Re: knee pain
I'm sorry to hear that. The best way to find the cause of the pain is to have an x-ray and a physical exam by an orthopedic doctor who is experienced with knees. An MRI may also be necessary, but sometimes the exam is more useful.
In the meanwhile, ice, heat, and medicines such as Ibuprofen may help with the pain. So could wearing an ace bandage. It's possible that exercises could strengthen your leg to prevent the pain from coming back.