Revision knee tibial locking mechanism
AssigneeBiomet Manufacturing, LLC
InventorRobert Metzger
Life of this patent
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Abstract
A tibial prosthesis assembly can comprise a tibial tray and a tibial insert. The tibial tray can have an inferior bone engaging surface, a superior surface, and a first retaining feature. The tibial insert can have an inferior tray engaging surface, a superior bearing surface, and a second retaining feature. The first and second retaining features can cooperate to inhibit substantial lift-off of the tibial insert away from the superior surface of the tibial tray while permitting a predetermined amount of rotation of the tibial insert around the superior surface in an assembled position.
Claims14
A tibial prosthesis assembly comprising:
- a tibial tray having an inferior bone engaging surface, a superior surface and a first retaining feature;
- and
- a tibial insert having an inferior tray engaging surface, a superior bearing surface and a second retaining feature;
- wherein the first and second retaining features cooperate to inhibit substantial lift-off of the tibial insert away from the superior surface of the tibial tray while permitting a predetermined amount of rotation of the tibial insert around the superior surface in an assembled position;
- wherein the first retaining feature comprises at least one post extending from the superior surface on an anterior portion of the tibial tray;
- and
- wherein the first retaining feature further comprises a posterior projection extending from the superior surface on a posterior portion of the tibial tray, the posterior projection having an overhang that cooperates with the superior surface of the tibial tray to define a horizontal groove thereat.
A tibial prosthesis assembly comprising:
- a tibial tray having an inferior bone engaging surface, a superior surface and a first retaining feature, the first retaining feature comprising a pair of posts extending from the superior surface of an anterior portion of the tibial tray, the pair of posts collectively defining a posterior horizontal groove;
- a tibial insert having an inferior tray engaging surface, a superior bearing surface and a second retaining feature, the second retaining feature comprising a horizontal insert groove defined between an inferior ledge and an opposing surface of the tibial insert;
- and
- a locking member that selectively locates into the horizontal insert groove and the posterior horizontal groove to inhibit substantial lift-off of the tibial insert away from the superior surface of the tibial tray while permitting a predetermined amount of rotation of the tibial tray around the superior surface in an assembled position.
Dependencies are inferred from the claim text.