Knee arthroplasty system

An arthroplasty system comprising:

• a unicondylar tibial tray implant including a unicondylar bearing engaging surface;
• and
• a total tibial tray implant including a medial bearing engaging surface and a lateral bearing engaging surface;
• wherein the unicondylar bearing engaging surface is substantially similar to the medial or the lateral bearing engaging surfaces in size and shape.

An arthroplasty system comprising:

• a unicondylar tibial tray implant including a unicondylar bearing engaging surface;
• a total tibial tray implant including a medial bearing engaging surface, a lateral bearing engaging surface, and an intercondylar portion between the medial bearing engaging surface and the lateral bearing engaging surface, the unicondylar bearing engaging surface is substantially similar to the medial or the lateral bearing engaging surfaces in size and shape;
• a tibial bearing configured to couple with the unicondylar tibial tray implant at the unicondylar bearing engaging surface, and configured to couple with the total tibial tray implant at one of the medial bearing engaging surface and the lateral bearing engaging surface;
• a unicondylar femoral implant;
• and
• a total femoral implant;
• wherein each one of the unicondylar femoral implant and the total femoral implant are configured to articulate with the tibial bearing;
• and
• wherein each one of the unicondylar tibial try implant, the total tibial tray implant, the tibial bearing, the unicondylar femoral implant, and the total femoral implant are sized and shaped based on the same anatomic data.