This book plunges you into the vast and innovative field of additive manufacturing focusing on laser fusion on a powder bed for the production of medical implants. We explore the numerical simulation of the SLM/LBM process applied to a Ti-6Al-4V titanium superalloy femoral stem using Simufact Additive software. In addition the application of topological optimization with lattice structures on a femoral component of a knee prosthesis is studied. This optimization carried out using nTopology software is validated by a static analysis performed with ANSYS guaranteeing the reliability of the results obtained.