Abstract: An intervertebral disc prosthesis comprising two opposing plates and a flexible seal extending between the two opposing plates for forming a closed chamber between the two plates, the flexible seal being adapted to enable the plates to move relative to one another. The disc prosthesis also includes a compressible body disposed in the closed chamber and located between the plates. The compressible body has a first surface in contact with a face of one of the plates, whereby an area of contact between the first surface of the compressible body and the face of the one of the plates increases when compressive forces are exerted upon the compressible body.