Research finds no link between knuckle cracking and osteoarthritis

Scientific research has addressed the long-standing debate regarding whether cracking one's knuckles leads to osteoarthritis. Studies involving the health data and hand X-rays of 215 individuals between the ages of 50 and 89 found no significant link between regular knuckle cracking and the development of joint calcification or osteoarthritis.

Advanced MRI imaging revealed that the characteristic sound produced during knuckle cracking is not caused by bones rubbing together. Instead, the sound results from the formation and bursting of microscopic gas bubbles within the synovial fluid. When a finger is stretched quickly, the pressure within the joint changes, creating a temporary gas cavity in the lubricating fluid.

Further reviews of observational studies, including a 2018 compilation, confirm that voluntary and painless knuckle cracking does not damage joint cartilage or hand function.