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1. A knee brace having an upper part securable about a user's thigh and a lower part securable about the user's lower leg, the upper and lower parts secured together by a hinge, characterized in that an elongate flexible tensioning element extends between the upper part and the lower part over a lobe which is secured to the upper part adjacent to the hinge such that pivoting of the upper part relative to the lower part about the hinge causes tension in the elongate flexible tensioning element and wherein the lobe is shaped to cause the tension to dynamically increase as the upper part is pivoted relative to the lower part, wherein the lobe defines an involute curved surface about its periphery, wherein the knee brace further comprises a calf supporting member, and wherein the elongate flexible tensioning element is secured to the calf supporting member, and wherein the calf supporting member is hingedly secured to an operatively lower portion of the lower part by a pivot member, and the elongate flexible tensioning element is configured to urge the calf supporting member to pivot about the pivot member in an anterior direction.
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