| 主权项 |
1. A trial kit for a knee implant system, wherein the trial kit includes:
a tibial base plate trial, an adaptor and a tibial bearing insert trial; wherein the tibial base plate trial has an upper surface, a bottom surface, a button head extending upwardly beyond the upper surface, the button head having a knob and a reduced diameter neck extending from the knob toward the upper surface of the tibial base plate trial; the adaptor has a base including an upper surface, a lower surface spaced from the upper surface, a posterior face, an anterior face, and side surfaces between the upper and lower surfaces; the adaptor further includes an elongate post extending upwardly from the upper surface of the base to a superior end, the elongate post having a superior-inferior central longitudinal axis and a substantially cylindrical shape for a substantial portion of its length; the base of the adaptor has surfaces defining an adaptor channel in its lower surface extending from a posterior opening in the posterior face of the base in an anterior direction; the surfaces defining the adaptor channel are sized and shaped to define an undercut and are sized and shaped so that the adaptor can be mounted on the tibial base plate trial by sliding the adaptor in a posterior direction on the upper surface of the base plate trial until the knob of the button head is received in the adaptor channel, the sizes and shapes of the undercut in the adaptor channel and the knob and reduced diameter neck preventing the adaptor from lifting off the tibial base plate trial; the tibial bearing insert trial has a superior articulation surface, a spine extending superiorly beyond the superior articulation surface, and an inferior surface having a recess to receive the base of the adaptor; the tibial bearing insert trial has a surface within the recess defining an upper recess surface; the upper recess surface has an opening; the opening leads to a first insert channel in the spine of the tibial bearing insert trial; at least a portion of the first insert channel is sized, shaped and oriented to receive the elongate post of the adaptor to mount the tibial bearing insert trial on the adaptor and allow for the tibial bearing insert trial to move in a superior direction with respect to the adaptor; the tibial bearing insert trial can be assembled with the adaptor by inserting the superior end of the elongate post into the opening in the upper recess surface of the tibial bearing insert trial; the assembly of the tibial bearing insert trial and the adaptor can be mounted on the tibial base plate trial by sliding the assembly in a posterior direction on the upper surface of the tibial base plate trial until the button head is received within the adaptor channel. |
