Be seen: I would be seen. An exam and appropriate studies will usually determine the cause. Ligamentous injuries, such as an injury to the ACL can cause an unstable knee. If you are having a lot of trouble with pain running down your leg, it could also be coming from your back. In severe cases pinched nerves in the back can cause weakness in the muscles around the knee making it less stable.
Answered 8/31/2015
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