Authors evaluated the impact of a soft knee brace on objectively assessed dynamic knee instability in persons with knee osteoarthritis (OA). They also ascertained the difference in impact between a non-tight and a tight soft knee brace in these persons. Via this study, it was reported for the first time that objectively assessed dynamic knee instability is reduced by wearing a soft knee brace in persons with knee OA. Objective improvement of knee instability beyond subjectively reported improvement is resulted by wearing a soft brace.