<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hello Doctor, I have been experiencing pain in my knee for quite some time now. It hurts whenever I bend my knee or stand for long periods of time.  <response>: Hello, Im sorry youre experiencing that discomfort. Based on your symptoms, its possible that you may have chondromalacia of the patella. To confirm the diagnosis, well need to run some medical tests.The required medical tests for your condition include a radiographic imaging procedure, a plain x-ray, physical therapy exercises, magnetic resonance imaging MRI, and examination of your foot. Depending on the severity of your condition, we may also recommend other therapeutic procedures or excision. 