Habitual joint cracking and radiological damage.

@article{Watson1989HabitualJC,
  title={Habitual joint cracking and radiological damage.},
  author={Peter Watson and Alex Hamilton and R. A. B. Mollan},
  journal={British Medical Journal},
  year={1989},
  volume={299},
  pages={1566 - 1566}
}
A 25 year old Malaysian man who habitually elicited cracking sounds from many of his joints was investigated during a study of joint cracking. He had no symptoms or obvious abnormalities of his joints, but a radiograph of his right hand showed ligamentous ossification on the ulnar side of his third metacarpophalangeal joint and chondrocalcinosis in the first and fourth metacarpophalangeal joints (figure). There was no evidence of osteoarthrosis. Distraction of the articular surfaces during… 
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References

The consequences of habitual knuckle cracking.
TLDR
A survey of a geriatric patient population with a history of knuckle cracking failed to show a correlation betweenknuckle cracking and degenerative changes of the metacarpal phalangeal joints.