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US 2014/0277552 A1Published application
Joint replacement spacers
OwnerAlbert H. Burstein, Jonathan T. Delandinventors
Life of this patent
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Abstract
Devices and methods are disclosed for joint replacement.
Claims23
A spacer for (a) replacing a removed portion of a first bone, and (b) articulating with a second bone, the spacer comprising:
- an articulating surface sized and shaped to articulate with an articular surface of the second bone;
- and
- a stabilizing surface sized and shaped to conform to a cut surface of the first bone, wherein:
- the spacer defines first axis and a second axis not parallel to the first axis;
- in a cross-section of the spacer perpendicular to the first axis, the stabilizing surface defines a first curve including:
- a first portion with a first radius of curvature;
- and
- a second portion with a second radius of curvature not equal to the first radius of curvature;
- in a cross-section of the spacer perpendicular to the second axis, the stabilizing surface defines a second curve including:
- a third portion with a third radius of curvature;
- and
- a fourth portion with a fourth radius of curvature not equal to the third radius of curvature;
- and
- the second and fourth radii of curvature are not equal.
11 more elements
A method comprising:
- distracting a joint that comprises a first bone having a first articular surface and a second bone having a second articular surface;
- preparing the first bone by:
- removing the first articular surface of the first bone thereby creating a cut surface on the first bone, the cut surface defining a first axis and a second axis not parallel to the first axis;
- shaping the cut surface so that:
- in a cross-section of the cut surface perpendicular to the first axis, the cut surface defines a first curve including a first portion with a first radius of curvature, and a second portion with a second radius of curvature not equal to the first radius of curvature;
- in a cross-section of the cut surface perpendicular to the second axis, the cut surface defines a second curve including a third portion with a third radius of curvature, and a fourth portion with a fourth radius of curvature not equal to the third radius of curvature;
- and
- the second and fourth radii of curvature are not equal;
- placing a spacer against the cut surface of the first bone, the spacer having an articulating surface sized and shaped to articulate with an articular surface of the second bone, and a stabilizing surface sized and shaped to be substantially complementary to the cut surface;
- and
- reapproximating the joint such that the articulating surface of the spacer articulates with the second articular surface of the second bone, and the stabilizing surface of the spacer fully seats against the cut surface of the first bone.
8 more elements
A method comprising:
- distracting a joint that comprises a first bone having a first articular surface and a second bone having a second articular surface;
- providing a spacer having an articulating surface sized and shaped to articulate with an articular surface of the second bone, and a stabilizing surface a predetermined shape;
- and
- preparing the first bone by removing the first articular surface of the first bone thereby creating a cut surface sized and shaped to be substantially complementary to the stabilizing surface;
- placing the spacer against the cut surface of the first bone with the stabilizing surface facing the complementary cut surface of the first bone;
- and
- reapproximating the joint such that the articulating surface of the spacer articulates with the second articular surface of the second bone, and the stabilizing surface of the spacer fully seats against the cut surface of the first bone;
- wherein the shape of the stabilizing surface is defined by a combination of at least two surface-generating curves such that two geometrically independent aspects of the stabilizing surface are defined by non-constant curvature.
5 more elements
A spacer for (a) replacing a removed portion of a first bone, and (b) articulating with a second bone, the spacer comprising:
- an articulating surface sized and shaped to articulate with an articular surface of the second bone;
- and
- a stabilizing surface having a shape defined by a combination of at least two surface-generating curves such that two geometrically independent aspects of the stabilizing surface are defined by non-constant curvature.
Dependencies are inferred from the claim text.