Abstract
It is yet not known whether the variation in knee orthotics pressure would lead to changes in muscle activity during-sit-to-stand postural transition in patients with knee osteoarthritis (OA). Participants in this analytical study were patients with knee OA. The research design was a cross-sectional study. They were enrolled in the study through a sample of convenience method. The primary outcome measure was surface electromyography for measuring muscle activity while changing knee orthotics pressure during sit-to-stand motion. Data were summarized with mean and standard deviation while Friedman’s test was performed for multiple comparison of variables, at a significance level of p = 0.05. Seven elderly patients with knee osteoarthritis (mean age 71.4 ± 11.8 years) participated in the study. Moderate orthotics (7.3 mmHg) led to a significant increase in the percentage maximum voluntary contraction (MVC) of tibialis anterior compared to that obtained without orthotics. Rectus femoris, vastus medialis, vastus lateralis, and biceps femoris tended to increase the % MVC with an increase in wearing pressure. It was therefore concluded that the muscle activity during sit-to-stand motion could be increased in patients with knee osteoarthritis by wearing flexible orthotics with varying pressure.
Highlights
When Grade 2 or higher was diagnosed in the knee osteoarthritis, it was regarded as knee OA
In this study, we investigated whether muscle activity during sit-to-stand motion of the knee would be affected by variations in orthosis wearing pressure
We found that the tibialis anterior (TA) activity was significantly reduced with Moderate orthotics wearing pressure compared with that of the control
Summary
The increase in the aged population is often accompanied by high prevalence rate of age-related degenerative diseases such as knee osteoarthritis (OA). ROAD (Research on Osteoarthritis/Osteoarthrosis Against Disability) project conducted in 2005, the prevalence of knee OA was 54.6% (42.0% for male and 61.5% for female) [2]. This study was conducted in Japan with 3040 participants in the survey. The radiographic degree or presence was diagnosed using X-ray images of 3040 participants in the baseline survey of the ROAD study. The KL classification (Kellgren–Lawrence grading system), which is a severity classification based on the X-ray image of knee OA, is classified by an orthopedic surgeon, and the KL classification is performed on at least one knee joint of the left and right knees. When Grade 2 or higher was diagnosed in the knee osteoarthritis, it was regarded as knee OA
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