1. A method for an arthroplasty procedure for a patient bone in an arthroplasty target area, the method comprising: receiving scan data associated with a portion of the patient bone corresponding to the arthroplasty target area, the scan data captured using a medical imaging system; generating a 3D model of the portion of the patient bone from a golden template that has been modified using the scan data, the golden template being associated with a known good bone; generating preoperative planning data from the model, the preoperative planning data specifying a location and an orientation of a treatment to the arthroplasty target area, the treatment preparing the arthroplasty target area for an arthroplasty implant to repair at least a portion of a joint associated with the portion of the patient bone; and guiding one or more machines with a computer using the preoperative planning data.