See an Orthopedist: Swelling and hyperextension could indicate a ligament tear, most likely the acl. You could have also torn cartilage (meniscus) which could also cause your symptoms. See an orthopedic surgeon who can examine the knee and determine if you need x-ray, MRI or are ok to treat conservatively (rest, compression, ice, therapy). Many orthopedic offices have a same day clinic for acute injuries.
Answered 6/10/2014
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