Orthopedic implant with angled pegs
An orthopedic implant, such as a tibial tray, includes a body having a bone contacting surface with at least one and preferably two pegs extending from the bone contacting surface. Each of the pegs has a longitudinal axis angled with respect to the bone contacting surface and also angled in at least one direction consisting of a medial-lateral direction, an anterior-posterior direction and an inferior-superior direction. In the case of the tibial tray, the pegs form a non-perpendicular angle with the bone contacting surface of the baseplate and are angled in both a posterior direction and a medial or lateral direction.
1. A tibial implant comprising:
a plate having a generally planar bone contacting surface bisected by an anterior-posterior plane generally parallel to a sagittal plane of the body and four pegs extending outwardly from said bone contacting surface, each of said pegs having a longitudinal axis angled between 30 and 45° with respect to said planar bone contacting surface when measured in first, second, third and fourth planes perpendicular to the plane of the bone contacting surface, each plane containing a respective single peg longitudinal axis and the first, second, third and fourth planes of each peg angled at an angle of 5° to 90° with respect to said anterior-posterior plane with 90° being perpendicular to the anterior-posterior plane wherein the peg longitudinal axis of each peg extend in parallel.
2. The tibial implant as set forth in claim 1 wherein the plane containing the peg axis is angled at an angle between 15° and 60° with respect to the anterior-posterior plane.
3. The tibial implant as set forth claim 2 wherein the plane containing peg axis is angled with respect to the anterior-posterior plane is between 30° and 45°.
4. The tibial implant as set forth in claim 1 wherein the implant has two pegs which are configured to extend into the area of the resected medial condyle of the tibia and two pegs which are configured to extend into the resected tibia in the area of the lateral condyle.
5. The tibial implant as set forth in claim 4 wherein each plane containing the peg axis is angled at an angle with respect to the anterior-posterior plane bisecting the bone contacting surface of between 30° and 45°.
6. The tibial implant as set forth in claim 4 wherein each plane containing the peg axis is angled at an angle of between 15° and 60° with respect to the anterior-posterior plane.
7. The tibial implant as set forth in claim 1 wherein the pegs are generally cylindrical.
8. The tibial implant as set forth in claim 1 wherein each peg has a conically tapered end portion and said plate has a conically tapered bore for receiving said tapered peg end portion.
9. A kit for a prosthetic knee implant comprising:
a plurality of different size tibial baseplates having planar bone contacting surfaces having tapered bores therein; and
a plurality of pegs having angled and tapered end portions for coupling to said bores in the planar baseplate surface and opposite end portions for engaging a prepared tibia.
10. The kit as set forth in claim 9 wherein each peg has a conically tapered end and said baseplates have conically tapered bore for receiving said peg end.