Postural control and thigh muscle activity in men with knee osteoarthritis

Abstract The aim of this study was to examine the standing balance and the function of vastus medialis (VM) and biceps femoris (BF) muscles with surface electromyography (EMG). Fifty-four subjects with uni- or bilateral knee osteoarthritis (OA) (aged 50–69 years) and 53 age-matched randomly selected...

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Bibliographic Details
Published in:Journal of electromyography and kinesiology 2010-12, Vol.20 (6), p.1066-1074
Main Authors: Lyytinen, Tarja, Liikavainio, Tuomas, Bragge, Timo, Hakkarainen, Marko, Karjalainen, Pasi A, Arokoski, Jari P.A
Format: Article
Language:English
Subjects:
Aged
Electromyography
Humans
Knee
Male
Middle Aged
Muscle, Skeletal - physiopathology
Osteoarthritis
Osteoarthritis, Knee - diagnostic imaging
Osteoarthritis, Knee - physiopathology
Physical Medicine and Rehabilitation
Postural control
Posture - physiology
Quadriceps Muscle - physiopathology
Radiography
Random Allocation
Thigh
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Summary:Abstract The aim of this study was to examine the standing balance and the function of vastus medialis (VM) and biceps femoris (BF) muscles with surface electromyography (EMG). Fifty-four subjects with uni- or bilateral knee osteoarthritis (OA) (aged 50–69 years) and 53 age-matched randomly selected clinically and radiologically healthy men participated in this study. Postural control was assessed on a force platform with a bipedal stance with eyes open (EO) and closed (EC) and a monopedal stance with EO. The balance parameters, mean sway velocity, velocity along AP and ML axes, elliptical area, standard deviation of center of pressure, average radial displacement, mean frequency and frequency domain balance parameters and different power spectral density frequency bands were determined. Root mean square (RMS) for EMG amplitude, mean EMG frequency ( fEMG,mean ) and median EMG frequency ( fEMG,med ) of motor unit activity were calculated from the normalized EMG data. During bipedal stance with EC and EO, there were no significant differences in balance parameters between groups, but during bipedal stance with EO, the RMS in VM was about 56% higher ( p < 0.05) in subjects with knee OA than in the control subjects and the values of fEMG,mean and fEMG,med were about 48% higher ( p < 0.05) in control subjects than subjects with knee OA. It is concluded that subjects with knee OA do not have any standing balance deficit, but they do exhibit increased muscle activity in VM muscle compared to control subjects.
ISSN:1050-6411
1873-5711
DOI:10.1016/j.jelekin.2010.05.005