Following knee replacement surgery, localized pain in the knee area due to the surgical procedure is an expected occurrence. However, problems directly related to the knee prosthesis generally do not cause widespread pain throughout the entire leg. It should not be forgotten that different issues, such as lower back or hip joint problems, can lead to leg pain. If new or unusual knee pain emerges a long time after knee replacement surgery, it is important to consult your doctor regarding the condition of the prosthesis. Issues such as wear, loosening, or infection of the prosthesis can be the cause of such pain.