WO2009091802A2 - Système du genou et son procédé de fabrication - Google Patents

Système du genou et son procédé de fabrication Download PDF

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Publication number
WO2009091802A2
WO2009091802A2 PCT/US2009/030956 US2009030956W WO2009091802A2 WO 2009091802 A2 WO2009091802 A2 WO 2009091802A2 US 2009030956 W US2009030956 W US 2009030956W WO 2009091802 A2 WO2009091802 A2 WO 2009091802A2
Authority
WO
WIPO (PCT)
Prior art keywords
articulating
polymeric
tibial
prosthesis
component
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.)
Ceased
Application number
PCT/US2009/030956
Other languages
English (en)
Other versions
WO2009091802A3 (fr
Inventor
Oludele O. Popoola
Joel G. Scrafton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zimmer Inc
Original Assignee
Zimmer Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Zimmer Inc filed Critical Zimmer Inc
Publication of WO2009091802A2 publication Critical patent/WO2009091802A2/fr
Publication of WO2009091802A3 publication Critical patent/WO2009091802A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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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
    • A61F2/38—Joints for elbows or knees
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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
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    • A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
    • A61F2002/30011—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis differing in porosity
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    • A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
    • A61F2002/30014—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis differing in elasticity, stiffness or compressibility
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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
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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
    • 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
    • A61F2310/00179—Ceramics or ceramic-like structures
    • A61F2310/00269—Ceramics or ceramic-like structures based on metal carbides
    • A61F2310/00281—Ceramics or ceramic-like structures based on metal carbides containing silicon carbide
    • 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
    • A61F2310/00179—Ceramics or ceramic-like structures
    • A61F2310/00299—Ceramics or ceramic-like structures based on metal nitrides
    • A61F2310/00317—Ceramics or ceramic-like structures based on metal nitrides containing silicon nitride
    • 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
    • A61F2310/00389—The prosthesis being coated or covered with a particular material
    • A61F2310/00592—Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
    • 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
    • A61F2310/00389—The prosthesis being coated or covered with a particular material
    • A61F2310/00592—Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
    • A61F2310/00856—Coating or prosthesis-covering structure made of compounds based on metal nitrides
    • A61F2310/0088—Coating made of titanium nitride
    • 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
    • A61F2310/00389—The prosthesis being coated or covered with a particular material
    • A61F2310/00592—Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
    • A61F2310/00856—Coating or prosthesis-covering structure made of compounds based on metal nitrides
    • A61F2310/00886—Coating made of chromium nitride
    • 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
    • A61F2310/00389—The prosthesis being coated or covered with a particular material
    • A61F2310/00592—Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
    • A61F2310/00856—Coating or prosthesis-covering structure made of compounds based on metal nitrides
    • A61F2310/00892—Coating made of zirconium nitride
    • 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
    • A61F2310/00389—The prosthesis being coated or covered with a particular material
    • A61F2310/00592—Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
    • A61F2310/00916—Coating or prosthesis-covering structure made of compounds based on metal sulfides
    • A61F2310/00922—Coating made of molybdenum sulfide

Definitions

  • the present invention relates to knee prostheses and, particularly, to femoral and tibial prostheses.
  • Prostheses are commonly utilized to repair and/or replace damaged bone and tissue in the human body.
  • a knee prosthesis may be implanted to replace damaged or destroyed bone in the tibia and/or femur and to recreate the natural, anatomical articulation of the knee joint.
  • the prosthesis may be shaped to replicate one or both of the natural femoral condyles.
  • a femoral prosthesis may be formed entirely of a rigid metal, which can be formed in complicated geometries and withstand the unique load patterns experienced by the femoral component.
  • one side of the femoral component is secured to the bone stock of the femur and the opposing side of the femoral component is configured for articulation against a prosthetic tibial component or the natural tibia.
  • a prosthetic tibial component may include a first, articulating component having a concave condyle portion configured for articulation against the femoral component.
  • the articulating component of the tibial prosthesis may be secured to a tray component that has an opposing side for securing the tibial prosthesis to the bone stock of a resected proximal tibia.
  • the articulating component of the tibial prosthesis may be made from a polymer to facilitate articulation with the femoral component, while the tray component of the tibial prosthesis may be made from a metal to provide additional strength and rigidity to the tibial prosthesis. In this manner, the femoral component and tibial component work together to replicate the natural, anatomical articulation of the knee joint.
  • a femoral prosthesis is formed as a femoral component incorporating a base material and an articulating material.
  • the base material is a metal and the articulating material is a polymer.
  • the base material provides strength and rigidity to the femoral component, while the articulating material contacts a tibial prosthesis or natural tibia during joint articulation.
  • the articulating material forms the articulating surface of one or more condyle portions of the femoral component.
  • the base material provides support and rigidity to the articulating material.
  • the base material surrounds the articulating material to provide additional support and rigidity to the sides of the articulating material.
  • a tibial prosthesis in the form of a tibial component including an articulating surface and an attachment surface.
  • the attachment surface of the tibial component is configured for attachment to the resected proximal end of a tibia and the articulating surface is configured for articulating against the condyle portion of a femoral component and/or of the natural femur.
  • the articulating surface and the attachment surface of the tibial component are formed from a single material.
  • the entire tibial component may be formed from a metal or a ceramic.
  • the tibial component By forming the tibial component from a single material, the strength and rigidity of the tibial component is maintained throughout its entirety. Additionally, any potential backside wear of the tibial component, i.e., wear between an articulating component and a tray component, is eliminated.
  • the tibial component may be formed from a plurality of materials.
  • the articulating surface may be formed from a metal and/or ceramic, while the attachment surface of the tibial component may be formed from a polymer.
  • the attachment surface may be secured directly to the resected proximal tibia.
  • the tibial component may be seated upon a tibial tray component that provides additional rigidity to the tibial component and cooperates with the tibial component to form the tibial prosthesis. Additionally, by providing a polymer layer between the resected proximal tibial or the tray component and the articulating surface, a cushioning effect may be provided within the knee prosthesis, which may provide a better fit and feel to the patient.
  • the wear of a prosthetic knee incorporating the femoral and tibial prostheses of the present invention is substantially reduced.
  • preliminary testing has indicated that the present design results in a reduction in wear of up to 35% over traditional knee prosthesis designs in which the femoral component is metal or ceramic and the articulating surface of the tibial component is a polymer.
  • the present invention provides a knee prosthesis, including: a femoral component formed from a non-polymeric base material and a polymer articulating material, the femoral component having at least one condyle portion formed from the non- polymeric base material, the at least one condyle portion having an upper surface and a wall at least partially defining a groove, the polymer articulating material received within the groove, the wall of the at least one condyle portion surrounding the polymer articulating material, the polymer articulating material defining an articulation surface configured for articulation against one of a tibial prosthesis and a resected proximal tibia, the articulation surface of the polymer articulating material positioned substantially flush with the upper surface of the at least one condyle portion.
  • the present invention provides a tibial prosthesis, including: a tibial component having a polymeric body and at least one non-polymeric articulating portion, the polymeric body having an upper surface, the at least one non- polymeric articulating portion having a perimeter and an articulating surface configured for articulating with one of a femoral prosthesis and a natural femur, the non-polymeric articulating portion received within the polymeric body, wherein the polymeric body surrounds the perimeter of the non-polymeric articulating portion and the articulating surface of the non-polymeric articulating portion is substantially flush with the upper surface of the polymeric body.
  • FIG. 1 is a perspective view of an exemplary embodiment of a femoral component of the present invention
  • FIG. 2 is another perspective view of the femoral component of Fig. 1 ;
  • FIG. 3 is a perspective view of the femoral component of Fig. 1 depicting the femoral component prior to the attachment of articulating material;
  • FIG. 4 is another perspective view of the femoral component of Fig. 3;
  • FIG. 5 is a perspective view of an exemplary embodiment of a tibial component of the present invention.
  • FIG. 6 is a plan view of another exemplary embodiment of a tibial component of the present invention.
  • Fig. 7 is a cross-sectional view of the femoral component of Fig. 1 taken along line 7-7 of Fig. 1 ;
  • FIG. 8 is a cross-sectional view of another exemplary embodiment of a femoral component of the present invention taken at the same position as the cross-sectional view of
  • FIG. 9 is an enlarged view of the portion of the femoral component of Fig. 8 encircled in dashed lines;
  • Fig. 10 is a cross-sectional view of another exemplary embodiment of a tibial component of the present invention taken at the same position as the cross-sectional view of
  • Fig. 11 is a cross-sectional view of the tibial component of Fig. 6, taken along line 11-11 of Fig. 6;
  • Fig. 12 is an exploded, perspective view of a tibial prosthesis including the tibial component of Fig. 6 and a tibial tray component;
  • Fig. 13 is a cross-sectional view of the tibial prosthesis of Fig. 12 taken along line
  • a femoral prosthesis is shown in the form of femoral component 10, which is formed from base material 12 and articulating material 14.
  • Femoral component 10 includes condyle portions 16, 18 that define upper surfaces 19 and are formed from base material 12.
  • condyle portion is defined as a section of material that has a geometry substantially replicating or mimicking the anatomical geometry of a natural femoral condyle. While several features of femoral prosthesis 10 are described and depicted herein with specific reference to condyle portion 18, condyle portion 16 may be formed in a substantially similar manner and include substantially similar or identical features as condyle portion 18.
  • femoral component 10 may be formed as a unicondylar prosthesis having only a single condyle portion.
  • articulating material 14 defines articulating surfaces 20 of condyle portions 16, 18.
  • base material 12 and articulating material 14 are selected from different classes of materials.
  • base material 12 is a non-polymeric material, such as a biocompatible metal or ceramic
  • articulating material 14 is a polymer or hydrogel.
  • the ceramic may be an oxide ceramic, such as alumina or zirconia; a non-oxide ceramic, such as silicon nitride or silicon carbide; or other ceramic materials that are biologically inert, and yet are sufficiently hard and abrasion resistant.
  • the ceramic may be a monolith or, alternatively, the ceramic may be a plurality of discrete microscopic or macroscopic particles held in a matrix.
  • base material 12 is a metal
  • the metal may be titanium, a titanium alloy, cobalt chromium, cobalt chromium molybdenum, stainless steel, porous tantalum, and/or a highly porous biomaterial, for example.
  • a highly porous biomaterial is useful as a bone substitute and/or a cell and tissue receptive material.
  • a highly porous biomaterial may have a porosity as low as 55, 65, or 75 percent and as high as 80, 85, or 90 percent.
  • An example of such a material is produced using Trabecular MetalTM technology generally available from Zimmer, Inc., of Warsaw, Indiana. Trabecular MetalTM is a trademark of Zimmer Technology, Inc.
  • Such a material may be formed from a reticulated vitreous carbon foam substrate which is infiltrated and coated with a biocompatible metal, such as tantalum, etc., by a chemical vapor deposition ("CVD") process in the manner disclosed in detail in U.S. Patent No. 5,282,861, the disclosure of which is expressly incorporated herein by reference.
  • CVD chemical vapor deposition
  • other metals such as niobium, or alloys of tantalum and niobium with one another or with other metals may also be used.
  • the porous tantalum structure includes a large plurality of ligaments defining open spaces therebetween, with each ligament generally including a carbon core covered by a thin film of metal such as tantalum, for example.
  • the open spaces between the ligaments form a matrix of continuous channels having no dead ends, such that growth of cancellous bone through the porous tantalum structure is uninhibited.
  • the porous tantalum may include up to 75%-85% or more void space therein.
  • porous tantalum is a lightweight, strong porous structure which is substantially uniform and consistent in composition, and closely resembles the structure of natural cancellous bone, thereby providing a matrix into which cancellous bone may grow to provide fixation of base material 12 of femoral component 10 to the bone stock of the distal femur.
  • the porous tantalum structure may be made in a variety of densities in order to selectively tailor the structure for particular applications.
  • the porous tantalum may be fabricated to virtually any desired porosity and pore size, and can thus be matched with the surrounding natural bone in order to provide an improved matrix for bone ingrowth and mineralization.
  • articulating material 14 of femoral component 10 is a polymer.
  • articulating material 14 may be polyethylene, a poly ether ether ketone, fiber reinforced poly ether ether ketone, ultrahigh molecular weight polyethylene, crosslinked ultrahigh molecular weight polyethylene, polyether ketone ether ketone, poly ether ketone ketone, polycarbonate urethane, polyphenylene, and/or an antioxidant stabilized ultrahigh molecular weight polyethylene, for example.
  • articulating material 14 is formed from PrimoSpireTM self reinforced polyphenylene, commercially available for SOLVAY Advanced Polymers, LLC, of Alpharetta, Georgia.
  • PrimoSpireTM is a trademark of SOLVAY Advanced Polymers, LLC, of Alpharetta, Georgia.
  • a rigid base material 12 such as a metal
  • a more resilient articulating material 14 such as a polymer
  • wear of femoral component 10 may be reduced.
  • articulating material 14 is a hydrogel.
  • articulating material 14 may be polyvinyl pyrrolidinone, polyethylene ninyl alcohol, polystyrene allyl alcohol, and/or bisphenos.
  • articulating material 14 may be coated with a ceramic layer, which articulates against a tibial component or natural tibia during normal knee articulation.
  • the ceramic layer on articulating material 14 is formed by methods known by those skilled in the art, such as, by plasma spray, flame spray, HVOF spray, cold spray, or other spray coating technique that provides bonding without substantial degradation of articulating material 14.
  • the ceramic coating may also be formed on articulating material 14 by ion implantation, ion beam assisted deposition, CVD, or PVD, as is known in the art.
  • grooves 22, 24 are formed within condyle portions 16,
  • grooves 22, 24 are machined into condyle portions 16, 18.
  • femoral component 10 is cast and/or formed to include grooves 22, 24.
  • grooves 22, 24 may be prepared using a water jet, electrical discharge machining (EDM), and/or grit blasting.
  • articulating material 14 may be received within grooves 22, 24 by the use of an adhesive, welding, thermal spraying, dynamic cold spraying, plasma spraying, insert molding, compression molding, injection molding, laser cladding, and/or press fitting, for example. Additionally, lubricious polymeric materials, such as 2-methacryloyloxyethyl phosphorylchlorine can be grafted into groove 22, 24.
  • groove 24 is at least partially defined by wall 26.
  • Wall 26 extends from bottom 28 of groove 24 to upper surface 19 of condyle portion 18.
  • articulating material 14 fills groove 24 (Fig. 3) and forms articulating surface 20, which is substantially flush with upper surface 19 of condyle portion 18.
  • articulating surface 20 substantially flush with upper surface
  • grooves 22, 24 may have a depth D of greater than or less than 2 mm.
  • grooves 22, 24, may have a depth D as small as 0.5 mm, 1.0 mm, 1.5, mm, or 2.0 mm, and as large as 2.5 mm, 3.0 mm, 3.5 mm, or 4.0 mm.
  • groove 22 of condyle portion 16 may be formed in a substantially similar manner as groove 24.
  • base material 12 of femoral component 10 may be characterized as occupying a volume that is substantially greater than the volume of articulating material 14.
  • base material 12 and, correspondingly, femoral component 10 may not substantially deflect while under load.
  • the rigidity of base material 12 may permit uniform, predictable, and consistent loading of articulating surface 20.
  • articulating surface 20 when loaded, articulating surface 20 receives substantially uniform frictional contact with an opposing articular surface on the natural tibia or tibial prosthesis, and thus, rigidity of base material 12 may limit abrasion along any specific portion of articulating surface 20.
  • articulating material 14 of femoral component 10 may exhibit some elasticity during loading to allow axial deflection or deformation of articulating material 14. Therefore, pressures exerted on femoral component 10 may be partially absorbed during elastic motion of articulating material 14. Further, the additional rigidity provided by base material 12 helps to prevent articulating material 14 from shearing or otherwise separating from base material 12.
  • condyle portion 18 further includes lip 30.
  • Lip 30 extends from wall 26 and cooperates with wall 26 to define groove 24.
  • lip 30 extends inwardly from wall 26 in the direction of groove 24 as lip 30 approaches articulating surface 20 and upper surface 19 of condyle portion 18 and forms an obtuse angle ⁇ with wall 26.
  • angle ⁇ extends between wall 26 and lip 30.
  • angle ⁇ is as small as 95 degrees, 120 degrees, 130 degrees, and 145 degrees and as large as 150 degrees, 160 degrees, and 170 degrees.
  • lip 30 facilitates the retention of articulating material 14 within groove 24, as the interaction of lip 30 with articulating material 14 substantially prevents removal and/or delamination of articulating material 14 from groove 24. Specifically, as articulating material 14 advances in the direction of lip 30, articulating material 14 contacts lip 30. In order for a portion of articulating material 14 to be positioned outside of groove 24, at least a portion of articulating material 14 has to be deformed in order to pass by lip 30.
  • articulating material 14 is not deformed during normal knee articulation to the extent necessary to cause articulating material 14 to deform inwardly and allow articulating material 14 to pass by lip 30. Therefore, removal and/or delamination of articulating material 14 from groove 24 is substantially prevented. In addition, attachment of articulating material 14 is improved by base material 12 fully supporting articulating material 14 within groove 24.
  • a tibial prosthesis is shown in the form of tibial component 40.
  • Tibial component 40 is a monoblock tibial prosthesis, i.e., is formed entirely from a single material, and is configured for independent attachment to the tibia, i.e., is attached to the tibia without the need for using an additional tibial component to support and/or retain tibial component 40 in position.
  • the articulating component is supported by and/or secured to a tray component.
  • tibial component 40 the need for a tray component is eliminated and tibial component 40 may be secured directly to a tibia in a known manner, such as by a press-fit or with bone cement, for example.
  • Tibial component 40 includes attachment surface 42 and articulating surfaces 44, 45.
  • Attachment surface 42 is configured for attachment to the bone stock of the proximal end of a tibia.
  • articulating surfaces 44, 45 are configured for articulation with articulating surfaces 20 of articulating material 14 of femoral component 10 and/or the condyles of a natural femur. While described and depicted herein as including two articulating surfaces 44, 45 that articulate with opposing natural or prosthetic femoral condyles, tibial component 40 may be formed as a unicondylar prosthesis having only a single articulating surface.
  • tibial component 40 is formed from a polymer, such as poly ether ether ketone, fiber reinforced poly ether ether ketone, ultrahigh molecular weight polyethylene, cross-linked ultrahigh molecular weight polyethylene, and polyether ketone ether ether ketone.
  • tibial component 40 may be formed from a hydrogel, such as polyvinyl pyrrolidinone, polyethylene ninyl alcohol, polystyrene allyl alcohol, and bisphenos.
  • tibial component 40 is formed from a metal, such as titanium, titanium alloy, cobalt chromium, cobalt chromium molybdenum, porous tantalum, and/or a highly porous biomaterial, for example.
  • tibial component 40 is formed from another class of materials, such as ceramics.
  • tibial component 40 may be formed from an oxide ceramic, such as alumina or zirconia; non-oxide ceramic, such as silicon nitride or silicon carbide; or other ceramic materials that are biologically inert, and yet are sufficiently hard and abrasion resistant.
  • tibial component 40 may be a monolith or, alternatively, may be formed form a plurality of discrete microscopic or macroscopic particles held in a matrix.
  • tibial component 50 is shown including body 51 and articulating portions 47, 49 defining articulating surfaces 54, 55.
  • Body 51 defines upper surface 61 attachment surface 52 for securement of tibial component 50 to a tibial tray and/or directly to a resected, proximal tibia.
  • articulating portions 47, 49 of tibial component 50 are formed independently of body 51 of tibial component 50.
  • articulating portions 47, 49 may be formed from a non- polymeric material, such as a biocompatible metal and/or ceramic.
  • articulating portions 47, 49 are formed from a metal
  • articulating portions 47, 49 may be formed from titanium, a titanium alloy, cobalt chromium, zirconium alloys, tantalum, and/or cobalt chromium molybdenum.
  • articulating portions 47, 49 are formed from a ceramic
  • articulating portions 47, 49 may be formed from oxide ceramic, such as alumina or zirconia; non-oxide ceramic, such as silicon nitride or silicon carbide; or other ceramic materials that are biologically inert, and yet are sufficiently hard and abrasion resistant.
  • body 51 is formed from a different class of materials, such as polymers, a highly porous biomaterial, or a hydrogel.
  • body 51 may be formed from polyethylene, a poly ether ether ketone, fiber reinforced poly ether ether ketone, ultrahigh molecular weight polyethylene, crosslinked ultrahigh molecular weight polyethylene, polyether ketone ether ketone, poly ether ketone ketone, polycarbonate urethane, polyphenylene, PrimoSpireTM self reinforced polyphenylene commercially available from SOLVAY Advanced Polymers, LLC, of Alpharetta, Georgia, and/or an antioxidant stabilized ultrahigh molecular weight polyethylene, for example.
  • body 51 may be formed from polyvinyl pyrrolidinone, polyethylene ninyl alcohol, polystyrene allyl alcohol, and bisphenos.
  • body 51 formed, for example, from a polymer, acts to provide cushioning and/or to dampen the shock transmitted to the knee prosthesis during normal joint articulation.
  • body 51 of tibial component 50 may exhibit some elasticity during loading to allow axial deflection and/or deformation of the body 51 between the proximal tibia and articulating portions 47, 49.
  • pressures exerted on tibial component 50 may be partially absorbed and dispersed by body 51 with little or no wear of articulating portions 47, 49.
  • the metallic and/or ceramic portions of tibial components 40, 50 may be treated by nitriding or coated with titanium nitride, chromium nitride, molybdenum disulfide, or zirconium nitride. Further, when body 51 is formed from a highly porous biomaterial, a good implant fixation may be achieved.
  • articulating portions 47, 49 may be press-fit into body 51.
  • articulating portions 47, 49 may include a peg or plurality of pegs extending therefrom onto which body 51 may be molded, such as by injection or compression molding, or otherwise formed.
  • Articulating portions 47, 49 may also be secured to body 51 of tibial component 50 with an adhesive, by welding, or by sol gel processing. Regardless of the method used to secure articulating portions 47, 49 to body 51, articulating portions 47, 49 are positioned such that articulating surfaces 54, 55 are flush with upper surface 61 of body 51, as shown in Fig. 11 with respect to articulating surface 54.
  • articulating portions 47, 49 are surrounded and supported by body 51.
  • attachment of articulating portions 47, 49 to body 51 is improved by body 51 fully supporting and surrounding articulating portion 47, 49.
  • articulating surfaces 54, 55 of articulating portions 47, 49 substantially flush with upper surface 61 of body 51, smooth articulation of a femoral prosthesis and/or the natural femur with tibial component 50 is achieved.
  • articulating surfaces 54, 55 of articulating portions 54, 55 may also include a plurality of dimples 56, such as those disclosed in U.S. Patent Application Number 11/684,028, the entire disclosure of which is expressly incorporated by reference herein.
  • Dimples 56 facilitate the retention of synovial fluid and/or other fluids on tibial component 50 to provide lubrication to articulating surfaces 54, 55.
  • dimples 56 include dimpling, laser ablation, and/or honing may be utilized.
  • dimples 56 have an RSa roughness of less than 10 micrometers. By having a RSa roughness of less than 10 micrometers, any interference of dimples 56 with the articulation of femoral component 10 and tibial component 50 is substantially eliminated.
  • chemical or electrolytic polishing may be utilized.
  • dimples 56 may also be applied to articulating surfaces 44, 45 of tibial component 40 and/or articulating surfaces 20 of femoral component 10.
  • Tibial tray component 100 includes plate 102, keel 104, and stem 106. Stem 106 and keel 104 are configured for receipt within the intramedullary canal of the tibia. Keel 104 acts to provide stabilization to tray component 100 and prevent rotation of tray component 100 once tray component 100 has been implanted in the tibia.
  • Plate 102 includes lower surface 108 configured to seat against a resected portion of the proximal tibia.
  • Support surface 110 of plate 102 is configured to receive and support body 51 of tibial component 50 thereon.
  • body 51 is secured to plate 102 by forming a snap-fit or an interference fit with plate 102.
  • plate 102 includes rim portions 112 extending upwardly from support surface 110.
  • Body 51 of tibial component 50 may be includes recesses that engage rim portions 112 to form a snap-fit or, alternatively, body 51 may be sized such that perimeter surfaces of body 51 form an interference fit with rim portions 112.
  • tray component 100 is formed from a metal.
  • tray component 100 may be formed from titanium, a titanium alloy, cobalt chromium, cobalt chromium molybdenum, stainless steel, porous tantalum, and/or a highly porous biomaterial.
  • three different materials may be used to form a tibial prosthesis that supports a femoral component or the natural femur atop a resected proximal tibia during knee articulation.
  • a first material may be used to form articulating portions 47, 49 of tibial component 50
  • a second material may be used to form body 51 of tibial component 50
  • a third material may be used to form plate 102 of tray component 100.
  • articulating portions 47, 49 may be formed from a ceramic
  • body 51 of tibial component 50 may be formed from a polymer
  • tray component 100 may be formed from a metal.
  • articulating portions 47, 49 of tibial component 50 are formed from a first metal
  • body 51 of tibial component 50 is formed from a polymer
  • plate 102 of tray component 100 is formed from a second metal, which is different than the first metal.
  • Tibial component 60 is substantially similar to tibial component 40 and corresponding reference numerals have been used to identify identical or substantially identical features therebetween.
  • Tibial component 60 further includes chamber 46 formed therein. Specifically, chamber 46 is formed within tibial component 60 between attachment surface 42 and articulating surface 44. Chamber 46 may have a length of up to substantially 10 mm and a height of up to substantially 3 mm. As a result of forming tibial component 60 as a monoblock or monolith, sufficient rigidity and strength is provided by tibial component 60 even after chamber 46 is formed therein.
  • Passageways 48 which in one exemplary embodiment are microsized, extend from chamber 46 to articulating surface 44 of tibial component 60.
  • fluid such as an antibiotic, medicinal, synovial, and/or other fluids, may be received within chamber 46. Then, during natural articulation of tibial component 60 with femoral component 10, the fluid contained within chamber 46 may travel through passageways 48 and exit to articulating surfaced 44.
  • chamber 46 and passageways 48 in conjunction with tibial component 60, a mechanism for providing continual lubrication or medicinal treatment to the knee joint is provided.

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Physical Education & Sports Medicine (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)
  • Prostheses (AREA)

Abstract

L'invention concerne une prothèse fémorale qui peut être formée en tant que composant fémoral incorporant un matériau de base et un matériau d'articulation. Dans un mode de réalisation donné à titre d'exemple, le matériau de base est un métal et le matériau d'articulation est un polymère. Plus précisément, le matériau de base procure de la force et de la rigidité au composant fémoral, alors que le matériau d'articulation entre en contact avec une prothèse tibiale ou le tibia naturel pendant l'articulation de la jointure. Dans un mode de réalisation donné à titre d'exemple, le matériau d'articulation forme la surface d'articulation d'une ou de plusieurs parties de condyle du composant fémoral.
PCT/US2009/030956 2008-01-14 2009-01-14 Système du genou et son procédé de fabrication Ceased WO2009091802A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US2090008P 2008-01-14 2008-01-14
US61/020,900 2008-01-14

Publications (2)

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WO2009091802A2 true WO2009091802A2 (fr) 2009-07-23
WO2009091802A3 WO2009091802A3 (fr) 2010-01-07

Family

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PCT/US2009/030956 Ceased WO2009091802A2 (fr) 2008-01-14 2009-01-14 Système du genou et son procédé de fabrication

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015034471A1 (fr) * 2013-09-03 2015-03-12 Massachusetts Institute Of Technology Articulations orthopédiques fournissant un pouvoir lubrifiant amélioré
US9585757B2 (en) 2013-09-03 2017-03-07 Massachusetts Institute Of Technology Orthopaedic joints providing enhanced lubricity
WO2018237288A1 (fr) 2017-06-23 2018-12-27 Forcast Orthopedics, Inc. Procédé, système et appareil pour apporter un remède à un genou
CN109662810A (zh) * 2019-03-01 2019-04-23 安徽工程大学 一种人工膝关节
WO2021094382A1 (fr) * 2019-11-12 2021-05-20 Depuy Ireland Unlimited Company Prothèse orthopédique composite et son procédé de fabrication
US11266493B2 (en) 2015-06-18 2022-03-08 Nicholas Testa Eyelid supporters and related methods
CN120168178A (zh) * 2025-03-24 2025-06-20 北京大学第三医院（北京大学第三临床医学院） 一种低磨损膝关节置换假体制备方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2657007B1 (fr) * 1990-01-12 1998-01-02 Innovations Technolog Ste Civi Piece femorale pour prothese du genou et procede pour la realisation d'un bandage propre a son equipement.
CA2226239A1 (fr) * 1997-01-17 1998-07-17 Ceramtec Ag Fixation d'un element de structure ceramique a une partie femorale au moyen d'un composant a glissement
WO2001080772A1 (fr) * 2000-04-21 2001-11-01 Behrooz Tohidi Articulation artificielle resistante a l'usure
US20080288081A1 (en) * 2007-05-16 2008-11-20 Joel Scrafton Implant articular surface wear reduction system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015034471A1 (fr) * 2013-09-03 2015-03-12 Massachusetts Institute Of Technology Articulations orthopédiques fournissant un pouvoir lubrifiant amélioré
US9585757B2 (en) 2013-09-03 2017-03-07 Massachusetts Institute Of Technology Orthopaedic joints providing enhanced lubricity
US11266493B2 (en) 2015-06-18 2022-03-08 Nicholas Testa Eyelid supporters and related methods
WO2018237288A1 (fr) 2017-06-23 2018-12-27 Forcast Orthopedics, Inc. Procédé, système et appareil pour apporter un remède à un genou
EP3641701A4 (fr) * 2017-06-23 2021-03-17 Forcast Orthopedics, Inc. Procédé, système et appareil pour apporter un remède à un genou
US11273044B2 (en) 2017-06-23 2022-03-15 Forcast Orthopedics, Inc. Method, system, and apparatus for antibiotic dispensing knee prosthesis
CN109662810A (zh) * 2019-03-01 2019-04-23 安徽工程大学 一种人工膝关节
WO2021094382A1 (fr) * 2019-11-12 2021-05-20 Depuy Ireland Unlimited Company Prothèse orthopédique composite et son procédé de fabrication
US11471287B2 (en) 2019-11-12 2022-10-18 Depuy Ireland Unlimited Company Composite orthopaedic prosthesis and method of making the same
CN120168178A (zh) * 2025-03-24 2025-06-20 北京大学第三医院（北京大学第三临床医学院） 一种低磨损膝关节置换假体制备方法

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