Virtual platform composed by two modules, a first module for the virtual pre-surgery simulation of a prosthesis surgery of the lumbosacral area of the human spine and a second module for the bio-mechanic validation of the simulated surgery, based on techniques of analysis to the finite elements. The platform comprises a device for navigating in 3D environment with 6 degrees of freedom and a robotized arm with 6 degrees of freedom for the prosthesis implantation visualized on the monitor with an avatar of the surgical instrument apt to manipulate the single prosthesis.