How is trigger finger (TF) staged?

Updated: Apr 26, 2021
  • Author: Satishchandra Kale, MD, MBBS, MBA, MCh(Orth), FRCS(Edin), FRCS(Tr&Orth); Chief Editor: Harris Gellman, MD  more...
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Green's classification of triggering is used only for clinical grading and documentation. No correlation has been established between the grading scheme and the outcome following injection therapy. The various grades are defined as follows [34] :

  • Grade I (pretriggering) - Pain; history of catching that is not demonstrable on clinical examination; tenderness over the A1 pulley
  • Grade II (active) - Demonstrable catching, but with the ability to actively extend the digit maintained
  • Grade III (passive) - Demonstrable locking in which passive extension is required (grade IIIA) or in which the patient is unable to actively flex (grade IIIB)
  • Grade IV (contracture) - Demonstrable catching, with a fixed flexion contracture of the proximal interphalangeal (PIP) joint

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