EP0336774A1
Expired / Lapsed
EP
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Modular knee joint prosthesis
Assignee: Smith and Nephew Inc
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Filing: 1989-04-07
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Granted: —
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Expires: 2009-04-07
Abstract
Abstract A femoral component (12) base having a pair of laterally spaced apart condylar portions (14, 16), each of which has an external surface that is smoothly convexly curved anterior-posteriorly to match generally the distal profile of the anatomical femoral condyle and smoothly convexly curved laterally throughout its antero-posterior extent. The external convexly curved surfaces engage the tibial (13) component having a platform portion (17) laterally with spaced apart concavities (39, 41), each of which would receive one of the condylar portions (14, 16) of the femoral component to allow antero-posterior rotation between the components during use of the joint. The femoral component (12) includes a modular member (40) having adjustable plates (70) for adjusting the position of the femoral component in response to bone condition discovered during surgery. The tibial, femoral and modular components further include a triangular (60, 61, 62), ramp post and corresponding confined recess to limit flexion and undesirable lateral movement.
Inventors
- 👤 Ramon B. Gustilo
- 👤 James A. Rand
- 👤 Jeffrey G. Roberts
- 👤 Jennifer J. Lackey
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 08:52
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3886; A61F2002/30001; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30354; A61F2002/30535; A61F2002/30604; A61F2/30721; A61F2/30734; A61F2002/30736; A61F2220/00; A61F2220/0025; A61F2220/0033
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
102 words
A modular knee prosthesis, comprising: a) a tibial component, comprising a platform portion, the platform portion having a pair of oblong concavities; b) a femoral component, comprising a pair of condylar portions, each of the condylar portions including an external surface for registering with the concavities of the tibial component to allow traveling movement of the components in relation to one another for simulating the movement of a natural knee; and c) platform means, selectively positionable onto the femoral component for adjusting the thickness of the femoral base component, to provide a snug fit between the femoral component and the femoral condyle.
Claim 2
Dependent Claim
102 words
A modular knee prosthesis, comprising: a) a tibial component, comprising a platform portion, the platform portion having a pair of oblong concavities; b) a femoral component, comprising a pair of condylar portions, each of the condylar portions including an external surface for registering with the concavities of the tibial component to allow traveling movement of the components in relation to one another for simulating the movement of a natural knee; and c) platform means, selectively positionable onto the femoral component for adjusting the thickness of the femoral base component, to provide a snug fit between the femoral component and the femoral condyle.
Claim 3
Dependent Claim
32 words
The prosthesis set forth in Claim 1, including movement limit means mounted with the tibial component and the femoral base component to influence rotation of the knees in both directions of rotation.
Claim 4
Dependent Claim
30 words
The structure set forth in Claim 2, wherein the movement limit means includes means to limit relative transverse rotation of the tibial and femoral components with respect to each other.
Claim 5
Dependent Claim
21 words
The prosthesis in Claim 1, wherein the femoral base component includes a pair of femoral condyles with a intercondylar space therebetween.
Claim 6
Dependent Claim
57 words
The prosthesis in Claim 1, including: first tibial component having a movement limiting post; and platform means further including a tibial post traveling recess defined by a pair of vertical walls, said walls sloping anteriorally into the base of the platform from a superior point posterior of the platform, the walls intersected by a transverse stabilizer post.
Claim 7
Dependent Claim
42 words
The prosthesis in Claim 4, wherein a stabilizer post cams against a camming face of a movement limiting post of the tibial component during flexion of the knee to prevent movement of the femoral component out of registration with the tibial component.
Claim 8
Dependent Claim
41 words
The prosthesis in Claim 1, further comprising a means for mounting one or more modular plates of desired thickness to the platform means for selectively fitting the femoral component to the femoral condyle to compensate for any excessive loss of bone.
Claim 9
Dependent Claim
25 words
The prosthesis in Claim 1, further comprising a post member positionable on the platform means to assist in securing the femoral component to the femur.
Claim 10
Dependent Claim
134 words
A modular knee prosthesis, comprising: a) a lower tibial component, including a base portion having a pair of spaced apart oblong concavities, with a post member having a camming face, raised superiorly therebetween; b) a modular femoral component, comprising: i) a femoral component, including a pair of spaced apart condylar portions slidable in the concavities of the tibial portion; ii) a removable platform member positionable to register with inner surfaces of the femoral base portion; iii) means for securing platform portion in position intermediate the femoral component and a femur it is to be secured to; and iv) means, selectively positionable on the removable platform member, to adjust the thickness of the platform portion and the femur to compensate for excess bone loss during preparation of the femur for receiving the femoral component thereupon.
Claim 11
Dependent Claim
134 words
A modular knee prosthesis, comprising: a) a lower tibial component, including a base portion having a pair of spaced apart oblong concavities, with a post member having a camming face, raised superiorly therebetween; b) a modular femoral component, comprising: i) a femoral component, including a pair of spaced apart condylar portions slidable in the concavities of the tibial portion; ii) a removable platform member positionable to register with inner surfaces of the femoral base portion; iii) means for securing platform portion in position intermediate the femoral component and a femur it is to be secured to; and iv) means, selectively positionable on the removable platform member, to adjust the thickness of the platform portion and the femur to compensate for excess bone loss during preparation of the femur for receiving the femoral component thereupon.
Claim 12
Dependent Claim
35 words
The prosthesis in Claim 9, wherein the means to adjust the thickness includes one or more spacers further comprising a plurality of rectangular portions, positioned upon the platform portion for defining a thickened femoral portion.
Claim 13
Dependent Claim
22 words
The prosthesis in Claim 9, wherein the spacers are of varying thickness in order to adjust the thickness of the femoral component.
Claim 14
Dependent Claim
28 words
The prosthesis in Claim 9, wherein a post member is mounted with the platform member to provide a more secure attachment between the femur and the femoral component.
Claim 15
Dependent Claim
17 words
The prosthesis in Claim 10, wherein the rectangular portions are constructed of metal or other hard substance.
References Cited (Backward Citations)
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