See a doctor: Popping can be caused by many things. Some people are just prone to popping and it is normal for them. A torn cartilage can cause popping. If a knee injury is not completely healed and the knee remains a little swollen, the extra fluid will cause it to pop with range of motion, just like a finger joint. If it is painless i would ignore it. If it hurts you should have it checked out.
Answered 2/16/2015
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