Apparatuses and methods for single disc arthroplasty and multi-segmental spine replacement recreating the anterior and middle columns of the subaxial spine complete with adjacent motion segments are disclosed. The surgical implant assembly includes a first cage adapted to be rigidly attached to a first vertebra, a second cage adapted to be rigidly attached to a second vertebra, and a spinal disc replacement prosthesis positioned between the first and second cages. The spinal disc replacement prosthesis preferably includes a resilient plastic or elastomeric body having two or more adjustably fluid-filled compartments therein, the fluid-filled compartments each being adjustably fluid filled by a respective port defined in the prosthesis body.
