A knee brace assembly with a proximal compression system adapted to be secured to the thigh and a distal compression system adapted to be secured to the calf. The brace includes lateral and distal hinge assemblies connecting the proximal compression system and the distal compression system to permit rotational movement of the proximal compression system with respect to the distal compression system. At least one inelastic strap extends around the proximal compression system and the distal compression system. The strap is leveraged to tighten the proximal compression system and the distal compression system to compress soft tissue in the thigh and calf when the leg is extended, but to release the proximal compression system and the distal compression system when the leg is in flexion.