Variable Prosthesis
AssigneeBiomet Manufacturing, LLC
InventorsAaron P. SMITH, Kevin T. STONE, Nicholas M. CORDARO
Life of this patent
Estimating the term…
Abstract
The present teachings are directed to a shoulder prosthesis having an adjustable radial offset and/or angular inclination provided by relative rotation of an adapter interdisposed between a stem and a head. In one example, a prosthesis has a stem having a first longitudinal axis. The prosthesis can also include an adaptor including a first taper. The first taper can have a first taper axis. The prosthesis can include a head supported by the adaptor. The head can be selectively oriented and then coupled to the first taper and the combination can be selectively orientated and the coupled to the stem.
Claims20
A femoral prosthesis system, comprising:
- a femoral head having an articulating surface, a head female taper formed into the femoral head, wherein a head center axis of the femoral head is offset a first radial distance from a head taper center axis of the head female taper;
- an adapter having a first side, an opposed second side, an outer surface defining an adapter male taper, an adapter female taper formed into the adapter through the first side, and a stem facing taper surface, wherein an adapter center axis of the adapter is offset a second radial distance from an adapter female taper axis;
- and
- a femoral stem having a body and a neck, wherein the neck has an outer surface that defines a neck male taper,
- wherein the femoral head, the adapter, and the neck are selectively connected to form a selected femoral head offset relative to the femoral stem, and
- wherein the stem facing taper surface of the adapter is configured to provide clearance between the adapter and the femoral stem.
A method of implanting a femoral prosthesis system in a patient, comprising:
- determining an anteversion angle of a natural femur relative to a pelvis of the patient;
- selecting an adapter having an adapter center axis and an adapter offset connection, wherein the adapter offset connection has an adapter connection center axis;
- selecting a femoral head having a head center axis and an offset head connection, wherein the offset head connection has a head connection center axis;
- selecting a distance offset between the adapter connection center axis and the head connection center axis based on the determined anteversion angle;
- and
- rotating the selected adapter relative to the selected femoral head to achieve the selected distance offset between the adapter connection center axis and the head connection center axis.
A method of implanting a femoral prosthesis system in a patient, comprising:
- selecting a femoral head having a head center axis, an offset head connection, and a curved articulating surface, wherein the offset head connection has a head connection center axis that is displaced a distance from the head center axis, wherein the curved articulating surface is configured to articulate within at least one of a an acetabular prosthesis or an acetabulum in a pelvis of the patient;
- selecting an adapter having an adapter center axis and an adapter offset connection, wherein the adapter offset connection has an adapter connection center axis that is displaced a distance from the adapter center axis;
- selecting a distance offset between the adapter connection center axis and the head connection center axis based on a determined anteversion angle of a femur relative to the pelvis of the patient;
- and
- rotating the selected adapter relative to the selected femoral head to achieve the selected distance offset between the adapter connection center axis and the head connection center axis.
Dependencies are inferred from the claim text.