Methods and devices are provided for replacing damaged, injured, diseased, or otherwise unhealthy elements of the spinal three-joint complex, such as the facet joints and discs. In one exemplary embodiment, a joint replacement system includes a facet replacement component that is adapted to replace and/or...http://www.google.com.hk/patents/US7819900?utm_source=gb-gplus-share專利 US7819900 - Tri-joint implant methods
