This is an endo-exo prosthesis with a 3D printed & painted cosmetic cover of one of my patients. An endo-exo prosthesis has a titanium shaft that gets cemented into the thigh bone (this is the "endo" part of the prosthesis) and the external part of the prosthesis (the exo part). This patient wears an electronic knee joint. An endo-exo prosthesis with a modern knee joint allows for a very natural walk, as the forces flow directly into the thigh bone. Just like in a healthy leg.