A method for assembling a total knee prosthesis is described, wherein portions of femoral and tibial implants, which are referred to as common portions and are each attachable in a femur and in a tibia of a knee, respectively, are assembled, and interchangeable portions are selected for adjustable assembly onto said common portions for each implant, respectively, depending on the type of prosthesis desired, some for a first posterior stabilization assembly configuration, and the others for a second rotary hinge assembly configuration.
