I think the most common cause of crackling sound is chondromalacia patallae and weak quadriceps which can be treated completely with strengthening of your quadriceps muscles
Dear One, developing pain after running could be a sign of osteochondritis, where your knee cartiledge becomes soft and gets damaged, stop running and do strengthening exercises, if that doesnt help consult a orhto and get examined.
I experience pain and cracking sound when i climb stairs or do activities that involve my knees
Right kne
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