Trigger Finger / De Quervain's Release | Trigger finger release

The A1 pulley is the first tight band at the knuckle joint; when it narrows, the thickened flexor tendon catches and the finger locks or clicks. This is the standard release for typical trigger finger, while the surgeon checks that the whole A1 pulley is divided under direct vision. Releasing it lets the tendon glide freely. If triggering persists after complete A1 release, a nearby proximal band sometimes called the A0 pulley may also need release, or one slip of the superficial flexor tendon may be removed. The A2 pulley should not be released because that can cause tendon bowstringing. In rheumatoid arthritis, simple A1 release is not recommended; synovectomy and nodule removal are preferred.

In open release, the surgeon protects nerves and vessels, divides the A1 pulley with a scalpel, then asks you to move the finger to confirm release; if triggering persists, one slip of the flexor digitorum superficialis tendon may be removed. Percutaneous release is done through the skin with a needle, and release is confirmed by active finger movement. A comparative study of 107 patients with 126 trigger thumbs found good outcomes with both; percutaneous release had better early pain and satisfaction, while open release had better outcomes at two years: 19% versus 7% pain and 9% versus 3% recurrence. Percutaneous release can irritate the tendon sheath; cadaveric studies report frequent superficial tendon scoring, though this may not cause long-term problems.

The thumb’s radial digital nerve crosses obliquely over the A1 pulley and may be vulnerable when the pulley is divided proximally, so surgeons avoid it by careful blunt dissection, identifying and preserving the neurovascular bundle, and hyperextending the metacarpophalangeal joint to reduce risk. Complete release is confirmed under direct vision. In open surgery, the nerve is not routinely isolated, yet it is protected by careful tissue handling. Percutaneous release carries a reported nerve-injury risk because digital nerves lie close to the A1 pulley; distal knife insertion and keeping the blade on the pulley surface may help, but care is needed.

Trigger finger occurs when an enlarged flexor tendon catches in a narrowed A1 pulley near the base of the finger. Releasing that pulley removes the mechanical block. In an awake patient, active motion can confirm that triggering has stopped before closure; if motion still catches, the surgeon can look for an additional proximal band or tendon slip. This helps avoid an incomplete release and gives immediate reassurance for both patient and surgeon. This immediate check is useful because triggering usually resolves right after release. If awake, the patient is instructed to take the finger through several cycles of active motion to ensure a complete release. Rheumatoid arthritis or tendon nodules may need different treatment, so suitability should be discussed individually.

Trigger finger is a mechanical impingement of often-enlarged flexor tendons passing through a stenotic A1 pulley near the MCP joint. Releasing that pulley removes the obstruction. A joint contracture is different: it reflects stiffness that developed before surgery, and this release is not designed to lengthen or remodel a stiff joint. If stiffness remains, passive stretching may be recommended. Rehabilitation is usually unnecessary unless a preoperative PIP contracture exists, and your surgeon may assess whether additional therapy is needed. Significant preoperative PIP flexion contractures often do not regain full motion despite surgical release and postoperative therapy, so expectations should be discussed with your surgeon.

In children, trigger thumb usually appears between 1 and 4 years and may affect both thumbs. If the thumb has been locked for 3–6 months, surgical release is commonly indicated; children under 3 may be observed. Surgery releases the A1 pulley for reliable results, and in experienced hands with pediatric anesthesiologists, results are usually excellent with very rare recurrence. Splinting is often poorly tolerated, so surgery is common. Adults more often have mechanical tendon catching, sometimes linked to diabetes or rheumatoid arthritis; steroid injections may help first, and release is considered after failed injections or fixed contracture. Adult release also addresses the A1 pulley, but the radial digital nerve is especially vulnerable.

The A1 pulley is released so the enlarged flexor tendon can glide freely. If release is incomplete, the tendon can still catch. In children, abnormal tendon relationships, nodules, or tight second or third pulleys may cause persistent triggering even after A1 release. In rheumatoid arthritis, tenosynovitis or intratendinous nodules may require synovectomy rather than simple release. Tendon adhesions can also leave residual triggering or a flexed thumb. Persistent triggering is rare, but incomplete release remains the usual explanation; careful intraoperative motion checks help confirm complete release. A diligent search for alternative causes is needed when A1 release does not resolve triggering, especially with multiple digit involvement or inflammatory conditions.

Pulleys keep flexor tendons close to the bones, maintaining flexion power and providing a gliding surface. If a pulley is disrupted or absent, the tendon can bowstring palmarward away from the joint’s axis of rotation. That increases the moment arm, so the same muscle contraction produces less flexion and requires more tendon excursion. The effect is more clinically relevant when major pulleys are completely divided. Releasing the sheath beyond the main pulley may also lead to bowstringing. Significant pulley loss can raise pressure at remaining pulley-tendon interfaces, increasing resistance and risking further problems during rehabilitation. This is why surgeons avoid releasing more than the intended pulley.