The common complications after knee replacement are mainly the following: 1. Infection, the incidence of which has decreased year by year in recent years and has been less than 1%, is usually not the main cause of surgical failure, but early or secondary infection is one of the most important and dangerous complications. In addition, there are incisional problems. The probability of incisional problems after knee arthroplasty is 4%-18%, mainly manifested by poor incisional healing, subcutaneous fat liquefaction, oozing, skin edge necrosis, and skin flap necrosis.2 Deep vein thrombosis and pulmonary embolism, which are relatively serious, especially pulmonary embolism, may be life-threatening.3 Patellofemoral complications, which commonly include patellar dislocation as well as subluxation, patellar popping, patellar fracture, etc.4 Polyethylene component wear, prosthetic loosening, and joint instability. Periprosthetic fractures may also occur, mainly above the femoral condyle, with an incidence of 0.3%-2.0% after knee arthroplasty. If an intraoperative femoral condyle osteotomy notch occurs, a stemmed femoral prosthesis may be used and fractures can usually be avoided.