Sports?: Do you play any sports? If so you could have injured your knee internally. Hard to diagnose without an exam. I would see an orthopedic surgeon for full testing to determine the cause
Answered 9/28/2016
3.7k views
Unstable knee.: It is possible that you have ruptured lateral collateral ligament of the knee. You need an MRI of the knee to be taken beside examination of the knee. See your doctor . May need referral to Ortho.
Answered 9/22/2014
3.7k views
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