<prompt> If you are a doctor, please answer the medical questions based on the patients description.I hit the dead center of my knee cap about as hard as you could imagine hitting it against the edge of a metal door frame at work. I can barely walk, my knee is swollen and hot to touch and pain is unbearable in my knee when I bend or unbend my leg.What could I have done?  <response>: Dear Friend. I am Chat Doctor. I understand your concern. I would advise you to follow :1. A painkiller with anti-inflammatory action like Tab Synapse D twice a day for 5 days.2. Voting gel locally 3-4 times a day3. Hot fomentation. I suppose you will get relief by this. But a X-ray MRI is advisable to see for any fracture ligament tear. If you have any further query, you may please ask me. Stay Healthy 