This claim states that cracking your knuckles does not give you arthritis. It is sourced by an article written by the John Hopkins Arthritis Center. (https://www.hopkinsarthritis.org/arthritis-news/knuckle-cracking-q-a-from/)
Upon investigation this article is a little bit dated, having been written in 2007. Despite this. the arthritis center, which was founded in 1998, is ranked number 1 in Rheumatology, according to the US News and World Reports 2024-25 Best Hospital Lists. This means that their doctors are highly regarded experts in the field and they have cutting edge research at their disposal. The article is credited to Dimitrios Pappas a MD, MPH Rheumatologist, expertise in arthritis, and Greece Adjunct Assistant Professor of Medicine. He explains that when you stretch the capsule it lowers the pressure inside the joint, creating a vacuum which is filled with gas that has just been dissolved in synovial fluid. Thus creating a bubble which bursts. He says that there is no evidence that can prove that this causes arthritis and studies have come back the same, whether the subject cracked their knuckles or not. However, he does mention that there are other side effects, such as injury to the surrounding ligaments, and eventual reduced grip strength.
This conclusion is reinforced by an article on Loyola Medicine’s website, (6 Facts and Myths About Cracking Your Joints | Blog | Loyola Medicine) written in 2024 by Alexander Soneru, a MD, and orthopedic hand surgeon at Loyola Medicine. He states that joint cracking has been studied since the mid 1900’s and it is normal, unless it is causing pain. Soneru confirms that arthritis caused by cracking knuckles is a myth, saying there is no scientific evidence to back it up. He warns about other side effects, and advises to talk to your doctor is pain is accruing but trees with the article from the original 2007 claim.