Superior and/or inferior facets of one or more facet joints may be replaced by superior and/or inferior facet joint prostheses. In one embodiment, a kit of superior or inferior prostheses is provided, in which the prostheses have at least two dimensions that vary among members of the kit independently...http://www.google.de/patents/US20090030461?utm_source=gb-gplus-sharePatent US20090030461 - Spinal Facet Joint Implant
