A system for guiding an implant to an optimal placement within a patient includes a trajectory guide for guiding instruments along a selected trajectory and a trajectory fixation device for fixing the trajectory guide in a selected position. The trajectory guide defines a path configured to align with...http://www.google.co.uk/patents/US8016835?utm_source=gb-gplus-sharePatent US8016835 - Rigidly guided implant placement with control assist
