I recently had a colonoscopy and endoscopy done and the day after the procedure I started feeling a sharp pain in the back of my knee in the bend of my leg. Per the nurse it is highly unlikely that they could have hit a nerve during the procedures but I had no prior pain or leg issues. This pain feels like a pinched nerve and it is causing both of my legs, ankles and feet to swell. I had an ultra sound done yesterday to see if I have any blood clots but I am waiting on the results. I am having difficulty walking at times and have to use crutches. What could this be?