The use of 3D printing technology is very useful in surgery for treating fractures and several other orthopaedic surgeries. In this case we describe the pre-surgical planning of very severe deformity of proximal humerus secondary to an epiphysiolisis in an 8 year old girl with a calcium density model. It is based on a digital printing of the bone with calcium density material, which, to the best of our knowledge, has not been dealt with so far. This has allowed us to carry out a previous radiological analysis and better planning. This surgery has resulted in successful correction and has saved surgical time. The functionality of the patient was improved and a correction of the cervical-diaphyseal angle of 72º was achieved. We believe it can be very useful for planning similar operations. We highlight the use of materials that allow radiological checking as is the case of our model used ... [Llegir més ...]