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| Number | Title | Issue Date |
| 7955280 | Leg alignment for surgical parameter measurement in hip replacement surgery A CAS system and method comprises a first reference in fixed relation with the pelvis and a registration tool. A sensor apparatus tracks the first reference and tool. A controller unit receives tracking data for the first reference and tool. A calculator tracks the ... | 06/07/2011 |
| 7412777 | Method and apparatus for calibrating spherical objects using a computer system A method of determining a center of curvature of the spherical outer surface of an object using a computer system is provided. The method includes defining at least one contact region on the spherical outer surface in a plane substantially tangential to a circumfere... | 08/19/2008 |
| 7302355 | Method and apparatus for calibrating circular objects using a computer tracking system A method of calibrating a circular portion of an object, such as to determine the center point of the object, is provided. The method includes determining spatial coordinates of at least two points on a circumferential edge of the circular portion of the object, and... | 11/27/2007 |
