Spinal apparatus including reference structure spatially fixed relative to a plurality of pedicle screws that are mounted in adjacent vertebrae of a patient, and a device connected to the reference structure which is adapted to install an anterior spinal prosthesis, wherein the reference structure defines...http://www.google.de/patents/US20060241642?utm_source=gb-gplus-sharePatent US20060241642 - Inserting anterior and posterior spinal prostheses
