PATIENT-SPECIFIC AUGMENTS
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 . An implantable device comprising:
an implant component for a bone of a knee joint of a patient, the knee implant component having an outer surface facing the knee joint and a second non-custom surface opposite to the outer surface; and
an augment having first and second surfaces, wherein the first surface is non-custom surface mating with the non-custom surface of the knee implant and the second 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.
13 . The implantable device of claim 12 , wherein the augment has a patient-specific and variable depth measured between the first and second surfaces of the augment.
14 . The implantable device of claim 13 , wherein the augment includes a peripheral surface between the first and second surfaces, and the peripheral surface is a three-dimensional patient specific surface that closely matches and can mate to a complementary surface of the bone of the specific patient.
15 . The implantable device of claim 14 , wherein the peripheral surface has patient-specific variable radial dimension at each depth along the augment.
16 . The implantable device of claim 13 , wherein the first surface of the augment is planar.
17 . The implantable device of claim 12 , wherein the first surface of the augment is piece-wise planar.
18 . The implantable device of claim 12 , wherein the implant component is a distal femoral component and the augment is a femoral augment.
19 . The implantable device of claim 18 , wherein the femoral augment is a femoral sleeve with a fixation bore receiving a boss of the distal femoral component in a taper fit connection.
20 . The implantable device of claim 12 , wherein the implant is a tibial tray and the augment is a tibial augment.
21 . The implantable device of claim 12 , wherein the augment is a tibial sleeve for a proximal tibial bone.
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.