I am being treated by a podiatrist for ankle pain he sent me to physical therapy said I had tendonititis and shortly after I started to have severe pain in my knee. The Dr. doesn't believe it's related to my ankle. Put the pain below my knee is severe, and burning pain that runs down my leg to my ankle and arch of my foot. I have to use crutches to get around. I am female 59 years old. Any ideas what is going on?