A cup for a hip replacement is disposed in a first relationship in an operating room with an object providing a sighting for the cup rotation in a first plane. The cup is thereafter rotated in the first plane through a first angle (e.g., 20°-30°). The cup is then disposed in a planar relationship in...http://www.google.de/patents/US8034057?utm_source=gb-gplus-sharePatent US8034057 - Apparatus for, and method of, preparing for and inserting hip joint prosthesis using computer guidance
