The Freedom Lumbar Disc replacement from AxioMed comprises metal endplates which are porous coated with titanium beads for osteointegration and a viscoelastic polymer (silicone polycarbonate urethane polymer) articulation.  The device is undergoing clinical trials . 

The LP-ESP disc prosthesis is composed of two titanium plates with a polycarbonate urethane in which there is a silicone core loaded with compressible beads. The titanium end plates have raised teeth and a porous, rough hydroxyapatite coating. The elastomer core is manufactured from DSM...

The DISCOVER Artificial Cervical Intervertabral Disc arthroplasty from Depuy is an unconstrained cervical disc prosthesis. The device is indicated for symptomatic cervical disc disease, with the aim of improving range of neck movement and reducing neck pain. The device comprises titanium alloy...

The PRESTIGE LP Cervical Disc Replacement from Medtronic is a titanium ceramic composite device with two articulating components. The device is an evolution of the Bristol/Cummings disc first implanted in 1991. Fixation is with anterior screws.  Clinical trials are ongoing.

The XL TDR from NuVasive is an investigational intervertebral disc replacement which is implanted using a lateral approach to the lumbar spine. The device has CoCrMo endplates and a ball and socket articulation. A clinical trial is ongoing. As an investigational device, it is not yet...