http://www.bbc.co.uk/learningenglish/english/features/6-minute-english/ep-150903
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Joint cracking not harmfulPainless cracking of joints is as a rule not harmful. However, common sense generally would suggest that the intentional and repetitive cracking of one's joints is not only potentially socially bothersome, but also could be physically troublesome when it produces pain.
Knuckle cracking has not been shown to be harmful or beneficial. More specifically, knuckle cracking has not been shown as a cause of arthritis.
The latest Canadian study has left the door open to further research to investigate more fully what happens in the joint after the 'pop' as well as any positive or negative health implications of joint cracking.
If cracking is accompanied by pain, there could be underlying abnormalities of the structures of the joint, such as loose cartilage or injured ligaments. Some patients with arthritis (inflammation of joints, usually painful), bursitis or tendinitis notice cracking sounds, or crepitus, with joint movements, due to the snapping of irregular, swollen tissues.
http://www.webmd.boots.com/osteoarthritis/guide/joint-cracking-osteoarthritis
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