A knee brace incorporates an upper attachment assembly having an upper cuff with medial and lateral struts extending therefrom and a lower attachment assembly having a lower cuff with lower medial and lateral struts extending therefrom. The upper and lower medial struts are connected proximate a user's knee by a medial hinge assembly and the upper and lower lateral struts are connected proximate the user's knee by a lateral hinge assembly. At least one of the struts includes a mechanism dynamically extending the strut with respect to a rotation point of that strut in the associated hinge upon flexion of the upper and lower attachment assemblies between a flexed position and an extended position.