 13 Jul, 2020
On 12 Jul, 2020
On 12 Jul, 2020
Posted 11 May, 2020
On 12 Jun, 2020
Received 09 Jun, 2020
Received 25 May, 2020
On 19 May, 2020
On 13 May, 2020
Invitations sent on 09 May, 2020
On 04 May, 2020
On 03 May, 2020
On 02 May, 2020
Vibroarthrographic analysis of patellofemoral joint arthrokinematics during squats with increasing external loads
On 27 Aug, 2020
On 21 Aug, 2020
On 21 Aug, 2020
On 17 Aug, 2020
Received 03 Aug, 2020
On 13 Jul, 2020
Invitations sent on 13 Jul, 2020
On 13 Jul, 2020
On 12 Jul, 2020
On 12 Jul, 2020
Posted 11 May, 2020
On 12 Jun, 2020
Received 09 Jun, 2020
Received 25 May, 2020
On 19 May, 2020
On 13 May, 2020
Invitations sent on 09 May, 2020
On 04 May, 2020
On 03 May, 2020
On 02 May, 2020
Background: The patellofemoral joint (PFJ) provides extremely low kinetic friction, which results in optimal arthrokinematic motion quality. Previous research showed that these friction-reducing properties may be diminished due to the increase in articular contact forces. However, this phenomenon has been not analyzed in vivo during functional daily-living activities. The aim of this study was the vibroarthrographic assessment of changes in PFJ arthrokinematics during squats with variated loads.
Methods: Fifty-seven asymptomatic subjects were enrolled in this study. Participants were asked to perform 3 trials: 4 repetitions of bodyweight squats (L0), 4 repetitions of 10 kg barbell back loaded squats (L10), 4 repetitions of 20 kg barbell back loaded squats (L20). During the unloaded and loaded (L10, L20) squats, vibroarthrographic signals were collected using an accelerometer placed on the patella and were described by the following parameters: variation of mean square (VMS), mean range (R4), and power spectral density for frequency of 50-250 Hz (P1) and 250-450 Hz (P2).
Results: Obtained results showed that the lowest values were noted in the unloaded condition and that the increased applied loads had a significant concomitant increase in all the aforementioned parameters bilaterally (p<0.05).
Conclusion: This phenomenon indicates that the application of increasing knee loads during squats corresponds to higher intensity of vibroacoustic emission, which may result in higher contact stress and kinetic friction as well as diminished arthrokinematic motion quality.
Figure 1
Figure 2
Figure 3