Fig. 1

The STL files are imported in Mimics® and are fused with the raw images of the implants. Specific landmarks of the implants are used to do the manual fusion. On the tibia, three landmarks were used: (a) the anterior removal indentation of the polyethylene (blue arrow), (b) the most anterosuperior point of the polyethylene (yellow arrow), and the posterosuperior point of the cam (white arrow). The corresponding landmarks of the STL implant were then matched manually (c)