Those pops and clicks you hear coming from your knees may be the sound of arthritis beginning to take hold. In a new study, people aged between 45 to 79, who experienced frequent joint noises, called crepitus, were more likely to develop knee osteoarthritis symptoms within a year. The researchers suggest that frequent complaints of knee grating, cracking, or popping might warrant an X-ray even if there’s no pain. However, it’s also normal to hear occasional knee joint sounds that aren’t signs of arthritis. Activities like cycling or swimming can strengthen the muscles around the knee to help stabilize the joint.