Preoperative planning and associated intraoperative registration for a surgical system

A method of generating implant position and orientation data for use in planning an arthroplasty procedure on a patient bone comprising a lateral femur area, proximal femur area, and a posterior femur area, the method comprising:

• obtaining patient data associated with at least a portion of the patient bone;
• generating a three-dimensional patient femur model from the patient data, the patient femur model comprising a surface boundary and a cortex region, the patient femur model being in a three-dimensional coordinate system with an X-axis in a medial-lateral direction, a Y-axis in an anterior-posterior direction with the +Y-axis pointing towards the posterior femur area, and a Z-axis in a superior-inferior direction with the +Z axis pointing towards the proximal femur area;
• obtaining a three-dimensional femoral implant model comprising an anterior flange portion having a superior edge and an anterior bone resection contact surface being planar and adjacent the superior edge;
• determining a position and orientation of the femoral implant model relative to the patient femur model;
• extending a haptic plane coplanar with the anterior bone resection contact surface, the haptic plane comprising a superior boundary positioned superior of the superior edge of the anterior flange portion of the femoral implant model;
• identifying a series of points on the superior boundary of the haptic plane;
• projecting a vector along the Y-axis from each of the series of points to a corresponding surface of the surface boundary of the patient femur model;
• determining that notching occurs based on a length and a direction of a smallest of the vectors;
• and
• generating implant component position and orientation data based on the determined position and orientation of the femoral implant model relative to the patient femur model, the implant component position and orientation data configured to be utilized by a navigation system during the arthroplasty procedure.