Knee replacement (95% of TKA patients undergo navigated surgery, which is more precise, faster and more efficient. Only a few apply traditional surgery) preoperative template is the same as total hip replacement, the template has been prepared before the operation. The balance of soft tissues is emphasized, extensive loosening is not advocated, and synovial tissues are not resected too much if not necessary. If there is any doubt about the instability of the prosthesis, Semi-Constrained prothesis prosthesis is applied as soon as possible. All minimally invasive surgeries of the spine, such as vertebroplasty, PKP, and minimally invasive implantation of pedicle nail systems are performed under 3D C-arm fluoroscopy, and all personnel, including nurses, are waiting in the room during fluoroscopy, which is different from that in China. Minimally invasive implantation of pedicle root nail rod system under 3D C-arm surveillance Application of VSD for skin defects During the three months of coexistence, I became good friends with many people in the operating room, Sabina is an old comrade who has been working in the operating room for twenty-five years and has always been doing orthopedic handwashing nurses. This old nurse has a good sense of humor and quick movements, and is very willing to work with clinicians. Before the professor and OBERAZRT go on stage, they all have to ask who is partnering with them today, and if it is her, the mood will be very good because the operation will go much smoother with her there. From this thought, many of our domestic nurses, to the age of old age, often face the dilemma of nowhere to go, in the operating room of the Klinikum Ingolstadt, the old nurse is a treasure. When I left, I gave her a hardcover commemorative atlas of the Shanghai World Expo.