It is used in the operation room for knee arthroscopy surgery. The knee joint is an important weight-bearing joint of the lower extremity, and its structure and function are the most complicated in human joints. Knee degenerative osteoarthrosis is a common disease in the elderly. It is reported that the incidence of knee osteoarthrosis in patients over 50 years old is 35%, and that in women is as high as 74%. More and more patients with severe knee osteoarthrosis require manual knee replacement. Knee replacement can relieve knee pain, improve knee function, correct knee deformity and achieve long-term stability.