If you are still stiff after walking for half a year after knee replacement, you can relieve it through local massage, surgical loosening, revision surgery and so on. 1. Local massage: gentle massage can be performed on the knee joint area to promote local blood circulation, which is conducive to improving the state of stiffness. 2. Surgical release: if you are still stiff after half a year of knee replacement, rehabilitation training and manual release may not solve the problem. If the position of the prosthesis is normal, the force line is normal, the size is suitable, the stability is good, and the infection is excluded, surgical release is feasible. 3. Revision surgery: If the effect of surgical release is not good, and there are cases of abnormal position of the prosthesis, loosening, inappropriate size, inappropriate thickness of the spacer, abnormal joint plane, joint instability, etc., then revision surgery can be performed. During revision surgery, the proliferating fibrous tissue is completely removed and combined with quadriceps tendonoplasty to improve range of motion and relieve stiffness.