Many reasons: If the knee swells and you are unable to bear weight then you should see a doctor that can evaluate you like a sports medicine or orthopedist. The list if possible injuries or reasons is long.
Answered 4/24/2015
4.3k views
Several: Twisting, effusive, type will present this way. Any injury causing supportive ligamental disruption will do it.
Answered 3/30/2014
4.3k views
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