Trigger finger is a mechanical stenosing disorder of the flexor tendon–pulley system. The flexor tendon must glide through a pulley near the base of the finger, and when that relationship becomes thickened or restricted, the tendon can catch, click or lock during finger motion.
But not every painful finger is trigger finger. Flexor tendon pain, joint arthritis, Dupuytren contracture, traumatic tendon injury and other hand disorders can produce pain or stiffness without true stenosing triggering.
At our Denver Tech Center clinic, Dr. Scott King first determines whether the patient’s familiar symptoms are being produced at the A1 pulley and whether there is actual catching or locking. The examination assesses tendon glide, palpable triggering, active and passive motion, joint mobility, contracture, tendon continuity and whether ultrasound or hand-specialist referral is appropriate.
Treatment may include load modification, movement and tendon-gliding rehabilitation, splinting where appropriate, manual treatment for selected surrounding restrictions, shockwave therapy in selected cases, or referral for injection or surgical evaluation when the severity and diagnosis warrant it. Novo Soft Tissue sees patients from across the Denver Tech Center and Centennial.
What Trigger Finger Is
Trigger finger, also called stenosing flexor tenosynovitis, involves the flexor tendon and the A1 pulley region. Trigger finger is better understood as a stenosing tendon–pulley disorder than as simple inflammation. Ultrasound studies show that both the A1 pulley and the flexor tendon are thicker in affected fingers than in healthy ones (Kamacı, 2026).
The same problem in the thumb is called trigger thumb. It is a different condition from thumb CMC arthritis, which affects the joint at the base of the thumb near the wrist rather than the flexor tendon at the thumb’s knuckle crease.
The A1 Pulley
The flexor tendons that bend the fingers run through a sheath held against the bones by a series of fibrous pulleys. The A1 pulley is the first of these, on the palm side of the hand over the metacarpal head, at the level of the knuckle where the finger meets the palm. Its job is to keep the flexor tendon close to the bone and joint axis so the finger bends efficiently.
The mechanical problem occurs when the flexor tendon no longer glides smoothly through the A1 pulley region. A thickened tendon segment may be felt as a small lump, but a palpable nodule is not required for the diagnosis. See trigger finger vs flexor tendon pain for how the anatomy shapes the exam.
Symptoms
- Pain or tenderness on the palm side of the hand at the base of the finger or thumb
- Clicking, catching or a jump as the finger bends or straightens
- Locking in a bent position, sometimes needing effort or the other hand to straighten it
- Stiffness that is often worse in the morning
- Pain during gripping
- A tender lump or a felt movement of the tendon under the skin in some cases
Seek prompt evaluation if you suddenly cannot bend a finger after an injury, have a cut on the palm side of the finger or hand, a finger that is stuck and cannot be straightened, a red, hot, swollen finger that hurts along its length or with fever, or numbness after trauma. A suspected tendon rupture, laceration or infection of the tendon sheath needs urgent hand care, not trigger-finger treatment.
Severity Matters
Treatment decisions should account for severity. A painful finger with intermittent catching is different from a finger that is repeatedly locked or developing fixed contracture.
Clinicians and researchers commonly grade trigger finger with the Quinnell classification or a modified version. In general terms, milder cases have pain or uneven movement, moderate cases catch, more advanced cases lock and need active effort or the other hand to straighten, and the most advanced cases cannot move normally at all. The sham-controlled shockwave trial enrolled patients with Quinnell grade II trigger finger, and a 2026 radial study enrolled grade II–III cases, so their results apply most directly to moderate disease.
Other Causes That Mimic Trigger Finger
- Flexor tendon pain without triggering: load-related pain along the tendon during gripping, with smooth glide and no catch.
- Finger joint arthritis or synovitis: pain and swelling at the MCP, PIP or DIP joint, often with stiffness that follows the joint rather than the tendon.
- Dupuytren contracture: palmar nodules and cords that gradually pull a finger into a bent position. It limits straightening rather than catching. See trigger finger vs Dupuytren contracture.
- Flexor tendon injury or rupture: sudden loss of active bending after trauma or a cut needs urgent hand-surgery evaluation.
- Nerve symptoms: numbness or tingling in the fingers points to a nerve, such as carpal tunnel syndrome, rather than to the tendon.
- Wrist tendon problems: palm-side or thumb-side wrist pain comes from a different tendon source. See wrist and forearm tendon pain.
What We Examine
- Exactly where the pain sits and what reproduces it
- Whether catching or locking can be felt or seen during active bending and straightening
- Tenderness and thickening over the A1 pulley
- Active and passive range of each finger joint, and whether a bent finger can be straightened passively
- Palmar nodules, cords and fixed contracture
- Tendon continuity, by checking that each joint can be actively bent
- Sensation and the wrist and forearm above
When the diagnosis is uncertain, ultrasound can evaluate both tendon and pulley anatomy, and dynamic ultrasound can show whether the tendon catches during movement.
How Treatment Is Selected
Load and Activity Modification
Temporarily reducing repeated forceful gripping and the tasks that trigger the finger, where appropriate, so the tendon is not driven through the pulley over and over while it is irritable.
Tendon-Gliding and Hand Movement
Controlled bending and straightening to restore comfortable tendon excursion, avoiding repeated forced triggering in the irritable stage and progressing back to normal hand use. There is no single fixed protocol.
Splinting
For selected cases. A 2026 systematic review of 13 studies found splinting effective for short-term relief, with orthoses that block the middle finger joint performing better than those that block the knuckle joint (McKenna, 2026). Adherence can be challenging, and splinting does not resolve every case.
Manual Soft-Tissue Treatment
An adjunct only. Manual treatment may help selected surrounding soft-tissue restrictions, but true stenosing triggering is a tendon-pulley disorder and should not be reduced to generic “tight tissue.” Manual Adhesion Release may address restricted forearm and hand tissue found on examination; it does not open the pulley.
Shockwave Therapy
Trigger finger has direct randomized and sham-controlled shockwave evidence, which makes it a reasonable noninvasive option for selected patients. Clinical studies demonstrate symptom and functional improvement; they do not show that shockwave mechanically divides the A1 pulley. See the shockwave evidence review and shockwave therapy in Denver.
Injection Referral
Corticosteroid injection remains a standard nonoperative treatment. A 2026 systematic review of 13 randomized trials noted that it is widely used, although there is limited consensus on the best agent, dose and technique (Kuper, 2026). We refer for injection when it is the better fit for the patient’s severity, goals or timeline.
Hand-Surgery Referral
For fixed locking, advanced contracture, persistent triggering, a major functional deficit, failed conservative care, or a suspected tendon rupture or structural injury. Surgical release remains a highly effective option for persistent or advanced trigger finger and should not be delayed indefinitely when mechanical locking is substantial.
You do not need to decide which treatment you need before your visit. All four tools are compared on the services page.
What the shockwave evidence shows
Against sham
60 patients
higher-energy wide-focused ESWT had lower pain and QuickDASH disability than sham at six months
PMID 34029555
Against injection
40 patients
ESWT and corticosteroid both improved, with no significant between-group difference
PMID 26763271
Findings are protocol-specific and apply most directly to moderate trigger finger.
What Research Says
- A tendon–pulley disorder: trigger finger is a mechanical problem of flexor-tendon gliding through a thickened A1 pulley, and ultrasound shows thickening of both the pulley and the tendon in affected fingers (Kamacı, 2026).
- Pain alone is not trigger finger: the defining feature is altered tendon excursion with catching or locking. Painful gripping with smooth glide points to tendon, joint or other causes.
- Shockwave vs injection: a 2016 randomized trial of 40 patients compared ESWT with corticosteroid injection. Both groups improved significantly in pain, triggering severity and function, with no significant between-group difference in cure rate, pain or function during six months of follow-up (Yildirim, 2016).
- Shockwave vs sham: a 2021 double-blind randomized trial of 60 patients with Quinnell grade II trigger finger compared higher-energy and lower-energy wide-focused ESWT with sham, each given as 1,500 impulses weekly for four weeks. All groups improved, but the higher-energy group had significantly lower pain and QuickDASH scores than sham at six months, with no adverse effects in either active group (Chen, 2021).
- Newer randomized evidence: a 2026 three-arm trial analyzed 116 patients receiving ESWT, high-intensity laser therapy (HILT) or home exercise. Both active treatments produced greater grip strength than exercise alone, and HILT had the best 12-week pain and QuickDASH results (Çetin Duru, 2026).
- Radial ESWT: a 2026 prospective study of 42 patients with moderate trigger finger found that both radial ESWT and corticosteroid injection improved, with faster early relief after injection and better six-month results after ESWT. Allocation was non-randomized, so this is supportive rather than definitive evidence (Suárez Cabañas, 2026).
- Across treatments: a 2026 network meta-analysis of 27 randomized trials found surgical release most effective overall, and steroid injection, NSAID injection and ESWT each more effective than placebo injection (Chiang, 2026).
- Pooled evidence: a 2026 meta-analysis of 12 randomized trials in stenosing tenosynovitis found a pooled pain benefit from ESWT, but functional results were less consistent and the trials mixed trigger finger with De Quervain tenosynovitis. It synthesizes overlapping primary trials and should not be treated as an independent second set of patients (Zhang, 2026).
- Severity: fixed locking, advanced contracture or persistent refractory triggering may need injection, percutaneous release or open surgery. Shockwave does not mechanically divide the pulley, and corticosteroid injection and surgical release remain established treatments.
This is why Novo treats trigger finger as a severity-dependent mechanical tendon-gliding disorder rather than simply a painful finger.
Trigger finger vs flexor tendon pain → · Trigger finger vs Dupuytren → · Shockwave evidence →
Sources: Chen et al., Arch Phys Med Rehabil 2021 · Yildirim et al., J Hand Surg Eur Vol 2016 · Çetin Duru et al., Rheumatol Int 2026 · Suárez Cabañas et al., Rev Esp Cir Ortop Traumatol 2026 · Chiang et al., Ann Phys Rehabil Med 2026 · Kamacı et al., J Clin Ultrasound 2026 · McKenna et al., J Hand Surg Glob Online 2026 · Kuper et al., J Plast Reconstr Aesthet Surg 2026 · Zhang et al., Front Physiol 2026
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