Hello, sound like this is usually due to the soft tissue around the newly installed prosthesis is still lax, muscle weakness, lack of sufficient strength to maintain the balance. These noises occur during the movement of the prosthesis after operation, especially when there is a collision between the patella and the femoral condyle prosthesis. This noise is rarely accompanied by clinical symptoms. Over time, after soft tissue self-repairing and balancing, these patients'joint activity "cackle" sound will gradually decrease or disappear, and no special treatment is required. Even if it does not disappear, if it does not cause pain or other symptoms, the patient should not worry too much. Consult your doctor when symptoms are obvious or significant or you feel pain.