Various methods and devices for replacing damaged, injured, diseased, or otherwise unhealthy posterior elements, such as the facet joints, the lamina, the posterior ligaments, and/or other features of a patient's spinal column, are provided. In one exemplary embodiment, the methods and devices are effective...http://www.google.es/patents/US8070783?utm_source=gb-gplus-sharePatente US8070783 - Facet joint replacement
