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Title: Impaired voluntary quadriceps force control following anterior cruciate ligament reconstruction: relationship with knee function.
Epworth Authors: Whitehead, Timothy
Other Authors: Perraton, Luke
Clark, Ross
Crossley, Kay
Pua, Yong-Hao
Morris, Hayden
Telianidis, Stacey
Bryant, Adam
Keywords: Musculoskeletal Clinical Institute, Epworth HealthCare, Victoria, Australia
Knee Surgery
Anterior Cruciate Ligament Reconstruction
ACL Reconstruction
Sports Medicine
Sports Injuries
Athletic Injuries
Knee Function
Muscle Activation
Quadriceps Force Control
Knee Injuries
Issue Date: Jan-2016
Publisher: Springer Link
Citation: Knee Surg Sports Traumatol Arthrosc. 2017 May;25(5):1424-1431
Abstract: PURPOSE: Impairments in quadriceps force control and altered quadriceps and hamstring muscle activation strategies have been observed following anterior cruciate ligament reconstruction; however, the functional implications of these impairments are unclear. This study examined the cross-sectional associations between quadriceps force control, quadriceps activation, hamstring coactivation and clinically assessed knee function following anterior cruciate ligament reconstruction with a hamstring graft. METHODS: Sixty-six patients (18 ± 3 months following surgery) and 41 uninjured individuals participated. Quadriceps force control was assessed using an isometric knee extension task. Participants cyclically increased and decreased quadriceps force at slow speeds between 5 and 30 % maximum voluntary isometric contraction matching a moving target displayed on a screen. Quadriceps activation and hamstring coactivation were assessed concurrently using surface electromyography. Knee function was assessed with the Cincinnati Knee Rating Scale and three single-leg hop tests. RESULTS: The reconstructed group completed the task with 48 % greater root-mean-square error (RMSE), indicating significantly worse quadriceps force control (p < 0.001). In a multivariable model adjusted for sex, greater RMSE and greater lateral hamstring coactivation were significantly associated with worse knee function that is greater odds of scoring <85 % on one or more knee functional assessment. CONCLUSIONS: Less-accurate quadriceps force output and greater hamstring coactivation are associated with worse knee joint function following anterior cruciate ligament reconstruction and may contribute to irregular knee joint loading and the onset or progression of knee osteoarthritis. Impairments in quadriceps force control and altered muscle activation strategies may be modifiable through neuromuscular training, and this is an area for future research. LEVEL OF EVIDENCE: Case-control study, Level III.
DOI: 10.1007/s00167-015-3937-5
PubMed URL:
ISSN: 1433-7347
Journal Title: Knee Surgery, Sports Traumatology, Arthroscopy
Type: Journal Article
Affiliated Organisations: Centre for Health, Exercise and Sports Medicine, Melbourne School of Physiotherapy, Faculty of Medicine Dentistry and Health Sciences, The University of Melbourne, Melbourne, Victoria, Australia
School of Exercise Science, Faculty of Health Sciences, Australian Catholic University, Melbourne, Victoria, Australia
School of Allied Health, La Trobe University, Bundoora, Victoria, Australia
Department of Physiotherapy, Singapore General Hospital, Singapore
The Park Clinic, Melbourne, Victoria, Australia
Type of Clinical Study or Trial: Cross-Sectional Study
Appears in Collections:Musculoskeletal

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