Ankle perturbation generates bilateral alteration of knee muscle onset times after unilateral anterior cruciate ligament reconstruction

PeerJ

article

Patricio A. Pincheira¹  Rony Silvestre³  Susan Armijo-Olivo⁴  Rodrigo Guzman-Venegas⁵ 

[1] Escuela de Kinesiología, Facultad de Ciencias, Universidad Mayor;Centre for Sensorimotor Performance, School of Human Movement and Nutrition Sciences, University of Queensland;Unidad de Biomecánica Deportiva, Clinica Meds;Department of Physical Therapy, Faculty of Rehabilitation Medicine, University of Alberta;Laboratorio Integrativo de Biomecánica y Fisiología del Esfuerzo ,(LIBFE), Escuela de Kinesiología, Facultad de Medicina, Universidad de los Andes

关键词: Surface electromyography;    Anterior cruciate ligament reconstruction;    Proprioception;    Neuromuscular control;   

DOI  :  10.7717/peerj.5310

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

BackgroundThe 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.MethodsFifty 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.ResultsSubjects 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.DiscussionThe 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.

【 授权许可】

CC BY