Abstract: A knee brace worn by a user includes an upper frame assembly having a first pair of arms coupled together by an upper strap that encircles the user's thigh, each arm in the first pair of arms having an upper housing, a lower frame assembly having a second pair of arms coupled together by a lower strap that encircles a leg portion of the user, each arm in the second pair of arms having a lower housing pivotably mounted to one of the pair of upper housings of the first pair of arms, and a pair of spring assemblies connected to the brace. Each spring assembly is disposed within one of the upper housings and one of the lower housings, and includes a torsion spring that adjusts to one of a plurality of positions to permit the spring to store mechanical energy at a desired level.