| 摘要 |
An arrangement for interoperative determination of the spatial position and angular position of an articular joint replacement implant, especially the socket of a hip or shoulder joint or an associated shaft implant, or a vertebral body replacement implant, especially a lumbar vertebral or neck vertebral implant, using a computer tomographical method, comprising a device for forming a computer graphic model in order to produce and store a three-dimensional image of an area of a joint or vertebra which is to be provided with the joint replacement implant, an optical coordinate measuring device for the provision of real position coordinates of a defined real or virtual point of the area of the joint or vertebra and/or of location-relating vectors between such points inside the area of the joint or vertebra or therefrom to joint-functional relevant points at an extremity outside the area of the joint or vertebra, whereby the coordinate measuring device comprises a stereo camera or a stereo camera arrangement for spatial detection of transmitter signals, at least one multipoint transmitter comprising a group of rigidly interbound measuring points, and an evaluation unit for evaluating amounts of measuring point coordinates supplied by the multipoint transmitter(s) and detected by the stereo camera, in addition to a matching processing unit for adapting the real position of the image to the real current spatial position of the area of the joint or vertebra by means of the real position coordinates of the defined points, whereby the matching processing unit is configured in such a way that the transformation parameters can be calculated by minimizing the distances of the normals. |
