Patent ID: 8449551

Claim:
A method for digitizing a center of rotation of a hip joint implant with a computer-assisted surgery system, comprising: providing a device being trackable by the computer-assisted surgery system, the device being releasably coupled in a known configuration to an acetabular implant shell of the hip joint implant; tracking a pelvis implanted with the acetabular implant shell and the device; calculating at least one of a position and an orientation of the acetabular implant shell with respect to the tracking of the pelvis by relating the known configuration of the device with the tracking of the pelvis and of the device; and calculating a center of rotation of the hip joint implant using the position and/or orientation of the acetabular implant shell and a digital model of an acetabular implant liner to be inserted into the acetabular implant shell to form the hip joint implant.