Overview
Each finger has a set of flexor tendons that run from the forearm through the palm and into the fingertip. These tendons pull the finger closed. To stay close to the bone, they pass through a series of small tunnels called pulleys. The A1 pulley sits at the base of the finger, right at the knuckle. It is the most common spot for narrowing. When the pulley thickens, or when the tendon grows a small lump (nodule), the tendon can no longer glide smoothly through the tunnel.
The result is trigger finger (stenosing tenosynovitis). You feel catching or locking as you bend the finger. When the tendon finally pushes through the tight spot, the finger snaps open or closed with a painful click. In worse cases the finger can lock in a bent position and need the other hand to straighten it. The thumb, middle, and ring fingers are affected most often, though any finger can develop the problem.
Most cases are treated first without surgery, using a corticosteroid injection into the tendon sheath. A single injection gives lasting relief in roughly half of patients. The effect can wear off over time, though, especially in people with diabetes or when the tendon lump is large. When symptoms persist after one or two injections, or when the finger is locked, surgical release is the reliable, lasting fix.
Trigger finger release is a short outpatient procedure. The surgeon divides the A1 pulley, opening the tunnel so the tendon can glide freely again. The finger is typically moving the same day. Most patients recover full grip strength and range of motion within a few weeks, with few long-term limits.
How the Procedure Works
We make a small incision at the base of the finger and open the A1 pulley along its full length. You are awake under local anesthesia, so we can test the release right away. We ask you to bend and straighten the finger. Free glide without catching confirms a complete release.
We preserve the A2 pulley just past it and all the other pulleys. The A2 does the most to keep the tendon close to the bone. Cutting it would let the tendon bowstring (bow away from the bone like a lifted guitar string), trading one problem for another. For the thumb, the pulley sits a little higher and the sensory nerves run closer to the incision, so we keep the cut exactly in the midline.
When to Consider Trigger Finger Release
Trigger finger release is offered when symptoms, imaging, and a trial of non-surgical care together point to surgery as the next step. The typical picture includes:
Symptomatic triggering
Catching or locking of the finger not relieved by activity changes, splinting, or steroid injection.
Locked finger
A finger stuck bent that you cannot straighten on your own.
Recurrent triggering
Symptoms return after a prior injection. That is a signal the underlying problem needs direct treatment.
Treats: Trigger Finger
Risks & Why We Still Recommend It
Every operation carries risk. This procedure is offered because the condition, when left untreated, can cause worsening locking, pain with every grip, and in time a finger that will not straighten without help from the other hand. The decision to proceed weighs the risks of surgery against the limitations the condition places on daily function. Surgery does not remove risk; it addresses a problem that is otherwise progressive. Whether it is appropriate is determined for each patient in consultation with the surgeon.
The risks we discuss with you before trigger finger release include:
- bleeding and infection
- anesthesia risk (typically local)
- scar tenderness
- digital nerve injury (rare)
- bowstringing if too much pulley is released (the tendon lifts off the bone and loses mechanical efficiency)
- incomplete release requiring revision
The indication to proceed is a symptomatic trigger finger that has not responded to a course of injection and activity modification. If this operation is not right for you, we will not recommend it.
Frequently Asked
questions we hear in clinicWill I be asleep during the surgery?
No. You are awake under local anesthesia, so we can test the release right away: we ask you to bend and straighten the finger, and free glide without catching confirms a complete release.
Why not just get another cortisone shot?
Injections relieve symptoms in about half to two-thirds of patients, but the effect can wear off over time, especially in people with diabetes or when the tendon lump is large. When symptoms persist after one or two injections, or when the finger is locked, surgical release is the reliable, lasting fix.
How soon will my finger move again?
The finger is typically moving the same day. Most patients recover full grip strength and range of motion within a few weeks, with few long-term limits.
What causes the catching in the first place?
The tendons that close your finger pass through small tunnels called pulleys. When the A1 pulley at the base of the finger thickens, or the tendon grows a small lump, the tendon can no longer glide smoothly, and the finger snaps open or closed as the tendon pushes through the tight spot.
Will cutting the pulley weaken my hand?
Only the A1 pulley is divided. The A2 pulley just past it, which does the most to keep the tendon close to the bone, is preserved along with all the others. Cutting it would let the tendon bowstring, trading one problem for another.
What are the risks?
Bleeding and infection, scar tenderness, rare digital nerve injury, bowstringing if too much pulley is released, and incomplete release requiring revision. The full picture is in the Risks section above.
Further Reading
External patient-education references and related OSI pages for additional background:
