The exoskeletal frame design broadens the usual shell and tube frame design style of prostheses. From the bone element, three rods enclosing the residual limb stem. The shaft mounting is not, as typically, placed in the lower, but in the upper and central regions, which enables a convenient modification of an adjustable angle. The product concept of the space frame allows a controlled damping, cushioning and torsion movements of the complete system. The product does not imitate, but interprets the lost limb.