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Hello, this is Dr. David. I am reviewing your question now and will be with you momentarily.
I am sorry you injured your knee
it sounds like you have a bad knee sprain
which could have led to tendonitis or torn tendons or pulled or strained hamstring muscles.
you should ice the area behind your knee with a bag of ice wrapped in a towel
you can try heating pads as well
you should see a doctor as soon as you can to assess your knee and get an examination.
you may benefit from physical therapy for your leg after your knee gets better to help improve your leg and knee strength