An intervertebral implant includes an essentially tubular body which is made from a biocompatible solid material. The architecture includes a content provider and a consumer system for requesting content from the content provider. A suction cup clamp mechanism is coupled to one of the two part-spherical couplers, and a retention being coupled to a different one of the two part-spherical couplers. In another embodiment, the height of the keys is alternated across individual columns of keys. The knob is operable between a folded position and an extended position.