The effect of knee brace on electrical activity mosculs of lower limb in genu valgus persens during walking

Jafarnezhadgero, AmirAli The effect of knee brace on electrical activity mosculs of lower limb in genu valgus persens during walking. University of Mohaghegh Ardabili.

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Abstract

Background & Purpose: Different factors effect of walking and disturb the balance and maintain the posture. Crossed knee is one of the most important lower limb malformations that affects the body's direction and disrupts the posture. The purpose of the present study was to investigate effect of using short-term knee brace on the electromyography frequency spectrum of lower limbs in the person with genu valgum during walking. Methodology: This research was of a semi-experimental and a laboratory type. 24 boys with genu valgum (20-30 years old) volunteered to participate in the study. The medical rehabilitation knee brace of TEB O SANAT was used. The electrical activity of the selected muscles was recorded by electromyography device (datalite biometrics ltd, uk). Paired t-test was used for statistical analysis at a significance level of 0.05. Results: The findings of the present study showed a significant increase in electrical activity of the semitendinosus muscle during walking with knee brace compared to walking conditions without knee brace (p = 0.037, d = 0.89). The frequency spectrum of electrical activity of other lower limb muscles did not show any significant difference during short-term use of knee brace (P <0.05). The findings of the present study showed a significant decrease in the electrical activity of the gluteus medius muscles during the heel contact, mid Stans and push off phases. Also the electrical activity of the vastus medialis muscles (d = 1.52 P = 0.001), vastus lateralis muscles (d = 1.16 P = 0.009) and semitendinosus muscle (1.85 P = 0.001) d) also showed a significant decrease during the gait phase. Conclusion: Significant increase in the frequency spectrum of electrical activity of the semitendinosus muscle means delaying the fatigue of this muscle and indicating improvement in the function and activity of this muscle, which is due to the effect of knee joint pulled and weakened. Significant decrease due to increased activity and shortening of the vastus lateralis in person with genu vagom can be a positive result in improving or preventing the increase of this malaligment. Also, the electrical activity of the gluteus medius muscles showed a decrease in the use of knees brace. Based on the results, we can design a knee brace that can increase the activity of the weakened muscles and make them more active.

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