Patent ID: 8591596
Filing Date: 2013-11-26
Classification: A61F

Abstract:
1. A semi-constrained ankle prosthesis, comprising: a tibial component configured to be coupled to a surgically-prepared surface of the distal end of a tibia, the tibial component including (i) an annular sidewall that defines a recess and has an undercut formed therein and (ii) an outer sidewall that has an opening defined therein that opens into the recess, a polymeric bearing insert having an articular surface formed in an inferior surface thereof, the bearing insert being locked to the tibial component and rotative relative thereto and including (i) a single locking tab having a body and a flange extending anteriorly from the body and (ii) one and only one retaining flange that extends posteriorly when the bearing insert is in a first position, the retaining flange being positioned on only a portion of a posterior side of the polymeric bearing insert and positioned in a posterior section of the undercut formed in the annular sidewall when the bearing insert is in the first position, and a talar component configured to be coupled to a surgically-prepared surface of the proximal end of a talus, the talar component having an articular surface that is configured to articulate with the articular surface of the bearing insert, wherein the flange of the locking tab is wider than the opening formed in the outer sidewall of the tibial component and includes an inferior edge that is positioned in an anterior section of the undercut formed in the annular sidewall when the bearing insert is in the first position.