<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, Ive been having swelling and pain in my knee joint for the past few days. Its difficult for me to bend or straighten my leg.  <response>: Based on your symptoms, its possible that you have joint effusion. To confirm this, we need to perform a radiographic imaging procedure. This may involve a plain X-ray or an MRI, depending on the severity of your condition. We may also recommend physical therapy exercises or the application of a splint to relieve your symptoms. Additionally, we may need to examine your foot and recommend other non-OR therapeutic procedures on your musculoskeletal system. 