1. A method of manufacturing an arthroplasty jig, the method comprising: a). generate a bone model, wherein the bone model includes a three dimensional computer model of at least a portion of a joint surface of a bone of a patient joint to undergo an arthroplasty procedure; b). generate an implant model, wherein the implant model includes a three dimensional computer model of at least a portion of a joint surface of an arthroplasty implant to be used in the arthroplasty procedure; c.) assess a characteristic associated with the patient joint; d.) generate a modified joint surface of the implant model by modifying at least a portion of a joint surface of the implant model according to the characteristic; and e.) shape match the modified joint surface of the implant model and a corresponding joint surface of the bone model.