Medial hamstring muscle activation patterns are affected 1–6 years after ACL reconstruction using hamstring autograft

Purpose Although changes in hamstring muscle morphology after anterior cruciate ligament reconstruction (ACLR) using a semitendinosus autograft hamstrings-gracilis (HG) of the ipsilateral limb are recognized, alterations in muscle activation patterns have not been extensively studied. The purpose of...

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Bibliographic Details
Published in:Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA sports traumatology, arthroscopy : official journal of the ESSKA, 2014-05, Vol.22 (5), p.1024-1029
Main Authors: Árnason, Stefán Magni, Birnir, Bjartmar, Guðmundsson, Tómas Emil, Guðnason, Garðar, Briem, Kristín
Format: Article
Language:English
Subjects:
Adult
Anterior Cruciate Ligament - surgery
Anterior Cruciate Ligament Reconstruction
Athletes
Autografts
Electromyography
Exercise Therapy
Female
Humans
Knee
Knee - physiopathology
Knee - surgery
Knee Injuries - physiopathology
Knee Injuries - rehabilitation
Knee Injuries - surgery
Knee Joint - physiopathology
Knee Joint - surgery
Ligaments
Male
Medicine
Medicine & Public Health
Muscle Contraction
Muscle, Skeletal - physiology
Orthopedics
Rehabilitation
Soccer - injuries
Sports injuries
Surgery
Surgical outcomes
Thigh
Young Adult
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Summary:Purpose Although changes in hamstring muscle morphology after anterior cruciate ligament reconstruction (ACLR) using a semitendinosus autograft hamstrings-gracilis (HG) of the ipsilateral limb are recognized, alterations in muscle activation patterns have not been extensively studied. The purpose of this controlled laboratory trial was therefore to monitor muscle activation levels of the medial (MH) and lateral (LH) hamstring muscles in athletes who had undergone ACLR using a HG autograft and to contrast these to activation levels demonstrated by healthy controls. Methods Surface electromyography (EMG) was sampled from bilateral hamstring muscles of 18 athletes 1–6 years after ACLR and 18 matched controls (CTRL) during the performance of two dissimilar exercises, both involving eccentric knee flexor activity. Peak normalized muscle activation levels were identified for MH and LH of both limbs during the performance of the Nordic Hamstring (NH) exercise and TRX ® hamstring curl (TRX) exercise. Results A statistically significant limb by exercise interaction was found for peak activation levels of LH, due to significant interlimb differences in activation during the performance of the TRX exercise compared to more symmetrical activation during the NH ( p  
ISSN:0942-2056
1433-7347
DOI:10.1007/s00167-013-2696-4