An artificial functional spinal unit including an expandable intervertebral implant that can be inserted via a posterior surgical approach and used with one or more facet replacement devices to provide an anatomically correct range of motion is described. Lordotic and non-lordotic expandable, articulating...http://www.google.com/patents/US20050273173?utm_source=gb-gplus-sharePatent US20050273173 - Expandable articulating intervertebral implant with cam
