With increasing numbers of primary knee arthroplasties, the relevance and frequency of prosthesis replacement operations are increasing with a time lag. Two-zone anchoring is important. Due to bony defects, the articular surface can often no longer be used as a possible anchoring zone, so the fixation must take place in the metaphyseal and diaphyseal area of the bone. If, for various reasons, the defect is too pronounced for regular care, individually-manufactured implants can be used. These are produced on the basis of a preoperative CT as part of a two-stage change using industrial 3D printers and so-called additive manufacturing.
Keywords: 3D Printing; Diaphysis; Endoprosthesis; Revision surgery; Total knee replacement.