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Snapping Thumb: Causes of Clicking, Popping, and Pain

Common Mechanisms

  1. Stenosing tenosynovitis (trigger thumb): A1 pulley thickening → tendon catching → painful click.
  2. De Quervain’s tenosynovitis: First dorsal compartment stenosis → radial wrist/thumb pain.
  3. Ligamentous laxity: Hypermobility → joint subluxation with click.
  4. Osteoarthritis (CMC joint): Crepitus, pain, bony enlargement.
  5. Bony prominence (radial styloid): Mechanical impingement.
  6. Repetitive strain: Texting, gaming, manual labor → tendinopathy.

Management

  • Activity modification, thumb spica splint.
  • NSAIDs, topical diclofenac.
  • Corticosteroid injection (trigger thumb, De Quervain’s).
  • Hand therapy: gliding exercises, strengthening.
  • Surgery (A1 release, trapeziectomy) if refractory.

Early intervention prevents chronic disability.

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