Patient-specific augments

Abstract

A patient-specific augment can be attached to an implant component for a bone of a joint of a patient. The patient-specific augment has first and second surfaces. The first surface is a three-dimensional patient-specific surface that closely matches and can mate to a substantially unaltered and unresected surface of a bone defect of the specific patient only in one position. The second surface is designed to engage a non-custom surface of the implant.

1 . An implantable device comprising:
 a patient-specific augment attachable to an implant component for a bone of a joint of a patient, the augment having first and second surfaces, wherein the first surface is a three-dimensional patient-specific surface that closely matches and can mate to a substantially unaltered and unresected surface of a bone defect of the specific patient only in one position, and wherein the second surface is designed to engage a non-custom surface of the implant.   
     
     
         2 . The implantable device of  claim 1 , wherein the augment includes a peripheral surface between the first and second surfaces, wherein the peripheral surface is a three-dimensional surface that closely matches and can mate to a complementary surface of the bone of the specific patient. 
     
     
         3 . The implantable device of  claim 2 , wherein the augment has a patient-specific and variable depth between the first and second surfaces. 
     
     
         4 . The implantable device of  claim 3 , wherein the depth of the augment has a patient-specific step discontinuity. 
     
     
         5 . The implantable device of  claim 1 , wherein the second surface is planar. 
     
     
         6 . The implantable device of  claim 1 , wherein the second surface is piece-wise planar. 
     
     
         7 . The implantable device of  claim 1 , wherein the first surface has a porous coating and is a continuously curved surface. 
     
     
         8 . The implantable device of  claim 1 , wherein the first surface includes convex and concave portions. 
     
     
         9 . The implantable device of  claim 3 , wherein the first surface has a step discontinuity. 
     
     
         10 . The implantable device of  claim 1 , wherein the augment is a femoral augment engageable to a femoral implant of a distal femur of a knee joint of the patient. 
     
     
         11 . The implantable device of  claim 1 , wherein the augment is a tibial augment engageable to a tibial implant of a distal femur of a knee joint of the patient. 
     
     
         12 - 21 . (canceled) 
     
     
         22 . A method of preparing a knee joint for an implant component:
 preparing a bone end of a knee joint of the patient with standard resections configured to match a non-custom bone-engaging surface of an implant component without resecting a three-dimensional surface of a defect in the bone;   attaching a first implant-engaging surface of a patient-specific augment to a portion of the bone-engaging surface of the implant;   nestingly mating a second patient-specific three-dimensional surface of the augment to the three-dimensional surface of the defect; and   attaching the implant to the bone.   
     
     
         23 . The method of  claim 22 , further comprising mating a third patient-specific peripheral surface of the augment to at least a portion of a complementary surface of the bone. 
     
     
         24 . The method of  claim 22 , further comprising:
 reconstructing a three-dimensional image of the bone with the defect from a medical scan of the bone during a preoperative plan for the patient;   selecting the implant component for the specific patient; and   manufacturing the patient-specific augment from the three-dimensional image of the bone of the specific patient and the implant component.