Your knee may keep popping, clicking, crunching, or grinding due to harmless causes, like air bubbles in or around your knee joints. Crepitus is the medical term for the popping sounds or sensations ...

Q. I am a 40-year-old active recreational athlete. I work out at the gym at least three days a week and play soccer on the weekends. About three months ago, I felt a pop in my left knee while playing.

A harmless form of knee clicking, medically known as crepitus, occurs due to tiny air bubbles trapped in the joint fluid. These bubbles release during movement, producing a popping or clicking sound ...

Q: My knee makes a popping sound sometimes — should I be concerned? A: Knee noises can be unsettling, but they're not always a cause for concern.