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Does cracking knuckles cause arthritis?

BUSTED
0 RCTs in PubMed PubMed results Last checked May 2026
Multiple studies show no link between knuckle cracking and arthritis development.
Several observational studies and case reports have consistently found no association between habitual knuckle cracking and the development of arthritis. The popping sound comes from gas bubbles collapsing in synovial fluid, which appears to be harmless to joint health. Long-term studies of chronic knuckle crackers show similar rates of arthritis compared to non-crackers.
Overall confidence
85%
RCT quality
40%
Expert consensus
90%
RCTs found
0 RCTs in PubMed
Largest trial
300 participants (observational)
Date range
1975–2011
Effect size
none
Key studies
Castellanos & Axelrod study · 1990
No difference in arthritis rates between habitual knuckle crackers and controls
Unger self-experiment · 1998
50-year personal study cracking one hand showed no arthritis difference
DeWeber radiographic study · 2011
No association between knuckle cracking and hand osteoarthritis on X-rays
Caveats
Most evidence comes from observational studies rather than randomized trials, and some studies suggest possible minor effects on grip strength or hand swelling

People also ask

What causes the popping sound when cracking knuckles?
Gas bubbles collapsing in the synovial fluid between joints
Can knuckle cracking cause any harm at all?
Some studies suggest possible minor grip strength reduction but no serious harm
How long have scientists studied this question?
Research on this topic spans over 40 years with consistent findings
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BustMyMyth synthesizes published RCT evidence. It is not medical advice. Always consult a qualified healthcare professional. Sources: PubMed/MEDLINE, Cochrane Library, ClinicalTrials.gov.