VIDEO / A revolutionary implant saved a patient's leg from amputation: It is made with 3D technology and weighs only 300 grams

A groundbreaking surgical procedure has saved the leg of a 38-year-old French man suffering from an aggressive bone sarcoma, using a revolutionary 3D-printed implant made from metamaterials. The operation was conducted at the Gregorio Marañón University Hospital in Madrid, in collaboration with engineers from the Universidad Politécnica de Madrid (UPM). The patient, named Pierre Chazel, had been facing the possibility of amputation due to extensive damage to his tibia and fibula caused by the tumor. However, the innovative approach allowed him to retain both his leg and knee, marking a major advancement in orthopedic surgery. The implant, weighing just 300 grams, was designed using advanced 3D printing technology and tailored specifically to Pierre’s anatomy. Unlike traditional prosthetics, which often rely on rigid materials and lack personalized adaptation, this new device mimics the load distribution mechanisms of natural bone. Its internal structure consists of a network of ultra-thin titanium filaments arranged to replicate how real bone distributes forces throughout the body. This design enables the remaining healthy bone to gradually integrate with the implant while its porous structure reduces unnecessary weight. The process began with detailed imaging scans of Pierre’s leg, allowing medical professionals to create a digital model of his unique anatomy. Engineers then simulated the mechanical stresses placed on the tibia during daily activities such as walking, climbing stairs, and maintaining balance. Based on these simulations, they crafted the internal framework of the implant, along with the placement of screws, ensuring optimal utilization of the healthy bone tissue. One of the key advantages of this method lies in its level of customization. By designing the implant specifically for Pierre, surgeons were able to plan the operation more precisely and potentially shorten the duration of the procedure. The hospital already has experience with 3D planning, biometric models, and implants tailored to individual patients, demonstrating a growing trend toward hyper-personalized surgical solutions. For Pierre, the outcome has been particularly significant. After nearly two years of relying on crutches and being unable to bear weight on his operated leg, he regained mobility within a year following the surgery. He now reports gradual improvement in movement and function, offering hope to other patients facing similar challenges. This case is not isolated. The hospital in Madrid has already performed a second similar procedure and is preparing additional personalized implants for different joints, including the wrist and rib cage. The integration of medicine, 3D printing, and computational modeling represents a crucial step toward hyper-personalized surgery, where implants are created directly based on the recipient's body rather than selected from standardized sizes.