Objective:To investigate the biomechanical changes in knee kinematics before and after wearing knee sportsunloading brace,and the mechanism of providing a protection for knee injuries in the active population.Method:Thirty healthy university students were enrolled and gait analysis was performed using a portableknee motion analysis system under the condition of jogging on a treadmill at a speed of 5 km/h. The changesin knee kinematics before and after wearing the sports brace were compared,including the changes in theproximal-distal translation,internal-external translation,anterior-posterior translation,flexion-extension angle,ab-duction-adduction rotation,internal-external rotation of the knee joint during the stance phase and swing phaseof a gait cycle.Result:During the stance phase,wearing the knee sports unloading brace significantly increased the proximal-distal translation of the knee by 3.4 mm,decreased the abduction-adduction rotation by 2.8°,and significantlydecreased the internal-external translation,anterior-posterior translation,flexion-extension angle and interna-ex-ternal rotation. During the swing phase,wearing the knee sports unloading brace significantly increased theproximal-distal translation of the knee by 8.7 mm and decreased the abduction-adduction rotation by 3.5°,withsignificant reductions in the flexion-extension angle and internal-external rotation. However,changes in anterior-posterior translation (P=0.49) and internal-external translation (P=0.86) were not significant.Conclusion:During the stance phase (primary loading phase),the knee sports unloading brace effectively sup-ports the knee joint and enhances its stability by increasing the proximal-distal translation and restricting the joint mobility. The stabilization effect during the swing phase is relatively weaker compared to the stance phase.
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