DISC PROSTHESIS

摘要

A disc prosthesis (4) suitable to be interposed in a seat (22) being defined between an upper vertebral body (20) and a lower vertebral body (18) which are contiguous to each other, said prosthesis (4) comprising an upper plate (12) fittedly associable to the upper vertebral body (20) and a lower plate (8) fittedly associable to the lower vertebral body (18). The lower (8) and upper (12) plates are coupled to each other according to a coupling of substantially spherical surfaces having different bending radiuses (R', R''), such as to provide a rotary-translatory coupling.