Patent ID: 7877131

Claim:
A computer-assisted surgery system for guiding an operator in altering a pelvis for a subsequent insertion of a pelvic implant, comprising: a sensing apparatus configured to track a reference tool securable to the pelvis and a bone altering tool at least in orientation; a position calculator for calculating at least an orientation of a pelvic frame of reference as a function of a tracking of the reference tool, and for calculating at least an orientation of the bone altering tool with respect to the frame of reference when altering the pelvis; a source of posture data being a tool digitizing a plane related to a given posture of the patient; a posture data correction calculator operative to provide a display of information comprising the frame of reference corrected based on said posture data from the source of posture data when altering the pelvis; and a display unit for displaying said display of information and the orientation of the bone altering tool with respect to the pelvic frame of reference.