Knee replacement implant having stackable spacers

A knee replacement prosthesis for a patient, comprising:

• a distal femoral implant comprising:
• a femoral head portion comprising:
• an outer arcuate surface configured to mate with one of a tibial baseplate or a proximal surface of a tibia of the patient;
• an interior posterior surface;
• an interior distal surface disposed at a first angle with respect to the interior posterior surface;
• and
• a first interior intermediate surface joining the interior posterior surface and the interior distal surface, the first interior intermediate surface disposed at a second angle with respect to the interior posterior surface and at a third angle with respect to the interior distal surface;
• and
• a plurality of stackable femoral spacers, each comprising a respective first beveled edge, wherein:
• a first posterior spacer of the plurality of stackable femoral spacers is disposed directly against the interior posterior surface;
• and
• a second posterior spacer of the plurality of stackable femoral spacers is disposed directly against, and in a mirrored orientation with respect to, the first posterior spacer such that the respective first beveled edges of the first and second posterior spacers meet at a first common point.