Background: Three-dimensional (3D) printing is a technology capable of creating solid objects based on the reproduction of computerised images. This technology offers revolutionary impacts on surgical practice, especially in prosthetic and traumatological surgery. Methods: 20 patients with proximal humeral fractures were divided into two groups, one of which involved the processing of a 3D model. The model made it possible to plan the positioning and dimensions of the implants. The results were then compared with those obtained according to the usual procedures. We also reported the irreparable case of a custom revision implants acetabular bone loss treated with a 3D-printed, custom-made implant. Results: In the processed 3D proximal humeral fracture series, in the face of time and costs expenses, surgical and X-ray times were shorter than in the control group. On the other hand, there were no differences in terms of blood loss. The patient who underwent acetabular re-prosthetic surgery in a 3B Paprosky bone loss was managed and solved with a 3D-printed, custom-made implant and reported excellent outcomes at a 1 year follow-up. Conclusion: Three-dimensional printing made it possible to create better pre-operative planning in traumatology in order to optimise surgical procedures and outcomes. It also made it possible to deal with large losses of bone stock in prosthetic revision surgery, even when reconstruction may have appeared impossible with traditional implants.
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