Cavitation is just the release of air in a joint. If there's a grating sound to it instead of a pop I would be a little more concerned. From what I understand the only possible problem is repeated frequent cavitation over a long period of time can cause the body to build up a little extra calcium between the join causing a little more friction. It would take a lot of popping for that to happen as far as I know.
My knee has been popping a lot lately but it's always followed by pretty intense pain. You didn't mention much if any pain so I wouldn't be very worried.
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