MortazaviSMetal, HossainFetal and other scholars have analyzed the three main causes of knee revision. The most common cause remains infection. The other two causes are loosening of the tibial/femoral prosthesis and polyethylene wear. Methods to enhance prosthesis fixation Standard revision prostheses rely on Zone 1 (epiphyseal zone) and Zone 3 (diaphyseal zone) fixation. Cement stems and bioprostheses are usually fixed by Zone 3. Zone 2 (epiphysis) is not generally used for fixation of most prostheses. However, Zone 3 fixation can be enhanced if Zone 2 bone is in good condition. Bone defects can be reconstructed using knee cuffs and tapered patches. However, the principles of these two applications are different: the knee cuff is part of the prosthesis, allowing Zone 2 fixation, and later bone ingrowth will enhance prosthetic fixation; the knee tapered patch is a component independent of the prosthesis, used to fill the bone defect, and does not solve the problem of long-term loosening of the prosthesis. Ways to reduce polyethylene wear Many reports of increased polyethylene liner wear with increasing prosthetic restrictiveness have been reported in the literature. Pure hinged knees are the most restrictive, and given the wear issues most hinged knees on the market are rotating hinged knees. scholars such as WyldeV found only 2-4 degrees of femoral-tibial rotation in fixed platforms such as the VVC, and a study by DennisDA et al. found that the relative femoral-tibial rotation during knee flexion should be between 5-15 degrees. Therefore, only a movable platform knee can help patients to obtain a physiological knee rotation angle. The correct rotational alignment of the femoral/tibial prosthesis for knee prosthesis implantation, which is often difficult to achieve, further increases the undesirable rotational stresses in the polyethylene spacer. The undesirable stresses are transmitted to the prosthesis-bone cement interface and the prosthesis-bone interface and may contribute to early loosening of the prosthesis. Theoretically, the movable platform knee has a lower platform wear rate and better long-term results, and the results of a study by AgarwalS et al. showed definite medium-term results for the movable platform knee. However, the long-term results need to be supported by more literature.