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.fr/patents/US20050131537?utm_source=gb-gplus-shareBrevet US20050131537 - Spinal facet joint implant
