Abstract: A knee brace comprises an anterior femoral shell conforming to the shape of the upper leg of a person, an anterior tibial shell conforming to the shape of the lower leg of the person, and a posterior calf cuff conforming to the shape of the lower leg of the person. The knee brace further includes first and second mechanical hinges positioned on the medial and lateral sides of the knee of the person, respectively. The first mechanical hinge comprises an upper bar having an upper end fixedly mounted to the femoral shell and a lower end, a center link member pivotally mounted on the lower end of the femoral shell, and a lower bar having a lower end fixedly mounted to the tibial shell and an upper end pivotally mounted on the center link member.