Dislocated Knee Cap

I went to see the orthopedic doctor Monday and he said that I likely dislocated my knee cap for a second and then it went back in to place. He drained 60cc of blood from my knee and it pretty much got rid of teh swelling and now I am able to walk fairly normal. It still doesn't feel right. I have an MRI set for Saturday morning to really determine the damage. All I want to know is what do I need to do to get back to playing soccer and how long until I can. Typical guy I guess.