If the knee clicks and there is pain after distal femur tumor prosthesis surgery, it is usually necessary to consider local calcium deficiency or joint dislocation, which needs to be relieved by timely calcium supplementation or repositioning surgery. 1. Calcium supplementation: Most of the people who have undergone bone surgery will have different degrees of calcium deficiency or poor bone healing after surgery. If there are clicking sounds or localized pain in the joints, osteoporosis or bone fragility caused by calcium deficiency in the joints can be considered. It is recommended to take more calcium in the daily diet, which can be supplemented by drinking milk and calcium supplements, which can effectively promote bone health. 2. Repositioning treatment: Because the tumor prosthesis of distal femur is usually placed by replacing the prosthesis to ensure the normal operation and appearance of local joints and bones. Therefore, if the replacement prosthesis is not fixed securely or the movement is not proper, the joint may be dislocated or subluxated, which will cause the knee to make noise or produce pain. For this kind of discomfort, it is necessary to go to the hospital for repositioning treatment in order to maintain the stability of the joint. If your knee is rattling or painful after distal femur tumor prosthesis surgery, it is recommended to go to the hospital for X-ray examination, and choose the appropriate treatment plan according to the doctor’s advice for relief.