A dynamic spinal implant utilizes cartilage bearing graft material in dynamic disc replacement and/or facet arthroplasty. Methods and apparatus for dynamic spinal implants incorporate bulk articular graft tissues derived from donor joint sources in human (allograft or autograft) or non-human (xenograft)...http://www.google.de/patents/US7662183?utm_source=gb-gplus-sharePatent US7662183 - Dynamic spinal implants incorporating cartilage bearing graft material
