Metal 3D printing, specifically Direct Metal Laser Sintering (DMLS) and Electron Beam Melting (EBM), has revolutionized the production of orthopedic implants. Traditional manufacturing of titanium hip or knee replacements involves forging and machining, which limits the complexity of the shape. In contrast, 3D printing allows for the creation of implants that are perfectly contoured to a patient’s bone loss or deformity.

One of the most significant advantages of metal 3D printing is the ability to create "trabecular" surfaces. These are micro-porous structures that mimic the "scaffolding" of natural bone. Technical insights into the laser power, powder grain size, and heat treatment protocols for medical-grade Titanium (Ti6Al4V) are found in the Digital 3D Printing Market resource. These porous surfaces allow for "biological fixation," where the bone grows directly into the metal, eliminating the need for bone cement and reducing the risk of implant loosening over time.

In spinal surgery, 3D-printed interbody cages are used to fuse vertebrae. Because these cages are printed digitally, they can be customized to the specific "lordosis" (curvature) of the patient's spine. This precision helps restore the natural alignment of the back and reduces the likelihood of adjacent segment disease. As metal 3D printing costs decrease, it is expected to become the standard for all complex reconstructive surgeries.