Trigger Finger (Stenosing Tenosynovitis)

Patient Summary

Is this FDA-cleared for this use?

Not FDA-cleared for trigger finger. FDA cleared medicinal leeches only for venous congestion in microsurgical reconstruction (K040187, 2004). Use here is investigational.

What evidence exists?

Tier C (investigational). One small case series describes symptomatic improvement; there are no randomized controlled trials. Evidence-based first-line therapy is observation with activity modification and splinting for mild cases, intra-tendon-sheath corticosteroid injection (highest non-surgical evidence; about 60 percent successful at 1 year), and percutaneous or open A1-pulley release for refractory cases. Hand-surgery outcomes are excellent and durable.

Main risks

• Bleeding from bite sites for 6 to 24 hours after detachment
• Bruising and tenderness over the palm for 5 to 10 days
• Local skin infection or, rarely, Aeromonas infection
• Allergic reaction to leech saliva (uncommon)
• Temporary worsening of finger triggering or pain for 1 to 3 days
• Damage to the digital neurovascular bundle if placement is improperly midline
• Small permanent scars at bite sites on a visible hand surface
• Delay or replacement of an effective corticosteroid injection or A1-pulley release

Who should not consider this

• Patients with locked finger requiring urgent release
• Patients within 4 weeks of a local corticosteroid injection
• Patients with active palm infection or paronychia
• Patients with diabetes-related tenosynovitis affecting multiple digits (consider systemic management)
• Patients on anticoagulants, with hemophilia, or with severe anemia
• Patients who have not tried evidence-based corticosteroid injection

What to ask your clinician

• Has my trigger finger been confirmed (A1 pulley stenosing tenosynovitis)?
• Have I tried splinting and at least one intra-tendon-sheath corticosteroid injection?
• If injection fails, am I a candidate for percutaneous or open A1-pulley release?
• Do I have diabetes (which worsens response to injection)?
• What evidence supports leech therapy specifically for trigger finger?
• Where exactly will leeches be placed — clearly off the digital neurovascular bundle?
• What is the practitioner's experience and Aeromonas-prevention plan?

When to seek urgent care

• A finger locked in flexion that you cannot release
• Sudden severe finger pain, swelling, or inability to move
• Spreading redness, warmth, pus, or red streaks on the hand (cellulitis or flexor tenosynovitis is a surgical emergency)
• Bleeding from a bite site lasting more than 24 to 48 hours
• Fever above 38.0 C / 100.4 F or chills
• Numbness or coldness in the finger
• Hives, throat tightness, or breathing difficulty