Patient-Specific Implants
An endoprosthetic device includes a monolithic meniscal implant having a three-dimensional patient-specific tibial engagement surface nesting in and complementary to a proximal surface of the proximal tibia of a patient and a femoral articulating surface opposite to the tibial engagement surface for articulating with a femoral condyle of the patient. The meniscal implant includes a first portion and a second remainder portion, wherein the first portion is compressible relative to the second remainder portion.
1 . An endoprosthetic device comprising:
a monolithic meniscal implant having a three dimensional patient-specific tibial engagement surface nesting in and complementary to a proximal surface of the proximal tibia of a patient, a femoral articulating surface opposite to the tibial engagement surface for articulating with a femoral condyle of the patient, the meniscal implant including a first portion and a second remainder portion, wherein the first portion is compressible relative to the second remainder portion.
2 . The endoprosthetic device of claim 1 , wherein the first portion includes a plurality of cutouts providing resiliency to the first portion.
3 . The endoprosthetic device of claim 2 , wherein the meniscal implant comprises cobalt chrome.
4 . The endoprosthetic device of claim 2 , wherein the cutouts are made by electrical discharge machining.
5 . The endoprosthetic device of claim 4 , wherein the cutouts are slits that impart about thirty percent compressibility to the meniscal implant in a superior-inferior direction.
6 . The endoprosthetic device of claim 1 , wherein the plurality of cutouts includes slits extending in an anterior-posterior direction.
7 . The endoprosthetic device of claim 6 , wherein the plurality of cutouts includes slits parallel to and under to the femoral articulating surface.
8 . The endoprosthetic device of claim 6 , wherein the plurality of slits extend to about one quarter of the meniscal implant in a superior to inferior direction.
9 . The endoprosthetic device of claim 1 , further comprising a tibial bearing having a patient specific profile.
10 . The endoprosthetic device of claim 9 , wherein the tibial bearing has a patient-specific articulating surface.
11 . The endoprosthetic device of claim 9 , further comprising a tibial tray having a patient-specific profile.
12 . The endoprosthetic device of claim 11 , wherein the tibial tray has a patient-specific bone engaging surface.
13 . The endoprosthetic device of claim 12 , further comprising a tibial stem coupled to the tibial tray, the tibial stem having a patient-specific orientation relative to the tibial tray.
14 . The endoprosthetic device of claim 11 , wherein the tibial tray is machined from a tray blank capable of accommodating different-size tibial trays, the tibial blank having a plurality of locking tabs engageable with corresponding grooves of the tibial bearing.
15 . An endoprosthetic device comprising:
a meniscal implant including a first portion and a second remainder portion, the first portion including a femoral articulating surface for articulating with a femoral condyle of the patient, the first portion being compressible relative to the second remainder portion, the second remainder portion including a patient specific tibial engagement surface, the tibial engagement surface complementary and engageable to a tibial proximal surface of the patient.
16 . The endoprosthetic device of claim 13 , wherein the first portion includes a plurality of cutouts providing resiliency and compressibility to the first portion.
17 . The endoprosthetic device of claim 16 , wherein the cut-outs are slits providing about thirty percent compressibility relative to the entire height of the meniscal implant,
18 . An endoprosthetic device comprising:
a tibial bearing having a patient specific profile;
a tibial component including a tibial tray having a patient-specific profile; and
a tibial stem having a patient-specific orientation relative to the tibial tray.
19 . The endoprosthetic device of claim 18 , wherein the tibial tray is machined from a tray blank capable of accommodating different-size tibial trays, the tibial blank having a plurality of locking tabs engageable with corresponding grooves of a tibial bearing.
20 . The endoprosthetic device of claim 18 , wherein the locking tabs are not patient-specific.
21 . The endoprosthetic device of claim 18 , wherein the tibial bearing has a patient-specific articulating surface.
22 . A manufacturing method comprising:
machining a tibial tray having a patient-specific profile from a tibial tray blank having a greater size that the tibial tray; and
machining a customized tibial stem from a stem blank coupled to the tibial tray blank.
23 . The method of claim 22 , further comprising machining the tibial stem to have a patient-specific orientation relative to the tibial tray.
24 . The method of claim 22 , further comprising machining the tibial stem to have a patient-specific length.
25 . The method of claim 22 , further comprising machining the tibial stem to have a patient-specific shape.
26 . The manufacturing method of claim 22 , wherein machining a tibial tray having a patient-specific profile form a tibial tray blank includes incorporating a plurality of locking tabs from tibial tray blank to the tibial tray.
27 . The manufacturing method of claim 26 , further comprising customizing the locking tabs.