Osteoarthritis is also known as degenerative osteoarthropathy, i.e. osteophyte disease. It is common in the knee, hip, ankle and shoulder joints, with the knee joint being the most common. Its main pathological changes are degeneration and injury of the articular cartilage, resulting in villi-like hyperplasia, roughness and fragmentation of the cartilage, along with compensatory repair by the body, which may have increased vascularity, subchondral bone hyperplasia and local bone thinning. The main clinical manifestations are pain, limited activity, and dysfunction, which can be clearly diagnosed with the help of X-rays, MRI, and CT. Pre- and post-operative X-rays related to the artificial total knee surface replacement are shown below: 1. Pre-operative X-ray of the patient: the medial joint space was significantly narrowed and obvious osteophytes were visible. 2, After bilateral knee surface replacement in stage I of both knees, the metal prosthesis is well positioned, with normal force lines and normal looseness. 3, The last two are postoperative lateral radiographs of the knee joint.