Cephalad and caudal vertebral facet joint prostheses and methods of use are provided. The prostheses provide an artificial facet joint structure including an artificial articular configuration unlike the preexisting articular configuration. The radii and material stress values of the prostheses are configured...http://www.google.de/patents/US6974478?utm_source=gb-gplus-sharePatent US6974478 - Prostheses, systems and methods for replacement of natural facet joints with artificial facet joint surfaces
