Ankle perturbation generates bilateral alteration of knee muscle onset times after unilateral anterior cruciate ligament reconstruction
Background The aim of this study was to compare muscle activation onset times of knee muscles between the involved and uninvolved knee of patients with unilateral anterior cruciate ligament reconstruction (ACLR), and the uninjured knees of healthy subjects after a controlled perturbation at the ankl...
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PeerJ Inc.
2018-07-01
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| author | Patricio A. Pincheira Rony Silvestre Susan Armijo-Olivo Rodrigo Guzman-Venegas |
| author_facet | Patricio A. Pincheira Rony Silvestre Susan Armijo-Olivo Rodrigo Guzman-Venegas |
| author_sort | Patricio A. Pincheira |
| collection | DOAJ |
| description | Background The aim of this study was to compare muscle activation onset times of knee muscles between the involved and uninvolved knee of patients with unilateral anterior cruciate ligament reconstruction (ACLR), and the uninjured knees of healthy subjects after a controlled perturbation at the ankle level. Methods Fifty male amateur soccer players, 25 with unilateral ACLR using semitendinosus-gracilis graft (age = 28.36 ± 7.87 years; time after surgery = 9 ± 3 months) and 25 uninjured control subjects (age = 24.16 ± 2.67 years) participated in the study. Two destabilizing platforms (one for each limb) generated a controlled perturbation at the ankle of each participant (30°of inversion, 10°plantarflexion simultaneously) in a weight bearing condition. The muscle activation onset times of semitendinosus (ST) and vastus medialis (VM) was detected through an electromyographic (EMG) analysis to assess the neuromuscular function of knee muscles. Results Subjects with ACLR had significant delays in EMG onset in the involved (VM = 99.9 ± 30 ms; ST = 101.7 ± 28 ms) and uninvolved knee (VM = 100.4 ± 26 ms; ST = 104.7 ± 28 ms) when compared with the healthy subjects (VM = 69.1 ± 9 ms; ST = 74.6 ± 9 ms). However, no difference was found between involved and uninvolved knee of the ACLR group. Discussion The results show a bilateral alteration of knee muscles in EMG onset after a unilateral ACLR, responses that can be elicited with an ankle perturbation. This suggests an alteration in the central processing of proprioceptive information and/or central nervous system re-organization that may affect neuromuscular control of knee muscles in the involved and uninvolved lower limbs. |
| first_indexed | 2024-03-09T06:51:14Z |
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| issn | 2167-8359 |
| language | English |
| last_indexed | 2024-03-09T06:51:14Z |
| publishDate | 2018-07-01 |
| publisher | PeerJ Inc. |
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| series | PeerJ |
| spelling | doaj.art-7cdec780ae0747f8b94eb49c24190e592023-12-03T10:27:33ZengPeerJ Inc.PeerJ2167-83592018-07-016e531010.7717/peerj.5310Ankle perturbation generates bilateral alteration of knee muscle onset times after unilateral anterior cruciate ligament reconstructionPatricio A. Pincheira0Rony Silvestre1Susan Armijo-Olivo2Rodrigo Guzman-Venegas3Escuela de Kinesiología, Facultad de Ciencias, Universidad Mayor, Santiago, ChileUnidad de Biomecánica Deportiva, Clinica Meds, Santiago, ChileDepartment of Physical Therapy, Faculty of Rehabilitation Medicine, University of Alberta, Edmonton, CanadaLaboratorio Integrativo de Biomecánica y Fisiología del Esfuerzo (LIBFE), Escuela de Kinesiología, Facultad de Medicina, Universidad de los Andes, Santiago, ChileBackground The aim of this study was to compare muscle activation onset times of knee muscles between the involved and uninvolved knee of patients with unilateral anterior cruciate ligament reconstruction (ACLR), and the uninjured knees of healthy subjects after a controlled perturbation at the ankle level. Methods Fifty male amateur soccer players, 25 with unilateral ACLR using semitendinosus-gracilis graft (age = 28.36 ± 7.87 years; time after surgery = 9 ± 3 months) and 25 uninjured control subjects (age = 24.16 ± 2.67 years) participated in the study. Two destabilizing platforms (one for each limb) generated a controlled perturbation at the ankle of each participant (30°of inversion, 10°plantarflexion simultaneously) in a weight bearing condition. The muscle activation onset times of semitendinosus (ST) and vastus medialis (VM) was detected through an electromyographic (EMG) analysis to assess the neuromuscular function of knee muscles. Results Subjects with ACLR had significant delays in EMG onset in the involved (VM = 99.9 ± 30 ms; ST = 101.7 ± 28 ms) and uninvolved knee (VM = 100.4 ± 26 ms; ST = 104.7 ± 28 ms) when compared with the healthy subjects (VM = 69.1 ± 9 ms; ST = 74.6 ± 9 ms). However, no difference was found between involved and uninvolved knee of the ACLR group. Discussion The results show a bilateral alteration of knee muscles in EMG onset after a unilateral ACLR, responses that can be elicited with an ankle perturbation. This suggests an alteration in the central processing of proprioceptive information and/or central nervous system re-organization that may affect neuromuscular control of knee muscles in the involved and uninvolved lower limbs.https://peerj.com/articles/5310.pdfSurface electromyographyAnterior cruciate ligament reconstructionProprioceptionNeuromuscular control |
| spellingShingle | Patricio A. Pincheira Rony Silvestre Susan Armijo-Olivo Rodrigo Guzman-Venegas Ankle perturbation generates bilateral alteration of knee muscle onset times after unilateral anterior cruciate ligament reconstruction PeerJ Surface electromyography Anterior cruciate ligament reconstruction Proprioception Neuromuscular control |
| title | Ankle perturbation generates bilateral alteration of knee muscle onset times after unilateral anterior cruciate ligament reconstruction |
| title_full | Ankle perturbation generates bilateral alteration of knee muscle onset times after unilateral anterior cruciate ligament reconstruction |
| title_fullStr | Ankle perturbation generates bilateral alteration of knee muscle onset times after unilateral anterior cruciate ligament reconstruction |
| title_full_unstemmed | Ankle perturbation generates bilateral alteration of knee muscle onset times after unilateral anterior cruciate ligament reconstruction |
| title_short | Ankle perturbation generates bilateral alteration of knee muscle onset times after unilateral anterior cruciate ligament reconstruction |
| title_sort | ankle perturbation generates bilateral alteration of knee muscle onset times after unilateral anterior cruciate ligament reconstruction |
| topic | Surface electromyography Anterior cruciate ligament reconstruction Proprioception Neuromuscular control |
| url | https://peerj.com/articles/5310.pdf |
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