Patent ID: 8147557

Claim:
A mobile tibial assembly comprising: a tibial tray configured to be coupled to a surgically-prepared surface of the proximal end of a tibia, the tibial tray including a platform having an upper surface and a channel extending along a longitudinal axis, the channel being formed in the upper surface to define spaced-apart first and second side walls and a bottom surface therebetween having a width extending transverse to the longitudinal axis, and a unicompartmental tibial insert including a platform and a stem extending downwardly from the platform and received within the channel of the tibial tray, the platform including (i) a bottom surface configured to engage the upper surface of the platform of the tibial tray and (ii) a generally circular upper bearing surface having a center and defining a dwell point offset from the center, wherein (i) the center of the upper bearing surface and a midpoint of the width of the bottom surface of the channel lie on the longitudinal axis of the channel, and (ii) the dwell point of the tibial insert is spaced-apart from the midpoint of the width of the bottom surface of the channel in the medial/lateral direction.