An orthopaedic device (1) for the mobile connection of a first and a second bony segment (4, 5) of an organic device for cooperating with or substituting a natural articulation comprising a first working surface (9) related to the first cooperating segment (4) with a second working surface (10) related to the second bony segment (5) in order to constrain (guide) the relative motion between the said bony segments (4, 5)； the first and the second working surface (9, 10) are respectively practically shaped as the axodes of the relative motion of a first and a second link of a linkage practically equivalent to the natural articulation； in particular the first and the second link are corresponding, in the linkage, to the first and the second bony segment (4, 5).
