If the snap, crackle, and pop coincide with pain, swelling, joint instability, something moving around inside the knee or the knees locking out, it could be a sign of something more serious. Folks ...

If your knees crack without any pain, it's probably nothing to worry about. However, if there's persistent pain, it's a good idea to see a specialist.

buckling knee, popping knee, and many, many others. However, the underlying cause of an unstable knee can lead to the real solution, and determining the underlying cause can be tricky as well.