On the 14th of this month, the Department of Orthopaedics and Traumatology of our hospital performed a “personalized” surgery for a 70-year-old patient, Lu Tai Tai, with 3D printing technology-assisted artificial total knee replacement. The hospital also became the first hospital in South Central region to use 3D printing technology to assist orthopedic surgery. The patient, Lu Tai Tai, started to experience pain in both knees 10 years ago. In recent years, the knee pain has gradually worsened, especially when going up and down stairs and squatting. On September 22, Lu came to our hospital accompanied by her family and was diagnosed with “knee osteoarthritis” and admitted to our hospital. Professor Lu Min took into account the fact that she was old and weak, and suffered from hypertension, diabetes and other medical diseases. In order to minimize the trauma of the surgery and minimize the risk of the surgery. On the morning of the 14th, with Professor Lu’s excellent skills and rich clinical experience in the field of bone and joint, and with the assistance of the 3D knee joint, she successfully completed her “personalized” surgery in only 1/3 of the conventional surgery time. “The surgery was performed in 1/3 of the usual time. In the past, when a knee replacement was performed, the bone was removed during the surgery, and the image tended to be flat because the surgeon could only see the patient’s bone structure from the image results before the surgery. With the gradual maturation of 3D printing technology, the 3D scanning technology can be used to print a 1:1 model using polymer materials, allowing the surgeon to “visualize” the complexity of the patient’s affected area by simply improving the CT scan of the relevant area before surgery. In addition, by eliminating the complicated step of instrument positioning during surgery, the preoperative selected model is directly replaced on the patient, allowing for precise fitting of the joint prosthesis, significantly shortening the surgery time and improving the accuracy of the surgery. In addition, 3D printing technology assisted total knee arthroplasty has fewer soft tissues to separate, no medullary cavity to open, less bleeding, less trauma, less risk of infection and fat embolism, and can be moved on the ground 3 days after surgery; 3D reconstruction of the patient’s lower limb force line before surgery to ensure the position of the prosthesis and good force line; finally, the diseased joint model is obtained before surgery to facilitate the preoperative formulation of the surgical plan, and to facilitate the preoperative communication and understanding with the patient. Finally, the preoperative joint model is obtained to facilitate the preoperative planning of the surgery and the preoperative communication and understanding with the patient. Professor Min Lu said: “With the continuous development of 3D printing technology, in the near future, every patient in need of joint replacement can be ‘tailor-made’ to print a ‘personalized’ artificial joint. “