Tibial prosthesis with independent medial and lateral baseplates
AssigneeIntermedics Orthopedics, Inc.
InventorsLawrence D. Dorr, Brian D. Burkinshaw, Joseph S. Skraba
Life of this patent
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Abstract
A tibial prosthesis with independent medial and lateral baseplates. The baseplates can be coupled together for simultaneous implantation using an implantation apparatus. A high-molecular weight polyethylene upper part with articulating surface can then be attached both to the baseplates and to the tibia. The resulting prosthesis can conform to the stabil condition of the tibia without rocking in the baseplates. Bony ingrowth from the tibial head into special surfaces of the baseplates securely attaches the baseplates to the tibial head and the possibility of diminished fixation is reduced.
Claims49
A tibial prosthesis comprising
- a separate medial baseplate adapted to be affixed to a medial surface at a head of a patient's tibia, said medial baseplate having a bottom side and a top side;
- means on said bottom side of said medial baseplate for independently securing said baseplate to said tibia;
- a separate lateral baseplate adapted to be affixed to a lateral surface at the head of the tibia, said lateral baseplate having a bottom side and a top side;
- means on said bottom side of said lateral baseplate for independently securing said baseplate to said tibia;
- and
- an upper part having medial and lateral articulating surfaces and connected to both the medial baseplate and the lateral baseplate, respectively, at the top sides thereof.
A method for implanting a prosthetic tibia comprising the steps of:
- resecting a generally flat surface at a head of a tibia;
- preparing the surface to receive the tibial implant;
- attaching a medial baseplate and a lateral baseplate to an apparatus adapted to hold the separate medial baseplate and the separate lateral baseplate in fixed relationship to each other;
- securing the medial baseplate and the lateral baseplate to the resected surface;
- removing the apparatus from the baseplates;
- and
- attaching an upper part having medial and lateral articulating surfaces to both the medial baseplate and the lateral baseplate, respectively.
Dependencies are inferred from the claim text.