The effect of using Graded knee brace at two angles of 60 and 30 degrees on the components of ground reaction forces in individuals with genu valgum during landing

Valizadehorang, Aidin The effect of using Graded knee brace at two angles of 60 and 30 degrees on the components of ground reaction forces in individuals with genu valgum during landing. University of Mohaghegh Ardabili.

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Abstract

Background & Purpose: One of the most common malalignments of the knee joint is the genu valgus than its prevalence is high among our people. The purpose of this study was to investigate the effect of using Graded knee brace at two angles of 60 and 30 degrees on the components of ground reaction forces in individuals with genu valgus during landing. Methodology: This research was of a semi-experimental and a laboratory type. Twenty boys with genu valgus (20-30 years old) were volunteered. The knee brace of graded rehabilitation of Teb o Sanat was used in two angles of knee flexion with two angles of 60 and 30 degrees. Landing on a platform of 40 cm on a force plate in three conditions without brace, with a brace at 60 and 30 degrees. The Bertec force plate (Bertec Corporation, Columbus, OH, USA) was used to record ground reaction forces. The statistical analysis of Repeated Measures was used in SPSS V25 software with significance level of 0.05. Results: The findings of this study indicated that vertical and heel contact phase showed a significant decrease between the two landing conditions without brace and with brace at a 60-degree angle of 15.21% (P = 0.007; mid effect size). Also, the force in the medio-latral direction during the heel contact phase and between two landing conditions with two angles of 60 degrees and 30 degrees showed a significant increase of 27.18 percent (P=0.026; high effect effect). The frequency component with a power of 99.5% in the medio-latral direction (P = 0.02; high effect effect) and vertical direction (P = 0.075; high effect effect) showed a significant decrease It's possible. Also, the median frequency component in the medio-latral direction (P = 0.019; low effect size) and in the anterior-posterior direction (P = 0.019; high effect effect) showed a significant decrease. Conclusion: Regarding the median frequency reduction after using the knee brace during landing, it is maybe to be effective in the improvement of vibrations in the neuromuscular components and reduce of them. Also, the frequency component has been reduced by a power of 5.99% after using the knee brace. Reducing this component by increasing the knee brace at angles of flexion constraints could increase joint stability during landing in individuals with genu valgum. According to the results of this study, it can be concluded that due to reduction of vertical force during landing with a brace at 60 degrees, the calibrated knee brace can reduce the forces of the lower limbs when landing, the best angle of limiting this brace 60 the degree has led to a decrease in this force. However, due to the medio-latral force during the descent with the brace at 60 degrees and 30 degrees, it can be said that by decreasing the knee flexion angle, the forces of the lower extremities increase, which increases the risk of injury in the knee joint and especially Increases the risk of anterior cruciate ligament (ACL).

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