Orthopaedic implant system with bone conserving features
AssigneeDePuy Synthes Products, Inc.
InventorsStephen E. White, William J. Maloney
Life of this patent
Estimating the term…
Abstract
A tibial insert includes an articular surface and a bottom surface opposite the articular surface. The bottom surface includes one or more bone-conserving features. In some embodiments, the bottom surface may be curved to match a curvature of the articular surface such that a thickness of the tibial insert is relatively constant. In other embodiments, the bottom surface may be relatively planar but include a protrusion extending from a planar base surface to maintain a minimum thickness of the tibial insert. The described features may be incorporated in a uni-compartmental tibial prosthesis, a bi-compartmental tibial prosthesis, or a total knee prosthesis.
Claims20
A uni-compartmental tibial insert comprising:
- an anterior end and a posterior end;
- an articular surface extending from the anterior end to the posterior end and configured to articulate with a corresponding condyle of a natural or prosthetic femur;
- and
- a bottom surface, opposite the articular surface, extending from the anterior end to the posterior end and configured to couple with a uni-compartmental tibial tray, wherein the bottom surface is non-planar,
- wherein a perpendicular distance between the articular surface and the bottom surface defines a thickness of the tibial insert, and wherein the thickness of the tibial insert is constant between the anterior end and the posterior end.
A uni-compartmental tibial insert comprising:
- an anterior end and a posterior end;
- an articular surface extending from the anterior end to the posterior end and configured to articulate with a corresponding condyle of a natural or prosthetic femur;
- and
- a bottom surface, opposite the articular surface, extending from the anterior end to the posterior end and configured to couple with a uni-compartmental tibial tray, wherein the bottom surface includes a planar base surface and a protrusion extending from the planar base surface, wherein the protrusion has a curved outer surface.
A tibial knee prosthesis comprising:
- an anterior side and a posterior side;
- a medial articular surface extending from the anterior side to the posterior side and configured to articulate with a medial condyle of a natural or prosthetic femur;
- a lateral articular surface extending from the anterior side to the posterior side and configured to articulate with a lateral condyle of the natural or prosthetic femur;
- and
- a bottom surface, opposite the medial and lateral articular surfaces, extending from the anterior side to the posterior side, wherein the bottom surface includes a planar base surface and a protrusion extending from the planar base surface below the medial articular surface or the lateral surface, wherein the protrusion has a curved outer surface.
Dependencies are inferred from the claim text.