A hip prosthesis includes a stem intended to be inserted in the neck of the femur, a prosthetic head shaped as a substantially hemispherical cup, intended to be inserted in the acetabular seat, a distal prosthetic component connected to the stem and shaped as a substantially hemispherical cup with concavity towards the concavity of the prosthetic head, and a ball disposed between the distal prosthetic component and the prosthetic head in such manner to generate a ball coupling, wherein the prosthetic head includes a flattened pole that defines an external central flat planar surface in order to adjust to various shapes of the acetabular seat, grooves externally obtained to be coupled with the acetabular seat and holes to receive screws that are screwed into the acetabular seat.
