Provisional tibial prosthesis system

A tibial prosthesis system for implantation on a resected surface of a proximal tibia, the tibial prosthesis system comprising:

• a bearing component having a superior surface and an inferior surface;
• a base component having a superior surface and an inferior surface, wherein the base component having a protrusion extending from the superior surface and configured to mate with a recess in the bearing component, the protrusion having a first feature configured to couple with a second feature of the bearing component when the protrusion is inserted into the recess to prevent significant relative movement between the bearing component and the base component in a medial/lateral direction and an anterior/posterior direction, and wherein the first feature and the second feature are configured to allow the bearing component to be movable relative to the base component in a proximal/distal direction;
• and
• a shim component insertable between the inferior surface of the bearing component and the superior surface of the base component, wherein upon insertion the shim component is configured to engage both the bearing component and the base component to restrain the bearing component from significant relative movement in the proximal/distal direction relative to the base component, and wherein the shim component is configured to be disposed between the inferior surface of the bearing component and the superior surface of the base component.

A method of performing a surgical procedure on a portion of a knee joint, the method comprising:

• implanting a base component on a resected tibia;
• coupling a bearing component to the base component, the bearing component and base component having mating features configured to prevent significant relative movement between the bearing component and the base component in a medial/lateral direction and an anterior/posterior direction;
• coupling a first shim component with the bearing component and the base component to restrain the base component and the bearing component from relative movement in a proximal/distal direction, wherein the mating features are configured to allow the bearing component to be movable relative to the base component in a proximal/distal direction;
• and
• performing range of motion testing to verify proper sizing of a combination of the bearing component, the base component, and the first shim component.

A tibial shim component for use with a tibial prosthesis system for implantation on a resected surface of a proximal tibia, the tibial shim component comprising:

• a posterior side;
• an anterior side opposing the posterior side;
• a superior surface extending between the posterior side and the anterior side;
• an inferior surface opposing the superior surface;
• a notch formed on the posterior side of the shim component, wherein the notch is configured to engage with a feature of a base component;
• and
• one or more rails extending from the superior surface of the shim component and configured to engage with one or more slots of a bearing component.