CA2431096A1 - Porous unicondylar knee - Google Patents

Porous unicondylar knee Download PDF

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Publication number
CA2431096A1
CA2431096A1 CA002431096A CA2431096A CA2431096A1 CA 2431096 A1 CA2431096 A1 CA 2431096A1 CA 002431096 A CA002431096 A CA 002431096A CA 2431096 A CA2431096 A CA 2431096A CA 2431096 A1 CA2431096 A1 CA 2431096A1
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Canada
Prior art keywords
femoral component
bone contacting
contacting surface
post
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.)
Granted
Application number
CA002431096A
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French (fr)
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CA2431096C (en
Inventor
Robert A. Hodorek
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 Technology Inc
Original Assignee
Zimmer, Inc.
Robert A. Hodorek
Zimmer Technology, Inc.
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Publication of CA2431096A1 publication Critical patent/CA2431096A1/en
Application granted granted Critical
Publication of CA2431096C publication Critical patent/CA2431096C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • A61F2/38—Joints for elbows or knees
    • A61F2/3859—Femoral components
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
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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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    • 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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    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30574—Special structural features of bone or joint prostheses not otherwise provided for with an integral complete or partial collar or flange
    • A—HUMAN NECESSITIES
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    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30772—Apertures or holes, e.g. of circular cross section
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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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    • A61F2310/00395—Coating or prosthesis-covering structure made of metals or of alloys
    • A61F2310/00419—Other metals
    • A61F2310/00544—Coating made of tantalum or Ta-based alloys

Abstract

A unicondylar femoral component for use in a partial knee arthroplasty. A
femoral component of the present invention comprises a post and a flange having a pre-determined angle there between whereby a clamping force is placed on a patient's distal femur to hold the implant in place. The implant further comprises a porous layer on its bone contacting surface. In an alternative embodiment the femoral component is attached to the distal femur at least two threaded fasteners.

Claims (10)

1. A femoral component of a unicondylar endoprosthetic knee, wherein said femoral component is attached to a distal femur during a partial knee arthroplasty, the component comprising:
a convex arcuated articulating surface having a desired shape;
a bone contacting surface disposed opposite the articulating surface, wherein the bone contacting surface comprises a post extending from the bone contacting surface;
a flange disposed at the anterior end of the femoral component such that an angle of between about 1 degree and about 15 degrees is formed between the flange and the post.
2. The femoral component of claim 1, wherein the component comprises a material selected from the group consisting of cobalt-chrome alloy, titanium alloy, commercially pure titanium, and commercially pure cobalt.
3. The femoral component of claim 1, further comprising a porous layer attached to the bone contacting surface.
4. The femoral component of claim 3, wherein the porous layer comprises structured porous tantalum.
5. A femoral component for a unicondylar endoprosthetic knee implant comprising:
a convex articulating surface having a desired shape; and a bone contacting surface disposed opposite the articulating surface, wherein the bone contacting surface comprises a posterior post extending from the bone contacting surface and an anterior post extending from the bone contacting surface such that an angle of between about 1 degree and about 15 degrees is formed between the anterior post and the posterior post.
6. The femoral component of claim 5, wherein the component comprises a material selected from the group consisting of cobalt chrome alloy, titanium alloy, commercially pure titanium, and commercially pure cobalt.
7. The femoral component of claim 5, further comprising a porous Layer attached to the bone contacting surface.
8. The femoral component of claim 7, wherein, the porous layer comprises structured porous tantalum.
9. The femoral component of claims 1,3,5, or 7 further comprising at least two threaded fasteners, the fasteners disposed through the femoral component into the distal femur such that the fasteners do not interfere with the motion of the femoral component against a bearing surface.
10. The femoral component of claim 3 or 7, comprising a posterior flange disposed at an angle of between about 1 degree and about 15 degrees from the anterior flange, and no post.
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CA2431096C (en) 2011-01-11
AU2003204796A1 (en) 2004-01-15
US6797006B2 (en) 2004-09-28
JP2004016822A (en) 2004-01-22
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US20030233149A1 (en) 2003-12-18
AU2003204796B2 (en) 2008-08-21

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