A dynamic stabilization device, system, and method for use with a spinal motion segment includes a first bone anchor assembly, a second bone anchor assembly, a first articulation element and a second articulation element. The first articulation element includes an end portion engageable with the first...http://www.google.com/patents/US8206419?utm_source=gb-gplus-sharePatent US8206419 - Systems and devices for dynamic stabilization of the spine
