US20100222891A1 - Modular implant system with fully porous coated sleeve - Google Patents
Modular implant system with fully porous coated sleeve Download PDFInfo
- Publication number
- US20100222891A1 US20100222891A1 US12/781,217 US78121710A US2010222891A1 US 20100222891 A1 US20100222891 A1 US 20100222891A1 US 78121710 A US78121710 A US 78121710A US 2010222891 A1 US2010222891 A1 US 2010222891A1
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- US
- United States
- Prior art keywords
- component
- distal
- tapered
- metaphyseal
- adapter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2002/30925—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth etched
-
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/3094—Designing or manufacturing processes
- A61F2002/30968—Sintering
-
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2/4637—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for connecting or disconnecting two parts of a prosthesis
- A61F2002/4641—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for connecting or disconnecting two parts of a prosthesis for disconnecting
-
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- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
-
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- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
-
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- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2220/0041—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels or rivets, e.g. connecting screws
-
- A—HUMAN NECESSITIES
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0063—Three-dimensional shapes
- A61F2230/0067—Three-dimensional shapes conical
-
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0063—Three-dimensional shapes
- A61F2230/0069—Three-dimensional shapes cylindrical
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
- A61F2250/006—Additional features; Implant or prostheses properties not otherwise provided for modular
- A61F2250/0062—Kits of prosthetic parts to be assembled in various combinations for forming different prostheses
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00029—Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
Landscapes
- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Physical Education & Sports Medicine (AREA)
- Prostheses (AREA)
- Surgical Instruments (AREA)
Abstract
A modular knee implant system allows a surgeon to select between several different styles of distal femoral implant components and several different styles of stem extensions while also allowing for use of a metaphyseal component. The metaphyseal component can be a universal one that is usable with all of the styles of distal femoral implant components through use of an adapter. A second adapter allows for use of stem extensions with different types of connectors with the metaphyseal component. A separate metaphyseal component could also be provided with a distal Morse taper post to mate with a distal femoral component having a proximal Morse taper bore. The metaphyseal component may have an outer surface that is configured to maximize contact area with the patient's bone, and may have a surface finish over a substantial part of its overall length that is conducive to bone ingrowth.
Description
- This is a divisional application of U.S. patent Ser. No. 10/817,051 entitled “MODULAR IMPLANT SYSTEM WITH FULLY POROUS COATED SLEEVE”, which is incorporated by reference herein in its entirety.
- The present invention relates generally to prosthetic joints and, more particularly, to modular orthopaedic knee implant systems.
- The knee joint basically consists of the bone interface of the distal end of the femur and the proximal end of the tibia. Appearing to cover or at least partially protect this interface is the patella which is a sesamoid bone within the tendon of the long muscle (quadriceps) on the front of the thigh. This tendon inserts into the tibial tuberosity and the posterior surface of the patella is smooth and glides over the femur.
- The femur is configured with two knob like processes (the medial condyle and the lateral condyle) which are substantially smooth and which articulate with the medial plateau and the lateral plateau of the tibia, respectively. The plateaus of the tibia are substantially smooth and slightly cupped thereby providing a slight receptacle for receipt of the femoral condyles.
- When the knee joint is damaged whether as a result of an accident or illness, a prosthetic replacement of the damaged joint may be necessary to relieve pain and to restore normal use to the joint. Typically the entire knee joint is replaced by means of a surgical procedure which involves removal of the surfaces of the corresponding damaged bones and replacement of these surfaces with prosthetic implants. This replacement of a native joint with a prosthetic joint is referred to as a primary total-knee arthroplasty.
- On occasion, the primary knee prostheses fails. Failure can result from many causes, including wear, aseptic loosening, osteolysis, ligamentous instability, arthrofibrosis and patellofemoral complications. When the failure is debilitating, revision knee surgery may be necessary. In a revision, the primary knee prosthesis is removed and replaced with components of a revision prosthetic knee system.
- Knee implant systems for both primary and revision applications are available from a variety of manufacturers, including DePuy Orthopaedics, Inc. of Warsaw, Ind. DePuy and others offer several different systems for both primary and revision applications. For example, DePuy Orthopaedics offers the P.F.C. SIGMA® Knee System, the LCS® Total Knee System, and the S-ROM Modular Total Knee System. Each of these orthopaedic knee systems includes several components, some appropriate for use in primary knee arthroplasty and some appropriate for use in revision surgery.
- DePuy Orthopaedics also offers other orthopaedic implant systems for other applications. One such system is the LPS System. The LPS System is provided for use in cases of severe trauma and disease. In such cases, the trauma or disease can lead to significant amounts of bone loss. The LPS System provides components that can replace all or significant portions of a particular bone, such as the femur. The DePuy LPS System is described more fully in U.S. patent application Ser. No. 10/135,791, entitled “Modular Limb Preservation System”, filed Apr. 30, 2002 by Hazebrouck et al., which is incorporated by reference herein in its entirety.
- Although each of the implant systems available from DePuy Orthopaedics provides the surgeon with many options in both primary and revision surgery, many of the components of each individual system are generally not interchangeable with the components of the other systems. This lack of interchangeability of system components is also present in implant systems available from other suppliers of orthopaedic implant systems.
- The present invention addresses the need to provide the orthopaedic surgeon with greater flexibility in the selection of implant components to suit the needs of an individual patient.
- In one aspect, the present invention addresses the need for greater flexibility by providing a modular orthopaedic implant system comprising a first component and a tapered metaphyseal component. The first component has an articulating surface and an interior surface defining a tapered bore. The first component also has an exterior surface spaced from the articulating surface. At least a portion of the exterior surface surrounds the tapered bore. The portion of the exterior surface surrounding the tapered bore is asymmetrical in at least one cross-section. The tapered metaphyseal component is mountable to the distal femoral component.
- In another aspect, the present invention provides an orthopaedic implant system comprising a first orthopaedic component and a metaphyseal component. The metaphyseal component is mountable to the first orthopaedic component. The metaphyseal component has a wide end, a narrow end, an overall length between the wide end and narrow end, and a tapered outer surface. The tapered outer surface of the metaphyseal component includes a plurality of steps and is porous over a majority of the overall length of the metaphyseal component.
- In another aspect, the present invention provides an orthopaedic knee implant system comprising a distal femoral component and a metaphyseal component. The distal femoral component has an articulating surface and a non-articulating surface. The metaphyseal component is mountable to the non-articulating surface of the distal femoral component. The metaphyseal component has a wide end, a narrow end, an overall length between the wide end and narrow end, and a tapered outer surface. The tapered outer surface of the metaphyseal component includes at least five steps per inch of the overall length of the metaphyseal component.
- In another aspect, the present invention provides an orthopaedic knee implant system comprising a distal femoral component and a metaphyseal component mountable to the first orthopaedic component. The distal femoral component has an articulating surface and a non-articulating surface. The metaphyseal component has a wide end, a narrow end, an overall length between the wide end and narrow end, and a tapered outer surface. The tapered outer surface of the metaphyseal component includes a plurality of adjacent steps extending from the wide end to the narrow end, each step being spaced from the adjacent step by a distance of less than 0.2 inches.
- In another aspect, the present invention provides an orthopaedic implant system comprising a first implantable component and a second implantable component. The first implantable component has an articulating surface to replace a portion of a patient's bone. The first implantable component also has a tapered bore. The second implantable component has a tapered bore differing from the tapered bore of the first implantable component in at least one characteristic. The system further includes an adapter for connecting the first implantable component to the second implantable component. The adapter includes two tapered posts. One of the tapered posts is sized and shaped to be received in and frictionally lock with the tapered bore of the first implantable component. The other tapered post is sized and shaped to be received in and frictionally lock with the tapered bore of the second implantable component.
- In another aspect, the present invention provides a modular orthopaedic knee implant system comprising a distal femoral component, a tapered metaphyseal component and two stem extensions. The distal femoral component has a distal articulating surface. The tapered metaphyseal component has a distal end and a proximal end with an opening at the proximal end. The tapered metaphyseal component is mountable to the distal femoral component. The first femoral stem extension has a distal end and a proximal end; the distal end is shaped and sized to be received in and mate with the opening at the proximal end of the tapered metaphyseal component. The second femoral stem extension also has a distal end and a proximal end; the distal end of the second femoral stem extension is different from the distal end of the first femoral shape in size or shape. The system further includes an adapter for connecting the second femoral stem extension to the tapered metaphyseal component. The adapter has a proximal end and a distal end. The adapter distal end is sized and shaped to be received in and mate with the opening at the proximal end of the tapered metaphyseal component. The adapter proximal end has an opening sized and shaped to receive and mate with the distal end of the second femoral stem extension.
- In another aspect, the present invention provides an orthopaedic knee implant kit comprising a first distal femoral component, a second distal femoral component and a tapered metaphyseal component. The first distal femoral component has a distal articulating surface and a post. The second distal femoral component has a distal articulating surface and a proximal end with a bore at the proximal end. The tapered metaphyseal component has a proximal end and a distal end and has an interior surface defining a bore at the distal end. The bore of the tapered metaphyseal component is shaped and sized to receive a portion of the post of the first distal femoral component for mounting the tapered metaphyseal component on the first distal femoral component. The system also includes an adapter. The adapter has a distal end comprising a post shaped and sized to be received in the bore at the proximal end of the second femoral component. The adapter has a proximal end comprising a post shaped and sized to be received in the bore at the distal end of the tapered metaphyseal component. The tapered metaphyseal component may be selectively used with the first distal femoral component and the second distal femoral component.
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FIG. 1 is a perspective view of a femoral implant assembly illustrating a first style of distal femoral component assembled with a first style of femoral stem extension, a new universal modular metaphyseal sleeve component and a first adapter; -
FIG. 2 is an exploded perspective view of the femoral implant assembly ofFIG. 1 ; -
FIG. 3 is a perspective view of a femoral implant assembly illustrating the first style of distal femoral component assembled with a second style of femoral stem extension, the new universal modular metaphyseal sleeve component, a first adapter and a second adapter; -
FIG. 4 is an exploded perspective view of the femoral implant assembly ofFIG. 3 ; -
FIG. 5 is a perspective view of a femoral implant assembly illustrating a second style of distal femoral component assembled with the first style of femoral stem extension and the new universal modular metaphyseal sleeve component; -
FIG. 6 is an exploded perspective view of the femoral implant assembly ofFIG. 5 ; -
FIG. 7 is a perspective view of a femoral implant assembly illustrating the second style of distal femoral component assembled with a second style of femoral stem extension, the new universal modular metaphyseal sleeve component and the second adapter; -
FIG. 8 is an exploded perspective view of the femoral implant assembly ofFIG. 7 ; -
FIG. 9 is a perspective view of a femoral implant assembly illustrating a third style of distal femoral component assembled with the first style of femoral stem extension, the new universal modular metaphyseal sleeve component and a Morse taper post; -
FIG. 10 is an exploded perspective view of the femoral implant assembly ofFIG. 9 ; -
FIG. 11 is a perspective view of a femoral implant assembly illustrating the third style of distal femoral component assembled with the second style of femoral stem extension, the new universal modular metaphyseal sleeve component, the Morse taper post and the second adapter; -
FIG. 12 is an exploded perspective view of the femoral implant assembly ofFIG. 11 ; -
FIG. 13 is a perspective view of a femoral implant assembly illustrating a fourth style of distal femoral component assembled with the first style of femoral stem extension and the new universal modular metaphyseal sleeve component; -
FIG. 14 is an exploded perspective view of the femoral implant assembly ofFIG. 13 ; -
FIG. 15 is a perspective view of a femoral implant assembly illustrating the fourth style of distal femoral component assembled with the second style of femoral stem extension, the new universal modular metaphyseal sleeve component and the second adapter; -
FIG. 16 is an exploded perspective view of the femoral implant assembly ofFIG. 15 ; -
FIG. 17 is a side elevation of the first adapter ofFIGS. 1-4 ; -
FIG. 18 is a cross-section of the first adapter, taken along line 18-18 ofFIG. 17 ; -
FIG. 19 is an end view of the adapter ofFIGS. 17-18 ; -
FIG. 20 is a side elevation of the second adapter ofFIGS. 3-4 , 7-8, 11-12 and 15-16; -
FIG. 21 is a cross-section of the second adapter, taken along line 21-21 ofFIG. 20 ; -
FIG. 22 is a proximal end view of the second adapter ofFIGS. 20-21 ; -
FIG. 23 is a perspective view of the new universal modular metaphyseal sleeve component ofFIGS. 1-16 ; -
FIG. 24 is a distal end view of the new universal modular metaphyseal sleeve component ofFIGS. 1-16 and 22; -
FIG. 25 is a side elevation of the new universal modular metaphyseal sleeve component ofFIGS. 1-16 and 23-24; -
FIG. 26 is a front elevation of the new universal modular metaphyseal sleeve component ofFIGS. 1-16 and 23-25; -
FIG. 27 is a cross-section of the new universal modular metaphyseal sleeve component ofFIGS. 1-16 and 23-26, taken along line 27-27 ofFIG. 25 ; -
FIG. 28 is a cross-section of the new universal modular metaphyseal sleeve component ofFIGS. 1-16 and 23-27, taken along line 28-28 ofFIG. 26 ; -
FIG. 29 is a front elevation of another size of the new universal modular metaphyseal sleeve component ofFIGS. 1-16 and 23-28; -
FIG. 30 is a front elevation of another size of the new universal modular metaphyseal sleeve component ofFIGS. 1-16 and 23-28; -
FIG. 31 is a front elevation of another size of the new universal modular metaphyseal sleeve component ofFIGS. 1-16 and 23-28; -
FIG. 32 is a side view of an alternative embodiment of a new metaphyseal component that can be used with the first style of distal femoral component ofFIGS. 1-4 and 25; -
FIG. 33 is a cross-section of the new metaphyseal component ofFIG. 33 , taken along line 33-33 ofFIG. 32 ; -
FIG. 34 is a front elevation of an existing metaphyseal sleeve component that can be used in the assemblies ofFIGS. 1-16 ; -
FIG. 35 is a cross-section of the existing metaphyseal sleeve component ofFIG. 34 , taken along line 35-35 ofFIG. 34 ; -
FIG. 36 is a cross-section of the first style of distal femoral component ofFIGS. 1-4 ; -
FIG. 37 is a side view of an embodiment of the first style of femoral stem extension ofFIGS. 1-2 , 5-6, 9-10 and 13-14, with part of the distal end shown in cross-section; -
FIG. 38 is a side view of an alternative embodiment of the first style of femoral stem extension, with part of the distal end shown in cross-section; -
FIG. 39 is a front view of an alternative embodiment of the first style of femoral stem extension, similar to the stem extension shown inFIG. 37 but of shorter length; -
FIG. 40 is a side view of an embodiment of the second style of femoral stem extension; -
FIG. 41 is a side view of a stem component that can be used with the first style of distal femoral component ofFIGS. 1-4 and 36; and -
FIG. 42 is a perspective view of another component that can be used with the first style of distal femoral component ofFIGS. 1-4 and 36. - A modular orthopaedic knee implant system incorporating the principles of the present invention is illustrated in the accompanying drawings. The illustrated modular orthopaedic knee implant system includes components of several existing orthopaedic knee implant systems, along with new components that provide the orthopaedic surgeon with greater flexibility in selecting the appropriate components to suit the needs of an individual patient. These patient needs can include factors such as individual anatomy and the condition of the native bone tissue.
-
FIGS. 1-16 illustrate various combinations of knee implant components that can be achieved utilizing the principles of the present invention. The combinations illustrated inFIGS. 1-16 include four different styles of distalfemoral components metaphyseal sleeve component 12A and two different styles offemoral stem extensions adapters femoral components stem extensions adapters new metaphyseal component 12B, shown inFIGS. 32-33 as well as with an existingmetaphyseal component 12C, shown inFIGS. 34-35 . - All of the illustrated distal
femoral components femoral component 10A is sized and shaped to replace the entire distal femur of a patient, as described more fully in U.S. patent application Ser. No. 10/135,791, entitled “Modular Limb Preservation System”. The second illustrated distalfemoral component 10B is a revision femoral component that is part of the DePuy LCS® Knee System. The third illustrated distalfemoral component 10C is part of the DePuy P.F.C. SIGMA® Knee System. And the fourth illustrated distalfemoral component 10D is part of the DePuy S-ROM Knee System. All of the illustrated distalfemoral components surface - It should be understood that although the principles of the present invention are described and illustrated with reference to implant components available from DePuy Orthopaedics, Inc., the invention is not limited to these components. The principles of the present invention can be applied to other implant components, including those of other manufacturers and those subsequently developed.
- Some of the illustrated distal femoral components include parts that allow for use of a metaphyseal sleeve with the distal femoral component. For example, the illustrated distal
femoral component 10B (LCS System) ofFIGS. 5-8 has aMorse taper post 19. The illustratedMorse taper post 19 is sized and shaped to be received in and frictionally engage a Morse taper bore in a metaphyseal sleeve such as the existingmetaphyseal sleeve 12C illustrated inFIGS. 34-35 . The distalfemoral component 10D ofFIGS. 13-16 (S-ROM System) also has a Morse taper post 23 to be received in a distal Morse taper bore 21 of a metaphyseal sleeve such as the existingmetaphyseal sleeve 12C ofFIGS. 34-35 . However, these twocomponents femoral component 10D of the S-ROM System is designed to be connected to the tibial component (not shown) by means of a hinged connection while the distalfemoral component 10B of the LCS System is not connected to the corresponding tibial component (not shown). The distalfemoral component 10C ofFIGS. 9-12 of the P.F.C. SIGMA System is also not connected to the corresponding tibial component (not shown). U.S. Pat. No. 6,171,342, U.S. Pat. No. 5,824,097 and U.S. Pat. No. 5,782,921, incorporated by reference herein in their entireties, disclose a Morse taper post such as that shown at 25 inFIGS. 10 and 12 that can be connected to a distal femoral component like that shown at 10C inFIGS. 9-12 with a threaded bolt such as that shown at 27 inFIGS. 10 and 12 so that the assembly can be used with an existingmetaphyseal sleeve 12C. - Referring to the first illustrated distal
femoral component 10A, the distalfemoral component 10A ofFIGS. 1-4 of the LPS System is shaped to replace the entirety of the native femoral condyles. This distalfemoral component 10A replaces more than 3-5 cm of the native distal femur. The first distalfemoral component 10A has an interior surface 24 (seeFIG. 36 ) defining a Morse taper bore 26 at its proximal end. As shown inFIG. 36 , the portion of the exterior surface of thecomponent 10A surrounding thebore 26 is not cylindrical, but diverges in the proximal direction; in addition, this portion of the exterior surface is asymmetrical in this cross-section. The Morse taper bore 26 is frustro-conical and widest at the proximal end, narrowing over its length. For example, the Morse taper bore 26 may have a diameter of 0.75 inches at its proximal end and a diameter of 0.715 inches nearer the distal end of the Morse taper bore 26, for example. The depth of the Morse taper bore 26 may be 1.39 inches for example. It should be understood that these and all dimensions provided in this description are provided for illustrative purposes only; the invention is not limited to these dimensions or any other dimension unless expressly called for in one of the claims. - The Morse taper bore 26 of the distal
femoral component 10A of the LPS System is shaped to mate with a Morse taper post portion of other components provided as part of the LPS System. Other components of the LPS System that mate with the distalfemoral component 10A are illustrated and described in U.S. patent application Ser. No. 10/135,791, entitled “Modular Limb Preservation System”. Examples of such other components are illustrated inFIGS. 41 and 42 :FIG. 41 illustrates afemoral stem extension 28 with a Morse taper post 30 that is sized and shaped to be received and lock in the Morse taper bore 26 of the distalfemoral component 10A of the LPS System;FIG. 42 illustrates asegmental component 32 with two Morse taper posts 34, 36 that are sized and shaped to be received and lock in the Morse taper bore 26 of the distalfemoral component 10A of the LPS System. The post-bore connections of the LPS System components are designed for a Morse taper fit so that the components are held together by friction when assembled. - In some patients, it may be desirable to use the LPS System as part of an end stage revision, where the native femoral condyles must be completely resected but where a portion of the metaphyseal flare of the native femur above the condyles can be spared. In such a situation, it would be desirable to use the standard
distal femoral component 10A of the LPS System with a tapered metaphyseal component. - To meet this need for a metaphyseal component in combination with a distal
femoral component 10A like that of the LPS System, a new metaphyseal component could be used, as illustrated inFIGS. 1-16 and 23-31 and described in more detail below. Anothernew metaphyseal component 12B that can be used with the distalfemoral component 10A of the LPS System is illustrated inFIGS. 32-33 . Alternatively, an existingmetaphyseal component 12C of other implant systems, illustrated inFIGS. 34-35 , could also be used with the first style of distalfemoral component 10A. The existingmetaphyseal component 12C ofFIGS. 34-35 is part of DePuy Orthopaedics' S-ROM knee system. - All of the illustrated
metaphyseal components FIGS. 23-25 , eachmetaphyseal component outer surface proximal end distal end metaphyseal component metaphyseal component 12A, illustrated inFIGS. 1-16 and 23-31, four different sizes are shown: onesize metaphyseal component 12A is illustrated inFIGS. 1-16 and 23-28; a second, longer (and wider in the medial-lateral direction)size metaphyseal component 12A′ is illustrated inFIG. 29 ; a third, longersize metaphyseal component 12A″ is illustrated inFIG. 30 ; and a fourth, longersize metaphyseal component 12A′″ is illustrated inFIG. 31 . It should be understood that a surgical kit could include fewer or more sizes of metaphyseal components. It should also be understood that although only a single size of metaphyseal component is shown for thecomponents FIGS. 32-35 , a surgical kit utilizing these styles of components would typically have a plurality of sizes of these components available for the surgeon. - All three illustrated styles of
metaphyseal components interior channels metaphyseal sleeve component 12A and the existingmetaphyseal sleeve component 12C, theinterior channel bore 21C of the existingmetaphyseal component 12C and bore 21A of the firstnew metaphyseal component 12A are both sized and shaped to be capable of fitting over and frictionally locking with the Morse taper post 23 of the distalfemoral component 10D of the S-ROM System (seeFIG. 14 ). Both the first and third styles ofmetaphyseal components post 19 of the LCS Systemfemoral component 10B and post 25 of the P.F.C. SIGMA System. As discussed below, in combination with theadapter 16, the first and third styles ofmetaphyseal components femoral component 10A of the LPS System. - The distal
femoral component 10A of the LPS System can also be used with the second illustrated style ofmetaphyseal component 12B. In the secondnew metaphyseal component 12B, there is no distal Morse taper bore. Instead, the secondstyle metaphyseal component 12B has a distal Morse taper post 37 (seeFIGS. 32-33 ) sized and shaped like the Morse taper posts of other components of the LPS System, such asposts components FIGS. 41-42 , so that the distal Morse taper post 37 of the secondstyle metaphyseal component 12B is capable of fitting into and frictionally locking with the Morse taper bore 26 (seeFIG. 36 ) of the distalfemoral component 10A of the LPS System. - The proximal ends of the
interior channels metaphyseal components FIGS. 1-2 , 5-6, 9-10, 13-14 and 37-39. Theinterior channel metaphyseal component annular seat FIGS. 27-28 , 33 and 35) for a screw or bolt shown at 50 inFIGS. 2 , 6 and 10. - Although all three illustrated styles of
metaphyseal components outer surfaces outer surfaces metaphyseal components outer surface 38C of the existingmetaphyseal component 12C. First, as can be seen from a comparison ofFIGS. 23 , 25, 26 and 29-33, the newmetaphyseal components metaphyseal component 12C. The smallest newmetaphyseal component 12A ofFIGS. 23-28 has a total of 19 tapering steps, from adistal step 41A to aproximal step 43A. The next larger size of the firstmetaphyseal component 12A′ has a total of 21 steps from thedistal step 41A′ to theproximal step 43A′ (seeFIG. 29 ). The next larger size of the firstmetaphyseal component 12A″ has a total of 23 steps from thedistal step 41A″ to theproximal step 43A″ (seeFIG. 30 ). And the largest size of the firstmetaphyseal component 12A′″ has a total of 26 steps from thedistal step 41A′″ to theproximal step 43A′″ (seeFIG. 31 ). Illustrative intermediate steps are shown at 45A, 45A′, 45A″ 45A′″ and 45B inFIGS. 25-26 and 29-33. The different sizes of the secondnew metaphyseal component 12B would have similar numbers of steps. Similar step configurations can be used for the secondnew metaphyseal component 12B ofFIGS. 32-33 . It should be understood that the number of steps for the different sizes of newmetaphyseal components - In the first and second illustrated styles of
metaphyseal components largest step distal end 42A, 42B to thesmallest step proximal end FIG. 24 , the dimension shown at 49A increases by 0.008 inch between the mostproximal step 43A and the adjacent step. The distance shown at 49A gradually increases with each step, and the change in thedistance 49A also gradually increases with each step toward thedistal step 41A. In themetaphyseal component 12A with 19 steps (FIGS. 23-28 ), thedistance 49A increases by 0.30 inch between the step adjacent thedistal step 41A and thedistal step 41A. In themetaphyseal component 12A′ with 21 steps, thedistance 49A increases by 0.035 inch between the step adjacent thedistal step 41A′ and thedistal step 41A′. In themetaphyseal component 12A″ with 23 steps, thedistance 49A increases by 0.039 inch between the step adjacent the distal step and thedistal step 41A″. In themetaphyseal component 12A′ with 26 steps, thedistance 49A increases by 0.039 inch between the step adjacent thedistal step 41A′ and thedistal step 41A′″. The distance between steps, shown at 51A, 51A′, 51A″, 51A′″ and 51B in FIGS. 26 and 29-31, is generally about 0.120-0.160 inch in the illustrated embodiment. With overall lengths of 2.390, 2.660, 2.960 and 3.340 inches, the first illustrated style of newmetaphyseal components metaphyseal component - In contrast to the new
metaphyseal components outer surface 38C of the existingmetaphyseal component 12C have a different configuration and fewer steps, both overall and per inch of overall length of themetaphyseal component 12C. In the existingmetaphyseal component 12C, the dimension corresponding with the dimension shown at 49A increases by 0.19-0.28 inch between the mostdistal step 41C and the adjacent step. The distance shown at 49C gradually increases by about 0.59-0.60 inch with each step. The distance between steps, shown at 51C inFIG. 34 , ranges from about 0.19 inches to 0.83 inches, and the ratio of number of steps to overall length ranges from about 2.45 to 3.15 steps/inch. - The above-described differences in the configurations of the steps of the outer surfaces of the new
metaphyseal components metaphyseal component 12C result in differences in the degree of contact between theouter surfaces metaphyseal components metaphyseal components metaphyseal components outer surfaces metaphyseal components metaphyseal component outer surfaces metaphyseal components outer surfaces metaphyseal components - In addition to the above-described differences in configuration of the stepped outer surfaces, the new
metaphyseal components metaphyseal component 12C in the finish of the steppedouter surfaces new metaphyseal component 12A, the steppedouter surface 38A of thecomponent 12A is porous for most of its length and smooth for a short portion at its proximal end. In the secondnew metaphyseal component 12B, the steppedouter surface 38B of thecomponent 12B is porous along its entire length. In the existingmetaphyseal component 12C, the steppedouter surface 38C is smooth for a majority of its length and porous near its distal end only. - As used herein, “porous” refers to a surface that is conducive to bone ingrowth for non-cemented fixation, and “smooth” refers to a surface that is not conducive to such bone ingrowth. Suitable porous surfaces can be made by many different methods: casting, embossing, etching, milling, machining, and coating such as by plasma-spraying or by bonding, for example. Bonded materials can comprise sintered metal beads, sintered metal mesh or screen, or sintered metal fibers, for example. Known, commercially available materials and techniques can be used to create the porous exterior surfaces of the
metaphyseal components - In the first illustrated new
metaphyseal component 12A, theouter surface 38A is porous from thedistal end 42A to a level about 3 steps down from the mostproximal step 43A so that about the top 0.554 inches (14 mm) is smooth rather than porous and the remainder of theouter surface 38A is porous. InFIGS. 25-26 , the porous outer coating is illustrated byphantom lines 53A and the smooth portion of the outer surface is indicated at 57A. Generally, in the illustrated sizes of the firstnew metaphyseal 12A component, theouter surface 38A corresponding with at least about 75-80% of the overall height of themetaphyseal component metaphyseal component 12A, no bony ingrowth should occur at the proximal end. Since the proximal end of the metaphyseal component is the end that receives the distal end of the stem extension, it may be desirable to allow the proximal end of the metaphyseal component to flex somewhat so that stress is not unduly concentrated on the distal end of the stem extension. For this purpose, it is expected that a smooth surface from the proximal end to a point about 10-20 mm from the proximal end should suffice. However, it should be understood that the present invention is not limited to these dimensions or ratios unless expressly set forth in the claims. For example, the entire steppedouter surface 38B could be porous, as in the second illustrated newmetaphyseal component 12B. - In contrast to the new
metaphyseal components FIG. 34 , theporous coating 53C (shown in phantom) extends up to the level of about the third step from thedistal end 42C, leaving the remainder of the steppedouter surface 38C smooth. - Generally, of the three illustrated patterns of surface finishes, it is expected that in the months and years following implantation, there would be less bony ingrowth around the existing
metaphyseal component 12C, so that the existingmetaphyseal component 12C could be more easily removed if a later revision is required. Additional bony ingrowth may be more desirable in situations like end stage revision surgery, for example. Moreover, the benefits of increased bony ingrowth may outweigh any potential difficulty in removal. - The new
metaphyseal components FIGS. 23 , 26 and 29-32, there may benotches metaphyseal sleeve FIG. 42 . With thesenotches metaphyseal components metaphyseal components FIG. 24 . Thesedistal grooves 65 allow for version control when the new metaphyseal components are used with the first distalfemoral component 10A. Thegrooves 65 allow themetaphyseal component femoral component 10A; otherwise rotation would be restricted by thetabs 67 of the distalfemoral component 10A. The existingmetaphyseal component 12C could be modified to include these features. - To allow the
new metaphyseal component 12A and the existingmetaphyseal component 12C to be used with the distalfemoral component 10A of the LPS System, the system of the present invention includes anadapter 16. As shown inFIGS. 17-19 , the illustratedadapter 16 has aproximal portion 52, adistal portion 54 and anannular collar 55 between theproximal portion 52 anddistal portion 54. - The distal portion of the
adapter 16 has an outer surface that is sized and shaped to be received within and frictionally lock with the Morse taper bore 26 of the LPS distalfemoral component 10A. In other words, the outer surface of the distal portion defines a distal Morse taper post 54 that is sized and shaped like the Morse taper posts 30, 34, 36 of theother LPS components femoral component 10A of the LPS System. - The
annular collar 55 of theadapter 16 has an enlarged diameter to seat on a portion of the distalfemoral component 10A of the LPS System to limit movement of the adapter in a distal direction. - The proximal portion of the
adapter 16 has an outer surface that is sized and shaped to be received within and frictionally lock within the distal Morse taper bore 21A portion of thenew metaphyseal component 12A and the distal Morse taper bore 21C of the existingmetaphyseal component 12C. In other words, the proximal portion of theadapter 16 defines a proximal Morse taper post 52 that is sized and shaped to mimic the size and shape of the existing Morse taper posts of the S-ROM System, such aspost 23 shown inFIGS. 14 and 16 . This same shape of the existingMorse taper post 23 is also present in thepost 19 of the distalfemoral component 10B of the LCS revision System, illustrated inFIGS. 6 and 8 . This same shape of the existingMorse taper post 23 may also be used for thepost 25 to be assembled with the distalfemoral component 10C of the P.F.C. SIGMA System. - As can be seen from
FIGS. 1-4 and 17-18, the distal Morsetaper post portion 54 of theadapter 16 is larger in diameter and shorter than the proximal Morsetaper post portion 52 of theadapter 16. With these differently shaped and sized Morsetaper post portions adapter 16 can be used to connect components that lack commonly shaped and sized Morse taper bores, such as the distalfemoral component 10A of the LPS System and the existingmetaphyseal component 12C of the S-ROM System. - The illustrated
adapter 16 has aninterior channel 56 extending from its proximal end to its distal end. As shown inFIG. 18 , theend parts interior channel 56 may be threaded to allow for screws or bolts to also be used for impaction or distraction In addition, theinterior channel 56 provides an air passage to release pressure as theadapter 16 is connected to other components. - Thus, the
first adapter 16 allows the first illustrated distalfemoral component 10A to be used with thenew metaphyseal component 12A as well as with the existingmetaphyseal component 12C. Moreover, thesemetaphyseal components adapter 16 with the distalfemoral components FIGS. 5-16 . Thus, with theadapter 16, the firstnew metaphyseal component 12A and the existingmetaphyseal component 12C are universal, usable across four different knee implant systems. - Since all three styles of
metaphyseal components metaphyseal components femoral stem extensions 14A of DePuy Orthopaedics' S-ROM System. Examples of suchfemoral stem extensions 14A are illustrated inFIGS. 26-28 . A surgical kit can include both straight and bowed femoral stem extensions, and stem extensions of various lengths and thicknesses. The femoral stem extensions provided in the kit may have outer surfaces designed for use in cemented or press fit applications; for example, the outer surfaces of the femoral stem extensions can have longitudinal grooves. In addition, the femoral stem extensions could have one or more slots such as shown inFIG. 37 . All of these variations in thestem extension 14A features can be used with all three illustratedmetaphyseal components - To provide the orthopaedic surgeon with even more choices in optimizing the knee implant assembly for the needs of the individual patient, the knee implant system of the present invention may be provided with a
second adapter 18 to allow for use of all threemetaphyseal components femoral stem extensions 14A of DePuy Orthopaedics' S-ROM System. - As shown in
FIGS. 3-4 , 7-8, 11-12, and 15-16, by use of thesecond adapter 18, the firstnew metaphyseal component 12A can be used with stem extensions having a distal end that would not normally provide a connection with the proximal end of themetaphyseal component 12A. For example, thesecond adapter 18 may allow the firstnew metaphyseal component 12A to be used with femoral stem extensions having end connections designed for use with DePuy Orthopaedics' P.F.C. SIGMA Knee implant system. Theadapter 18 may also be used with the secondnew metaphyseal component 12B and the existingmetaphyseal component 12C so that all threemetaphyseal components stem extensions 14B. - As shown in
FIGS. 20-22 , thesecond adapter 18 has an outer surface with a tapered distal portion and a proximal portion. The tapered distal portion defines a Morse taper post 61 that is sized and shaped to be received in and frictionally lock with the proximal Morse taper bore 47A, 47B, 47C of eachmetaphyseal component proximal portion 62 of the outer surface of thesecond adapter 18 is substantially cylindrical in overall shape, with a plurality ofindents 64 to allow theadapter 18 to be grasped by a tool such as a wrench (not shown). - As shown in
FIG. 21 , thesecond adapter 18 also has aninterior channel 66. Thedistal portion 68 of theinterior channel 66 is threaded to receive the threaded portion of the screw or bolt 50 for securing thesecond adapter 18 to themetaphyseal component proximal portion 70 of theinterior channel 66 is also threaded to receive the threadeddistal end 72 of astem extension 14B of the style shown inFIG. 40 . As shown inFIG. 40 , the threaded distal ends 72 of the existing stem extensions of the P.F.C. SIGMA System have reduced outer diameters and threaded outer surfaces. - The second style of
stem extensions 14B may have standard features of the commercially available stem extensions of the P.F.C. SIGMA System. For example, thesestem extensions 14B may be shaped for press fit or cemented application, and could be fully or partially porous coated. Other standard variations in the outer surfaces of the stem extensions can also be made. A typical surgical kit would include several sizes ofsuch stem extensions 14B. - Thus, the present invention allows for use of any of the illustrated
metaphyseal components femoral component 10A of the LPS System, and allows two of the illustratedmetaphyseal components femoral components metaphyseal components femoral component 10B of the LCS System, the distalfemoral component 10C of the P.F.C. SIGMA System, and the distalfemoral component 10D of the S-ROM System. In addition, the present invention allows all three illustratedmetaphyseal components femoral stem extensions 14A of the S-ROM System, but also with the commerciallyavailable stem extensions 14B of the P.F.C. SIGMA System. This increased flexibility is available without changing the existing connection mechanisms or the shapes and sizes in these existing knee systems. - For all of the Morse taper posts 19, 23, 25, 46, 52, 54, 61 and Morse taper bores 21A, 21C, 26, 47A, 47B, 47C described above, the length of the post would be less than or equal to the depth of the mating bore. The Morse taper posts 19, 23, 25, 46, 52, 54, 61 and bores 21A, 21C, 26, 27, 47A, 47B, 47C can be conically or frustoconically shaped. The angle of the frustoconical taper would be expected to be less than about 8°, and typically in the range of about 2-4°. Unless expressly called for in the claims, no particular angle or dimension is required for Morse taper posts 19, 23, 25, 46, 42, 54, 61 and bores 21A, 21C, 26, 27, 47A, 47B, 47C of the implant system of the present invention. Although the illustrated examples utilize Morse taper posts and bores, it should be understood that the present invention can be used with any style of interlocking posts and bores.
- All of the components of the illustrated knee implant systems can be made of standard materials for such implants, such as titanium and cobalt-chrome.
- In use, depending on the condition of the native bone tissue, the orthopaedic surgeon will determine the amount of bone to be resected from the femur and will select the most appropriate style of distal
femoral component femoral stem extension femoral stem extension - If the most appropriate stem extension for the individual patient's needs is one having a distal end like those illustrated in
FIGS. 1-2 , 5-6, 9-10, 13-14, and 26-28, the surgeon can assemble thestem extension 14A andmetaphyseal component stem extension 14A into the proximal Morse taper bore 47 of the metaphyseal component 12 and moving the twocomponents 12, 14A into frictional engagement. The screw or bolt 50 can then be inserted through the metaphyseal component 12 and threaded into engagement with theinternal threads 96 at the distal end of thestem extension 14A in a conventional manner. - If the most appropriate stem extension for the individual patient's needs is one having a distal end like those illustrated in
FIGS. 3-4 , 7-8, 11-12, 15-16 and 40, the surgeon can assemble thestem extension 14B andmetaphyseal component second adapter 18. To assemble thestem extension 14B,adapter 18 andmetaphyseal component second adapter 18 in the proximal Morse taper bore 47A, 47B or 47C of themetaphyseal component interior channel 66 of thesecond adapter 18 as thecomponents 12, 18 are assembled. The screw or bolt 50 can be inserted through the distal bore of the metaphyseal component 12 and threaded onto the threadedinternal bore 68 at the distal end of thesecond adapter 18 to secure these components together. The distal threadedend 72 of thestem extension 14B can then be inserted into the proximal threaded bore 70 of theadapter 18 and threaded onto the internal threads of theadapter 18. The subassembly of themetaphyseal component adapter 18 and thestem extension 14B is then ready for assembly with the distal femoral component. - If the most appropriate style of distal femoral component is that shown in
FIGS. 5-8 and 13-16 as 10B or 10D, the metaphyseal component/stem extension subassembly or metaphyseal component/stem extension/second adapter subassembly can then be mounted on the existing stem or post 19, 23 of the distalfemoral component FIGS. 27-28 and 35) of themetaphyseal component FIGS. 7 and 13 , can then be implanted. - If the most appropriate style of distal femoral component is that shown in
FIGS. 1-4 and 25 as 10A, the surgeon would place the distal Morse taper post 54 of theadapter 16 into the Morse taper bore 26 of the distalfemoral component 10A and move the twocomponents adapter 16 as these components are assembled. The subassembly of the distalfemoral component 10A andadapter 16 can then be assembled with the subassembly of themetaphyseal component stem extension 14A, or subassembly of themetaphyseal component second adapter 18 andstem extension 14B. The two subassemblies can be moved together to frictionally engage the proximal Morse taper post 52 of theadapter 16 and the distal Morse taper bore 21A or 21C (seeFIGS. 27-28 and 35) of themetaphyseal component FIGS. 1 and 3 , can then be implanted. - If the most appropriate style of distal femoral component is that shown in
FIGS. 9-12 as 10C, the surgeon can assemble the femoral stem or post 25 to the distalfemoral component 10C using thebolt 27 shown inFIGS. 10 and 12 , and then insert the stem orbolt 50 into the distal Morse taper bore 21A or 21C (seeFIGS. 27-28 and 35) of themetaphyseal component post 25 and bore 21A or 21C can then be moved together into frictional engagement and the complete assembly as shown inFIGS. 9 and 11 can then be implanted. - If a metaphyseal component as shown in
FIGS. 32-33 is used, the surgeon can first assemble the metaphyseal component 12 b and the selectedstem 14A, ormetaphyseal component 12B,second adapter 18 and selected stem 14B into a subassembly. The subassembly can then be assembled with the distalfemoral component 10A by inserting the distal Morse taper post 37 of themetaphyseal component 12B into the proximal Morse taper bore 26 of the distalfemoral component 10A and then moving the components into frictional engagement. The assembled implant can then be implanted. - It should be understood that although not illustrated, the knee implant system or kit would also include tibial components that are designed to cooperate with the femoral implant assemblies. It should also be understood that some or all of the principles of the present invention could be applied to other implants, such as tibial implants.
- It should also be understood that a typical surgical kit would also include trial implant components like those shown in
FIGS. 1-16 . The surgeon would typically assemble a trial implant and temporarily secure the trial implant assembly in place on the prepared bone to ensure that the assembled implant will be the optimum for the individual patient's needs. The trial components can have features like those described above for the final implant components. - In addition, a surgical kit utilizing the principles of the present invention could include several sizes of one style of metaphyseal component, such as the first
new metaphyseal component 12A, the secondnew metaphyseal component 12B or the existingmetaphyseal component 12C. Alternatively, such a surgical kit could include several sizes of two or more of the illustrated styles ofmetaphyseal components - Various modifications and additions can be made to the above-described embodiment without departing from spirit of the invention. For example, the distal
femoral component 10A could have a Morse taper bore 26 sized and shaped like thedistal bore metaphyseal component adapter 16 could be symmetrical about a central plane, so that the proximal and distal ends of the adapter could be used interchangeably. Moreover, the principles of the present invention could be applied to orthopaedic implants designed to replace joints other than the knees. Various other modifications and additions can be made, and all such modifications and additions are intended to fall within the scope of the claims unless the claims expressly call for a specific construction.
Claims (7)
1. A modular orthopaedic knee implant system comprising:
a distal femoral component;
a tapered metaphyseal component having a distal end and a proximal end with a proximal opening at the proximal end and an interior surface defining a proximal tapered bore extending from the proximal opening toward the distal end of the tapered metaphyseal component, the tapered metaphyseal component being mountable to the distal femoral component, the tapered metaphyseal component having an outer surface including a plurality of steps and being widest at its distal end;
a first femoral stem extension having a distal end and a proximal end, the distal end comprising a tapered post shaped and sized to be received in and frictionally mate with the proximal tapered bore the tapered metaphyseal component;
a second femoral stem extension having a distal end and a proximal end, the distal end of the second femoral stem extension comprising a threaded post; and
a stem adapter for connecting the second femoral stem extension to the tapered metaphyseal component, the stem adapter having a central longitudinal axis, a distal end including a tapered post and a proximal end with a proximal opening at the proximal end and an interior surface defining a threaded bore extending from the proximal opening toward the distal end of the stem adapter, the threaded bore being shaped and sized to engage the threaded post of the second femoral stem extension;
wherein the tapered post of the stem adapter has a longitudinal axis and the threaded bore of the stem adaper has a longitudinal axis co-linear with the longitudinal axis of the tapered post of the stem adapter and the longitudinal axes of the tapered post and threaded bore are co-linear with the central longitudinal axis of the stem adapter.
2. The modular orthopaedic knee implant system of claim 1 wherein the tapered metaphyseal component has a distal opening at the distal end and an interior surface defining a distal bore extending from the distal opening toward the proximal end of the tapered metaphyseal component.
3. The modular orthopaedic knee implant system of claim 2 further comprising a second adapter having a tapered proximal outer surface shaped and sized to be received within and frictionally lock with the distal bore of the tapered metaphyseal component.
4. The modular orthopaedic knee implant system of claim 3 further comprising a bolt for connecting the second adapter to the distal femoral component.
5. The modular orthopaedic knee implant system of claim 2 wherein the distal femoral implant component includes a post shaped and sized to be received within and frictionally lock with the distal bore of the tapered metaphyseal component.
6. The modular orthopaedic knee implant system of claim 2 wherein the distal femoral component has a pair of spaced, curved distal articulating surfaces, a proximal end opposite the articulating surfaces, an interior surface defining a tapered bore at the proximal end, the tapered bore being widest at the proximal end and extending distally from the proximal end, and an exterior surface spaced from the distal articulating surfaces, at least a portion of the exterior surface surrounding the tapered bore, the portion of the exterior surface surrounding the tapered bore being asymmetrical in at least one cross-section, the maximum dimension of the distal femoral component in the proximal-distal direction being the distance from the distal articulating surfaces to the proximal end.
7. The modular orthopaedic knee implant system of claim 6 further comprising a second adapter having a central longitudinal axis and comprising a first tapered post sized and shaped to be receivable within the tapered bore of the distal femoral component and to create a frictional lock between the distal femoral component and the second adapter, the second adapter further comprising a second tapered post sized and shaped to be receivable within the distal tapered bore of the tapered metaphyseal component, wherein the first and second tapered posts of the second adapter are aligned along the central longitudinal axis of the second adapter and are widest at a location between the ends of the second adapter.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US12/781,217 US20100222891A1 (en) | 2003-11-18 | 2010-05-17 | Modular implant system with fully porous coated sleeve |
Applications Claiming Priority (3)
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US52317003P | 2003-11-18 | 2003-11-18 | |
US10/817,051 US7799085B2 (en) | 2003-11-18 | 2004-04-02 | Modular implant system with fully porous coated sleeve |
US12/781,217 US20100222891A1 (en) | 2003-11-18 | 2010-05-17 | Modular implant system with fully porous coated sleeve |
Related Parent Applications (1)
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US10/817,051 Division US7799085B2 (en) | 2003-11-18 | 2004-04-02 | Modular implant system with fully porous coated sleeve |
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Also Published As
Publication number | Publication date |
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US7799085B2 (en) | 2010-09-21 |
ATE537780T1 (en) | 2012-01-15 |
EP1532945A3 (en) | 2005-08-03 |
JP2005144185A (en) | 2005-06-09 |
US20050107883A1 (en) | 2005-05-19 |
AU2004231157B2 (en) | 2011-03-17 |
EP1532945A2 (en) | 2005-05-25 |
EP1532945B1 (en) | 2011-12-21 |
AU2004231157B8 (en) | 2011-04-07 |
AU2004231157A1 (en) | 2005-06-02 |
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