Vibroarthrographic analysis of patellofemoral joint arthrokinematics during squats with increasing external loads
| Autor: | Daniel Puciato, Kevin G. Laudner, Dawid Bączkowicz, Ewelina Ołowiana, Noelle M. Selkow |
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| Rok vydání: | 2020 |
| Předmět: |
Kinetic friction
Mean square Friction Physical Therapy Sports Therapy and Rehabilitation Patellofemoral joint Squat Knee Joint Contact stress 03 medical and health sciences 0302 clinical medicine Crepitus Medicine Orthopedics and Sports Medicine Biomechanics 030212 general & internal medicine lcsh:Sports medicine Orthodontics business.industry Rehabilitation 030229 sport sciences Knee joint Intensity (physics) Articular contact business lcsh:RC1200-1245 Research Article |
| Zdroj: | BMC Sports Science, Medicine and Rehabilitation, Vol 12, Iss 1, Pp 1-9 (2020) BMC Sports Science, Medicine and Rehabilitation |
| DOI: | 10.21203/rs.3.rs-21513/v3 |
| Popis: | 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 not been 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 114 knees from 57 asymptomatic subjects (23 females and 34 males) whose ages ranged from 19 to 26 years 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 Conclusion This phenomenon indicates that the application of increasing knee loads during squats corresponds to higher intensity of vibroacoustic emission, which might be related to higher contact stress and kinetic friction as well as diminished arthrokinematic motion quality. |
| Databáze: | OpenAIRE |
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