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Effect of habitual knuckle cracking on hand function.

J Castellanos1, D Axelrod

  • 1Department of Internal Medicine, Mount Carmel Mercy Hospital, Detroit, Michigan 48235.

Annals of the Rheumatic Diseases
|May 1, 1990
PubMed
Summary
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Habitual knuckle cracking may not cause arthritis but can lead to hand swelling and reduced grip strength. This study suggests a link between knuckle cracking and functional hand impairment in adults.

Area of Science:

  • Orthopedics
  • Rheumatology
  • Occupational Health

Background:

  • The link between habitual knuckle cracking and hand osteoarthrosis has been debated, often dismissed as anecdotal.
  • Mechanical forces from knuckle cracking may involve rapid energy release, similar to destructive forces on mechanical components.

Purpose of the Study:

  • To investigate the association between habitual knuckle cracking and hand function in individuals aged 45 and older.
  • To determine if knuckle cracking correlates with hand arthritis, swelling, or reduced grip strength.

Main Methods:

  • A cross-sectional study evaluated 300 patients (aged 45+) without significant systemic diseases.
  • Participants were assessed for habitual knuckle cracking, hand arthritis, swelling, and grip strength.
  • Demographic and lifestyle factors (manual labor, nail biting, smoking, alcohol) were recorded.

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Main Results:

  • No increased prevalence of hand arthritis was found in habitual knuckle crackers (74 individuals) compared to non-knuckle crackers (226 individuals).
  • Habitual knuckle crackers showed a higher likelihood of experiencing hand swelling and diminished grip strength.
  • Knuckle cracking was associated with manual labor, nail biting, smoking, and alcohol consumption.

Conclusions:

  • Habitual knuckle cracking does not appear to increase the risk of hand arthritis.
  • The practice is linked to functional hand impairment, specifically hand swelling and reduced grip strength.
  • Further research may explore the precise biomechanical mechanisms underlying these functional deficits.