Trigger finger is a stenosing tenosynovitis of the digital flexor tendons at the level of the first annular (A1) pulley, resulting in catching, snapping, or locked finger flexion.
Mechanisms of Tendon Entrapment
Digital flexor tendons traverse restrictive annular fibro-osseous pulleys. Chronic repetitive gripping triggers inflammatory hypertrophy and nodule formation at the A1 pulley interface, obstructing gliding excursion.
Clinical Signs
- Painful snapping or clicking sensation during digit extension
- Nocturnal or morning locking requiring manual assistance to straighten
- Tender palpable nodule over the flexor tendon sheath at the palmar crease
- Complete mechanical locking in chronic presentations
Frequently Asked Questions
What does trigger finger release involve?
Under local anesthesia, the restrictive A1 pulley is surgically divided via a minor 1-cm incision. The procedure takes under ten minutes with immediate restoration of smooth gliding.
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