A knee brace having an upper part securable about a user's thigh and a lower part securable about the user's lower leg is provided. The upper and lower parts are secured together adjacent the user's knee by a hinge. The knee brace is characterised in that a flexible tensioning element extends between the upper part and the lower part over a lobe which is secured to the upper part adjacent the hinge such that pivoting of the upper and lower parts about the hinge causes the flexible element to engage the lobe about its periphery to cause tension in the flexible 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.
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