WO1996038103A1 - Knee prosthesis - Google Patents

Knee prosthesis Download PDF

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Publication number
WO1996038103A1
WO1996038103A1 PCT/GB1995/002391 GB9502391W WO9638103A1 WO 1996038103 A1 WO1996038103 A1 WO 1996038103A1 GB 9502391 W GB9502391 W GB 9502391W WO 9638103 A1 WO9638103 A1 WO 9638103A1
Authority
WO
WIPO (PCT)
Prior art keywords
component
knee prosthesis
anterior
posterior
tibial
Prior art date
Application number
PCT/GB1995/002391
Other languages
French (fr)
Inventor
George John James Cremore
Derek Redvers Cooper
Peter Jeremy Gibson
Ian Hamilton Paling
Original Assignee
Corin Medical Limited
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 Corin Medical Limited filed Critical Corin Medical Limited
Publication of WO1996038103A1 publication Critical patent/WO1996038103A1/en

Links

Classifications

    • 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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/38—Joints for elbows or knees
    • A61F2/3868—Joints for elbows or knees with sliding tibial bearing
    • 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
    • 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
    • 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
    • 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
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • 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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • A61F2002/30133—Rounded shapes, e.g. with rounded corners kidney-shaped or bean-shaped
    • 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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • 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
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
    • A61F2002/30362—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit with possibility of relative movement between the protrusion and the recess
    • 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
    • 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
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • 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
    • 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
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004—Rounded shapes, e.g. with rounded corners
    • A61F2230/0015—Kidney-shaped, e.g. bean-shaped
    • 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
    • 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
    • A61F2310/00796—Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite

Definitions

  • the invention relates to a knee prosthesis, particularly to a three-part knee prosthesis.
  • An object of the invention is to provide a three-part knee prosthesis which mimics the action of the natural knee joint more closely than previously proposed arrangements.
  • the invention provides a knee prosthesis as set out in claim 1.
  • Advantageous features are set out in the subsidiary claims.
  • the freedom of movement allowed by the prosthesis of the invention is greatly suited to the task of a knee prosthesis.
  • Anterior-posterior movement is allowed, together with medial-lateral movement and rotational movement about a wide range of different superior-inferior axes. In each case, the amount of movement allowed is restricted.
  • rotation about a posterior axis is allowed at the extremes of medial-lateral movement. This is particularly advantageous in achieving a knee prosthesis which closely mimics the action of the natural knee joint.
  • Figure 1 is a side sectional view of a knee prosthesis according to the invention.
  • Figures 2(a) to 2(c) are, respectively, underneath, front, and side views of the meniscal component of the prosthesis of Figure 1;
  • Figures 3(a) to 3(c) are, respectively, plan, front and side views of the tibial component of the prosthesis of Figure 1.
  • the prosthesis 10 shown in Figure 1 consists of a femoral component 12, a meniscal component 20 and a tibial component 30.
  • the femoral component 12 is of standard design and shape, having fixing devices such as a femoral stem 14 or alternatively pegs or screws, and condyles 16.
  • the femoral component 12 forms no part of the present invention and will therefore be described no further here.
  • the meniscal component 20 is located between the femoral and tibial components 12, 30 and is shown in detail in Figures 2(a) to 2(c).
  • the overall shape of the meniscal component 20 is of standard design, having a generally planar lower surface 22 and an upper surface 24 comprising condylar surfaces.
  • the lower surface 22 of the meniscal component 20 also incorporates an anterior recess 26 and a posterior recess 28.
  • the anterior recess 26 is substantially part-circular in plan or underneath view, having a part-cylindrical inner wall 26a and a relatively wide opening 26b in the side wall of the meniscal component 20.
  • the posterior recess 28 has the general shape of an inverted U in the plan or underneath view, having an arcuate end wall 28a and substantially parallel side walls 28b. The distance between the parallel side walls 28b of the posterior recess 28 is less than the overall width of the anterior recess 26.
  • the tibial component 30 which supports the meniscal component 20 is illustrated in detail in Figures 3(a) to 3(c). Again, the overall design of the tibial component 30 is standard in that it has a planar upper surface or plateau 32, beneath which are located fixing devices such as pegs or stems 34. However, on the upper surface 32 are located an anterior peg or bollard 36 and a posterior peg or bollard 38. Each peg 36, 38 is substantially cylindrical in shape and upstands from the plateau 32 by no more than the depth of the corresponding anterior and posterior recesses 26, 28 in the meniscal component 20. The anterior peg 36 is smaller in diameter than the posterior peg 38.
  • the tibial component 30 supports the meniscal component 20 which in turn supports the femoral component 12.
  • the pegs 36, 38 engage in the recesses 26, 28 so that relative movement between the meniscal and tibial components 20, 30 is allowed but is restricted by the abutment of the pegs 36, 38 against the walls of the recesses 26, 28.
  • the relative dimensions and spacings of the pegs 36, 38 and the recesses 26, 28 are such that a maximum anterior-posterior movement of substantially 4mm is allowed and a maximum medial-lateral movement of substantially 7mm is allowed.
  • anterior recess 26 is wider than the posterior recess 28, and also that the anterior peg 36 is smaller in diameter than the posterior peg 38, means that, when the posterior peg 38 abuts against a side wall 28b of the posterior recess 28 at an extreme of medial-lateral movement, rotational movement of the meniscal component 20 with respect to the tibial component 30 about an axis passing through or close to the posterior peg 38 is still possible. This is advantageous in helping to mimic very closely the action of a natural knee joint.
  • the femoral and tibial components 12, 30 are manufactured from an implant-grade material, normally a colbalt-chrome alloy.
  • the upper surface 32 of the tibial component 30 is high polished so as to allow the planar lower surface 22 of the meniscal component 20, which is made from ultra high molecular weight polethylene or other suitable plastics material, to glide easily thereacros ⁇ .
  • Bone-contacting surfaces of the femoral and tibial components 12, 30 may have appropriately textured areas or coatings of materials to encourage bone-ingrowth such as Hydroxyappatite.
  • the invention is not limited to the precise embodiment described above. Various adaptations and modifications will be apparent to the skilled reader.
  • the relative sizes and spacings of the pegs and recesses may be altered to allow greater or less freedom of movement in any desired direction.
  • the pegs could be re-positioned on the meniscal component whilst the recesses could be formed in the tibial component.
  • Means for achieving posterior stabilisation of the prosthesis could additionally be provided between the meniscal and femoral components.

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  • 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

The Invention provides a knee prosthesis (10) comprising a femoral component (12), a tibial component (30) and a meniscal component (20) located between the femoral and tibial components (12, 30), interengaging means (26, 28, 36, 38) being provided between the tibial and meniscal components (30, 20) so as to allow limited anterior-posterior and rotational movement of the meniscal component (20) with respect to the tibial component (30), the interengaging means (26, 28, 36, 38) comprising anterior and posterior pegs (26, 28) and corresponding recesses (36, 38), wherein the pegs (26, 28) and corresponding recesses (36, 38) are configured so as to allow medial-lateral movement of the meniscal component (20) with respect to the tibial component (30) in addition to the anterior-posterior and rotational movement.

Description

KNEE PROSTHESIS
The invention relates to a knee prosthesis, particularly to a three-part knee prosthesis.
Strenuous efforts have been made to produce three-part knee prostheses which are capable of mimicking very closely the action of the natural knee joint. Inevitably, restraints acting between the tibial and meniscal components are normally required in order to provide the prosthesis with adequate stability. However, the restraints previously proposed are restrictive in that they prevent the prosthesis from moving in such a way that the action of the natural knee joint is very closely mimicked over the entire range of flexion.
An object of the invention is to provide a three-part knee prosthesis which mimics the action of the natural knee joint more closely than previously proposed arrangements.
The invention provides a knee prosthesis as set out in claim 1. Advantageous features are set out in the subsidiary claims.
The freedom of movement allowed by the prosthesis of the invention is greatly suited to the task of a knee prosthesis. Anterior-posterior movement is allowed, together with medial-lateral movement and rotational movement about a wide range of different superior-inferior axes. In each case, the amount of movement allowed is restricted. With a particularly advantageous embodiment of the invention, rotation about a posterior axis is allowed at the extremes of medial-lateral movement. This is particularly advantageous in achieving a knee prosthesis which closely mimics the action of the natural knee joint.
An embodiment of the present invention will now be described with reference to the accompanying drawings wherein: '
Figure 1 is a side sectional view of a knee prosthesis according to the invention;
Figures 2(a) to 2(c) are, respectively, underneath, front, and side views of the meniscal component of the prosthesis of Figure 1; and
Figures 3(a) to 3(c) are, respectively, plan, front and side views of the tibial component of the prosthesis of Figure 1.
The prosthesis 10 shown in Figure 1 consists of a femoral component 12, a meniscal component 20 and a tibial component 30. The femoral component 12 is of standard design and shape, having fixing devices such as a femoral stem 14 or alternatively pegs or screws, and condyles 16. The femoral component 12 forms no part of the present invention and will therefore be described no further here.
The meniscal component 20 is located between the femoral and tibial components 12, 30 and is shown in detail in Figures 2(a) to 2(c). The overall shape of the meniscal component 20 is of standard design, having a generally planar lower surface 22 and an upper surface 24 comprising condylar surfaces. The lower surface 22 of the meniscal component 20 also incorporates an anterior recess 26 and a posterior recess 28. The anterior recess 26 is substantially part-circular in plan or underneath view, having a part-cylindrical inner wall 26a and a relatively wide opening 26b in the side wall of the meniscal component 20. The posterior recess 28 has the general shape of an inverted U in the plan or underneath view, having an arcuate end wall 28a and substantially parallel side walls 28b. The distance between the parallel side walls 28b of the posterior recess 28 is less than the overall width of the anterior recess 26.
The tibial component 30 which supports the meniscal component 20 is illustrated in detail in Figures 3(a) to 3(c). Again, the overall design of the tibial component 30 is standard in that it has a planar upper surface or plateau 32, beneath which are located fixing devices such as pegs or stems 34. However, on the upper surface 32 are located an anterior peg or bollard 36 and a posterior peg or bollard 38. Each peg 36, 38 is substantially cylindrical in shape and upstands from the plateau 32 by no more than the depth of the corresponding anterior and posterior recesses 26, 28 in the meniscal component 20. The anterior peg 36 is smaller in diameter than the posterior peg 38.
When the prosthesis is assembled, the tibial component 30 supports the meniscal component 20 which in turn supports the femoral component 12. The pegs 36, 38 engage in the recesses 26, 28 so that relative movement between the meniscal and tibial components 20, 30 is allowed but is restricted by the abutment of the pegs 36, 38 against the walls of the recesses 26, 28. The relative dimensions and spacings of the pegs 36, 38 and the recesses 26, 28 are such that a maximum anterior-posterior movement of substantially 4mm is allowed and a maximum medial-lateral movement of substantially 7mm is allowed.
The fact that the anterior recess 26 is wider than the posterior recess 28, and also that the anterior peg 36 is smaller in diameter than the posterior peg 38, means that, when the posterior peg 38 abuts against a side wall 28b of the posterior recess 28 at an extreme of medial-lateral movement, rotational movement of the meniscal component 20 with respect to the tibial component 30 about an axis passing through or close to the posterior peg 38 is still possible. This is advantageous in helping to mimic very closely the action of a natural knee joint.
The femoral and tibial components 12, 30 are manufactured from an implant-grade material, normally a colbalt-chrome alloy. The upper surface 32 of the tibial component 30 is high polished so as to allow the planar lower surface 22 of the meniscal component 20, which is made from ultra high molecular weight polethylene or other suitable plastics material, to glide easily thereacrosε. Bone-contacting surfaces of the femoral and tibial components 12, 30 may have appropriately textured areas or coatings of materials to encourage bone-ingrowth such as Hydroxyappatite.
The invention is not limited to the precise embodiment described above. Various adaptations and modifications will be apparent to the skilled reader. For example, the relative sizes and spacings of the pegs and recesses may be altered to allow greater or less freedom of movement in any desired direction. Also, the pegs could be re-positioned on the meniscal component whilst the recesses could be formed in the tibial component. Means for achieving posterior stabilisation of the prosthesis could additionally be provided between the meniscal and femoral components.

Claims

CLAI MS
1. A knee prosthesis comprising a femoral component, a tibial component and a meniscal component located between the femoral and tibial components, interengaging means being provided between the tibial and meniscal components so as to allow limited anterior-posterior and rotational movement of the mensical component with respect to the tibial component, the interengaging means comprising anterior and posterior pegs and corresponding recesses, wherein the pegs and corresponding recesses are configured so as to allow medial-lateral movement of the meniscal component with respect to the tibial component in addition to the anterior-posterior and rotational movement.
2. A knee prosthesis as claimed in claim 1, wherein the medial-lateral movement allowed by the anterior peg and recess is greater than the medial-lateral movement allowed by the posterior peg and recess.
3. A knee prosthesis as claimed in claim 1 or 2, wherein the anterior recess is generally part-circular in plan view.
4. A knee prosthesis as claimed in any one of claims 1 to 3, wherein the posterior recess has an arcuate anterior end and substantially parallel sides.
5. A knee prosthesis as claimed in any one of the preceding claims, wherein both the anterior and posterior pegs are cylindrical in plan view.
6. A knee prosthesis as claimed in claim 5, wherein the diameter of the anterior peg is smaller than the e diameter of the posterior peg.
7. A knee prosthesis as claimed in any one of the preceding claims wherein the meniscal component is movable between 2mm and 6mm with respect to the tibial component in the anterior-posterior direction.
8. A knee prosthesis as claimed in claim 7, wherein the meniscal component is movable substantially 4mm with respect to the tibial component in the anterior-posterior direction.
9. A knee prosthesis as claimed in any one of the preceding claims, wherein the meniscal component is movable between 0.5mm and 10mm with respect to the tibial component in the medial-lateral direction.
10. A knee prosthesis as claimed in claim 9, wherein the meniscal component is movable substantially 7mm with respect to the tibial component in the medial-lateral direction.
11. A knee prosthesis as claimed in any one of the preceding claims, wherein the recesses are formed in the meniscal component and the pegs are located on the superior surface of the tibial component.
e
12. A knee prosthesis as claimed in any one of the preceding claims, wherein the femoral and tibial components are made of a colbalt-chrome alloy.
13. A knee prosthesis as claimed in any one of the preceding claims, wherein the meniscal component is made of ultra-high molecular weight polyethylene.
14. A knee prosthesis substantially as hereinbefore described with reference to the accompanying drawings.
PCT/GB1995/002391 1995-06-02 1995-10-10 Knee prosthesis WO1996038103A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9511152A GB2290476B (en) 1995-06-02 1995-06-02 Knee prosthesis
GB9511152.2 1995-06-02

Publications (1)

Publication Number Publication Date
WO1996038103A1 true WO1996038103A1 (en) 1996-12-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1995/002391 WO1996038103A1 (en) 1995-06-02 1995-10-10 Knee prosthesis

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WO (1) WO1996038103A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5879394A (en) * 1996-05-28 1999-03-09 Howmedica International Inc. Tibial element for a replacement knee prosthesis
US5928286A (en) * 1996-05-28 1999-07-27 Howmedica International Inc. Tibial element for a replacement knee prosthesis
US6090144A (en) * 1998-05-12 2000-07-18 Letot; Patrick Synthetic knee system
US6162254A (en) * 1997-10-14 2000-12-19 Tornier S.A. Knee prosthesis
FR2830435A1 (en) 2001-10-10 2003-04-11 Pierre Brugere Tibial implant for replacement knee joint comprises base plate with notch in shape of arc of circle in its rear edge and pin on its front edge which cooperate with seatings on tibial plate
US8137407B2 (en) 2004-03-09 2012-03-20 Zimmer, Inc. Tibial knee component with a mobile bearing

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989009579A1 (en) * 1988-04-11 1989-10-19 Albrektsson Bjoern Knee-joint prosthesis
EP0546726A1 (en) * 1991-11-28 1993-06-16 Biomet Limited Prosthetic knee joint
EP0551793A1 (en) * 1992-01-14 1993-07-21 SULZER Medizinaltechnik AG Meniscus platform for artificial knee joint
WO1995025484A1 (en) * 1994-03-24 1995-09-28 Corin Medical Limited Prosthesis assembly

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8432267D0 (en) * 1984-12-20 1985-01-30 Thackray C F Ltd Knee prosthesis
FR2698536B1 (en) * 1992-12-01 1996-07-05 Ysebaert Knee prosthesis.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989009579A1 (en) * 1988-04-11 1989-10-19 Albrektsson Bjoern Knee-joint prosthesis
EP0546726A1 (en) * 1991-11-28 1993-06-16 Biomet Limited Prosthetic knee joint
EP0551793A1 (en) * 1992-01-14 1993-07-21 SULZER Medizinaltechnik AG Meniscus platform for artificial knee joint
WO1995025484A1 (en) * 1994-03-24 1995-09-28 Corin Medical Limited Prosthesis assembly

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5879394A (en) * 1996-05-28 1999-03-09 Howmedica International Inc. Tibial element for a replacement knee prosthesis
US5928286A (en) * 1996-05-28 1999-07-27 Howmedica International Inc. Tibial element for a replacement knee prosthesis
US6162254A (en) * 1997-10-14 2000-12-19 Tornier S.A. Knee prosthesis
US6090144A (en) * 1998-05-12 2000-07-18 Letot; Patrick Synthetic knee system
US6506215B1 (en) 1998-05-12 2003-01-14 Patrick Letot Synthetic knee system
FR2830435A1 (en) 2001-10-10 2003-04-11 Pierre Brugere Tibial implant for replacement knee joint comprises base plate with notch in shape of arc of circle in its rear edge and pin on its front edge which cooperate with seatings on tibial plate
US8137407B2 (en) 2004-03-09 2012-03-20 Zimmer, Inc. Tibial knee component with a mobile bearing

Also Published As

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GB2290476B (en) 1999-02-10
GB9511152D0 (en) 1995-07-26
GB2290476A8 (en) 1998-09-02
GB2290476A (en) 1996-01-03

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