01OverviewDefinition, clinical context and the essential points that orientate the chapter.
Trigger finger or thumb is stenosing flexor tenosynovitis at the A1 pulley. Ask whether the digit clicks, catches after sleep, locks in flexion or needs the other hand to release it. Identify pain over the palmar metacarpal head and occupational or recreational gripping, but avoid implying that work alone caused the disease. Record diabetes, inflammatory arthritis, thyroid disease, dialysis, previous injection and whether several digits are affected. Acute redness or fusiform swelling changes the problem to possible infection.
Observe the resting cascade and ask the patient to open and close slowly. Palpate the A1 pulley while feeling the flexor tendon glide. Reproduction of familiar catching and a tender nodule supports the diagnosis. Test isolated flexor digitorum superficialis and profundus function, active and passive joint extension and distal sensation. Grade severity pragmatically from pain without catching through demonstrable triggering to fixed lock. Do not force a swollen locked finger when the diagnosis is uncertain.
Dupuytren disease begins as a firm palmar nodule, then forms a longitudinal cord that draws a finger into flexion. Ask about family history, age at onset, bilateral disease, knuckle pads, plantar fibromatosis, previous procedures and speed of progression. The ring and little rays are common, but thumb and first web can be affected. Measure metacarpophalangeal and proximal interphalangeal contracture with the wrist neutral and perform the tabletop test. Distinguish fascial tethering from a painful tendon nodule that moves or clicks.
Neither typical disorder requires routine imaging or laboratory testing. Ultrasound is useful when a tendon-sheath ganglion, solid mass or uncertain pulley pathology is suspected. Radiographs answer trauma, arthritis or joint deformity questions. Blood tests should target a clinical concern such as newly recognised diabetes or inflammatory arthritis, not form an indiscriminate panel. A rapidly enlarging or atypically painful mass warrants tumour assessment rather than assumed Dupuytren disease.
Mild trigger symptoms may improve with reducing repetitive forceful grip, short analgesia and a splint that limits metacarpophalangeal flexion or holds the digit in relative extension at night. Preserve tendon glide and avoid prolonged whole-hand immobilisation. A corticosteroid injection placed into or around the flexor sheath at the A1 pulley can provide substantial relief, though success is lower with diabetes, longstanding fixed locking or multiple digits. Repeat treatment should be individualised rather than automatic.
Refer a persistently locked, recurrent or functionally limiting trigger digit for release. Percutaneous release can divide the pulley in selected anatomy, while open release provides direct visualisation and is preferred for some digits, recurrence or risk patterns. The pulley is released without cutting the flexor tendon or digital nerves. Encourage early movement according to the surgeon, watch the wound and expect temporary soreness; persistent locking suggests incomplete release, tendon pathology or an alternative diagnosis.
Dupuytren nodules without contracture do not need prophylactic surgery, splinting or stretching intended to prevent all progression. Observe and teach self-monitoring with the tabletop test. Functional contracture, loss of flat hand placement, increasing metacarpophalangeal angle or any consequential proximal interphalangeal deformity supports hand referral. Needle fasciotomy offers rapid recovery but more recurrence; limited fasciectomy is more invasive with longer rehabilitation but may provide more durable correction. Dermofasciectomy is reserved for selected recurrent or severe disease.
Treatment choice considers age, occupation, skin quality, exact joint, cord anatomy, recurrence risk and willingness to rehabilitate. Proximal interphalangeal contracture is harder to correct and more likely to retain stiffness, so referral should not wait until extreme deformity. In diabetes, explain lower trigger-injection response and transient glucose rise. Anticoagulation requires a planned injection or procedural strategy, never unsupervised cessation. Pregnancy-related trigger symptoms are managed conservatively when possible, with medicine and injection decisions individualised.
Key points
- Trigger finger causes painful clicking, catching or locking at the A1 pulley near the metacarpal head; a tender mobile tendon nodule may be felt during flexion and extension.
- Dupuytren disease causes a usually painless palmar nodule and cord with progressive metacarpophalangeal or proximal interphalangeal flexion contracture, commonly affecting ring and little fingers.
- The tabletop test is positive when the patient cannot place the hand and fingers flat; functional impact and measured joint contracture, not the nodule alone, guide referral.
- First-line investigation for typical trigger digit or Dupuytren disease is clinical examination; ultrasound or radiographs are reserved for an atypical mass, trauma or competing joint diagnosis.
- First-line mild trigger management includes activity adjustment, analgesia and sometimes night or relative-extension splinting; one corticosteroid injection into the flexor sheath region is an established next option.
- Persistent, recurrent or locked trigger digit and objective fixed contracture should be referred for percutaneous or open A1-pulley release discussion.
- Mild Dupuytren disease without functional contracture can be observed; refer when the hand no longer lies flat, daily activities are limited or proximal interphalangeal involvement progresses.
- Dupuytren procedures include needle fasciotomy and limited fasciectomy within specialist pathways; none cures the underlying diathesis, so recurrence and nerve, tendon, skin and stiffness risks require explicit discussion.
02AetiologyUnderlying causes, associations and risk factors, with why each one matters.
A1 pulley stenosis
Trigger digit commonly arises when flexor tendon thickening and pulley narrowing impair smooth glide at the metacarpal head, often without one identifiable injury.
Metabolic and inflammatory association
Diabetes, rheumatoid disease and some thyroid disorders increase trigger-digit risk, multiplicity and recurrence, while dialysis and other systemic factors may alter treatment response.
Palmar fibromatosis
Dupuytren disease reflects genetic and fibroproliferative susceptibility, especially with Northern European ancestry, male sex, increasing age and family history.
Disease modifiers
Diabetes, smoking, high alcohol exposure, epilepsy and previous hand trauma are associated with Dupuytren disease, but ordinary manual work alone is not a sufficient causal explanation.
03PathophysiologyThe causal sequence from the underlying abnormality to symptoms and harm.
- 1Tendon-pulley mismatch
A swollen flexor tendon or thickened A1 pulley catches as it enters the sheath, producing a palpable click, painful release or fixed lock.
- 2Mechanical locking cycle
Repeated forceful passage increases local irritation and guarding; the patient may use the other hand to extend the digit as the mismatch progresses.
- 3Myofibroblast nodule formation
In Dupuytren disease, palmar fascial fibroblasts develop contractile myofibroblast behaviour, creating collagen-rich nodules and longitudinal cords.
- 4Progressive joint contracture
Shortening cords tether the metacarpophalangeal and proximal interphalangeal joints into flexion; established joint and skin adaptation can persist after cord division.
04Clinical features and red flagsSymptoms, examination findings, patterns of presentation and time-critical warnings.
A tender palmar metacarpal-head point with a palpable catch as the flexor tendon moves is the key trigger-digit finding.
The finger remains flexed or requires the other hand to extend, indicating advanced mechanical obstruction and risk of secondary joint stiffness.
A firm skin-tethering cord aligned with a ray and fixed joint flexion supports Dupuytren disease rather than flexor-tendon catching.
Inability to place the palm and involved fingers completely flat is a simple marker of functionally relevant contracture.
Contracture at this joint is harder to correct and more prone to residual stiffness, supporting timely hand-service assessment.
05InvestigationsWhat to request, why it matters and how to interpret it.
Read from the initial assessment onwards. Tests may run in parallel in urgent care; first-line, preferred, confirmatory, definitive and gold-standard labels appear only when the chapter explicitly states them.
- 01
First-line dynamic clinical examinationFirst stepFirst line - Why
- Observe tendon catching, locate the A1 pulley and distinguish a movable tendon nodule from a fixed fascial cord.
- Interpretation and limitations
- Reproducible click or lock supports trigger digit; a fixed cord and joint contracture supports Dupuytren disease.
- 02
Tabletop test and joint-angle measurement - Why
- Quantify Dupuytren functional restriction and follow progression at metacarpophalangeal and proximal interphalangeal joints.
- Interpretation and limitations
- Failure to lie flat or increasing contracture supports referral, with proximal interphalangeal disease carrying particular stiffness risk.
- 03
Ultrasound for atypical anatomy - Why
- Differentiate pulley thickening, tendon-sheath ganglion, solid mass or tendon discontinuity when examination is not clear.
- Interpretation and limitations
- Imaging is unnecessary in a classic presentation and should answer a specific diagnostic or procedural question.
- 04
Plain hand radiographs - Why
- Assess trauma, joint osteoarthritis, fixed deformity or calcification rather than confirm either soft-tissue diagnosis.
- Interpretation and limitations
- Bony disease can explain stiffness but does not exclude coexisting trigger or fascial contracture.
- 05
Targeted metabolic or inflammatory tests - Why
- Investigate diabetes, thyroid disease or inflammatory arthritis when history, multiple digits or systemic findings justify testing.
- Interpretation and limitations
- An association affects risk and treatment response but does not replace the characteristic local examination.
06Differential diagnosisRealistic alternatives and the features that help distinguish them.
Flexor-sheath infection
Rapid pain, fusiform swelling, passive-extension pain and systemic or portal-of-entry features distinguish an emergency infection from chronic local catching.
Joint osteoarthritis
Bony enlargement, crepitus and range loss centred at a joint can cause stiffness without a palpable A1-pulley click or palmar fascial cord.
Inflammatory tenosynovitis
Several swollen tendons, prolonged morning stiffness and active synovitis suggest rheumatoid or another systemic inflammatory disorder.
Tendon injury
Trauma, altered finger cascade and inability to flex one joint independently indicates flexor rupture or laceration rather than stenosing tenosynovitis.
Other palmar mass
Ganglion, giant-cell tumour of tendon sheath or malignant soft-tissue lesion may resemble a nodule but lacks the typical tethering cord pattern.
Additional chapter-specific clues
Rapid fusiform swelling, warmth and passive-extension pain demands immediate assessment for flexor-sheath infection rather than routine injection.
07ManagementImmediate care, first-line treatment, alternatives and escalation.
01Trigger first-lineRestore painless tendon glideFirst stepFirst linePainful catching is intermittent and the digit is not fixed, infected or traumatically disrupted.+
- 1Explain the pulley-tendon mismatch and temporarily reduce repetitive forceful gripping without immobilising the whole hand.
- 2Trial a suitable night or task splint and preserve comfortable active tendon glide.
- 3Offer short compatible analgesia and consider one flexor-sheath corticosteroid injection when symptoms persist.
- 4Review clicking, active extension, work and glucose response over six to twelve weeks rather than repeating injection automatically.
02Trigger escalationRelease persistent mechanical obstructionEscalationThe digit remains locked, recurrence follows appropriate injection or daily function remains substantially restricted.+
- 1Reconfirm intact tendons, absence of infection and the exact pulley level before referral.
- 2Discuss percutaneous versus open A1-pulley release according to digit, anatomy, recurrence and local expertise.
- 3Plan bleeding and diabetes management and explain digital nerve, tendon, infection and stiffness risks.
- 4Begin procedure-specific early motion and wound monitoring to reduce secondary stiffness.
03Dupuytren observationMonitor a nodule without disabilityA palmar nodule or early cord is present but the hand lies flat and meaningful activity is unaffected.+
- 1Explain the variable progression and inherited fibrotic tendency without promising prevention through forceful stretching.
- 2Record involved ray and joint angles and teach periodic tabletop self-checking.
- 3Address smoking, alcohol and diabetes for general health without claiming that change will dissolve an established cord.
- 4Arrange review or self-referral advice for loss of flat placement, progression or functional restriction.
04Dupuytren referralTreat functional contractureThe tabletop test becomes positive, function is impaired or metacarpophalangeal or proximal interphalangeal contracture progresses.+
- 1Refer to a hand service before severe proximal interphalangeal stiffness becomes fixed.
- 2Discuss needle fasciotomy, limited fasciectomy and selected dermofasciectomy in terms of recovery, correction and recurrence.
- 3Document skin quality, neurovascular status, previous procedures, occupation and goals to guide choice.
- 4Arrange hand therapy and recurrence surveillance after treatment, recognising that no procedure removes the diathesis.
Key medicines and prescribing safety2 treatments · regimens, roles and cautions+
Trigger-digit corticosteroid injection
Using an aseptic trained local protocol, inject one dose such as triamcinolone acetonide 10 mg into the flexor-sheath region at the A1 pulley, avoiding intratendinous and digital neurovascular placement, then review before considering another intervention.Exclude flexor-sheath and skin infection, warn about flare, skin depigmentation, fat atrophy, tendon or nerve injury and transient hyperglycaemia, and assess anticoagulation without unplanned interruption.
Topical diclofenac for short painful flares
Spread 2–4 g of diclofenac 1.16% gel over intact painful palmar skin per application, allowing at most three or four applications daily for a short period within the label limit.Avoid broken skin, infection and NSAID hypersensitivity, consider concurrent systemic NSAIDs and pregnancy, and stop if dermatitis or systemic adverse effects occur.
08ComplicationsImportant consequences, why they occur and why they matter clinically.
Fixed trigger contracture
A repeatedly locking digit can become unable to extend, causing secondary proximal interphalangeal stiffness, skin maceration and loss of grip function.
Progressive Dupuytren disability
Increasing metacarpophalangeal or proximal interphalangeal flexion interferes with gloves, hand washing, pocket use, shaking hands and placing the palm flat.
Treatment recurrence
Triggering can recur after injection, and Dupuytren cords often reform after needle, injection or open treatment because procedures do not remove biological predisposition.
Procedural injury
Injection or surgery can cause infection, skin change, tendon or digital nerve injury, stiffness, pain and, after Dupuytren surgery, rare complex regional pain syndrome.
09Monitoring and follow-upTreatment response, safety checks and longer-term review.
- For trigger digit, track frequency of clicking, need for manual release, active extension, grip task and any fixed joint contracture.
- After injection, monitor glucose for several days in diabetes and provide return advice for increasing pain, redness, swelling or sensory change.
- For Dupuytren disease, record the involved ray and separate metacarpophalangeal and proximal interphalangeal angles over time.
- Use the tabletop test and specific activities such as gloves, washing, pockets and tool grip as functional progression markers.
- After release or fasciectomy, monitor wound, perfusion, sensation, tendon movement, oedema, stiffness and therapy adherence.
- Reassess any rapidly enlarging, unusually painful or neurologically symptomatic mass rather than recording it as ordinary recurrence.
10Special situationsVariants, exceptions and circumstances that change the usual approach.
The nodule moves differently
A trigger nodule travels with tendon excursion and catches at the pulley; a Dupuytren nodule belongs to tethered palmar fascia and forms a fixed cord.
Tabletop function beats appearance
A prominent nodule can be observed when the hand lies flat, while a modest cord that restricts daily use can justify referral.
Proximal joints are less forgiving
Proximal interphalangeal contracture develops secondary capsular and tendon imbalance and is harder to correct completely than an isolated knuckle contracture.
Injection response varies
Trigger digits of shorter duration respond more reliably; diabetes, several involved digits and fixed locking reduce the chance of durable success.
Recurrence is biology
Dupuytren procedures interrupt or remove a cord but do not remove the fibroproliferative predisposition, so future disease is not necessarily procedural failure.
Never miss the hot sheath
Acutely painful flexed posture with passive-extension pain is an urgent infection pattern, not a severe version of benign triggering.
11Common pitfallsFrequent interpretation and management errors.
- 01
Injecting a red swollen finger labelled trigger digit without excluding flexor-sheath infection.
- 02
Confusing a fixed palmar cord with a tendon nodule that moves and clicks during flexion.
- 03
Ordering routine imaging when dynamic examination and tabletop testing already establish a typical diagnosis.
- 04
Operating on a painless Dupuytren nodule solely to prevent an uncertain future contracture.
- 05
Waiting for extreme proximal interphalangeal deformity before referring a functionally progressive cord.
- 06
Promising that needle or open fascial treatment cures Dupuytren disease and eliminates recurrence.