Trigger Finger

Upper Limb

Overview

Trigger finger is a common condition affecting the flexor tendons of the hand, characterized by inflammation and thickening of the tendon sheath causing mechanical catching and locking during finger flexion and extension. The condition typically presents with pain, clicking, or locking of the affected digit, most commonly affecting the thumb, middle, and ring fingers. It ranges from mild clicking to severe locking requiring manual extension of the finger.

Pathophysiology

The pathophysiology involves thickening and fibrocartilaginous change of the A1 pulley and flexor tendon (a degenerative rather than inflammatory process), causing the tendon to thicken and develop nodules. As the finger flexes, the enlarged tendon passes through the narrowed pulley with difficulty, creating a catching sensation. Repetitive gripping, sustained finger flexion and microtrauma lead to collagen deposition and eventual mechanical obstruction. This creates a cycle of thickening, scarring and further restriction of tendon gliding within the sheath.

Typical Presentation

Site

Palmar aspect of the metacarpophalangeal joint (MCP) of affected digit; thumb, index, middle, ring, or little finger; often bilateral in 10-30% of cases

Quality

Catching, clicking, or locking sensation during finger movement; morning stiffness; sharp pain at the MCP joint level; sensation of mechanical block

Intensity

Mild clicking (stage 1) to complete locking requiring manual extension (stage 4); symptoms typically worse in morning and with gripping activities

Aggravating

Gripping activities, repetitive finger flexion, sustained finger positions, cold weather, morning stiffness, forceful grasping, fine motor tasks

Relieving

Rest, gentle passive extension, massage of the palm, anti-inflammatory measures, ice application, avoiding aggravating activities

Associated

Morning swelling at MCP joint, weakness in grip strength, nocturnal symptoms, referred pain to palm and distal fingers, callus formation on palm, difficulty with daily activities (writing, buttoning, typing)

Orthopaedic Tests

Test descriptions are written with AI assistance from standard clinical texts. Where a test lists Sources, its description has been checked against them; those sources are independent and do not endorse OsteoKit. Accuracy figures and grades (A–D) appear only when checked against the published study; tests without one are marked “No accuracy study”.

Further reading: full test procedures are described in standard clinical examination texts, e.g. Magee & Manske, Orthopedic Physical Assessment (7th ed.), and Cook & Hegedus, Orthopedic Physical Examination Tests: An Evidence-Based Approach (2nd ed.).

No accuracy study

Flexion contracture test

Procedure

Ask the patient to make a full fist and then straighten the affected finger. If it stays bent, gently try to straighten it passively and note whether it is locked (releases with a snap) or has a fixed contracture, usually at the PIP joint.

Positive Finding

The finger stays flexed and cannot be straightened actively, straightens only passively with a painful snap, or has a fixed loss of PIP extension.

Interpretation

A locked finger or a fixed PIP contracture means more advanced triggering. It also helps separate trigger finger from other causes of a bent finger, such as Dupuytren's contracture or a central slip (boutonnière) injury, which do not snap.

Further reading

No accuracy study

Triggering phenomenon test

Procedure

Place a fingertip over the A1 pulley (at the distal palmar crease for the fingers, at the MCP crease for the thumb) while the patient slowly makes a full fist and then opens the hand, several times.

Positive Finding

A palpable click or catch, or the finger sticking in flexion and then snapping straight.

Interpretation

Triggering is the defining sign of trigger finger. It may not appear at every visit, so ask whether it is worse in the morning and ask the patient to show you. The reference previously shown for this test could not be matched to any published paper and has been withdrawn. A literature search (Europe PMC, September 2026) found no study reporting the diagnostic accuracy of this test, so no figure is shown.

Sources

No accuracy study

Palpation of tendon nodule

Procedure

Palpate over the A1 pulley at the base of the affected digit on the palmar side while the patient gently bends and straightens the finger.

Positive Finding

Tenderness over the A1 pulley, often with a small nodule that moves with the tendon.

Interpretation

Supports trigger finger, especially when a moving nodule can be felt to catch. Tenderness alone, without catching, can occur in early disease.

Sources

No accuracy study

Morning stiffness and symptom history

Procedure

Ask about stiffness, catching or locking of the finger, what time of day it is worst, and whether the patient has to use the other hand to straighten it. Also ask about diabetes, rheumatoid arthritis and repetitive gripping.

Positive Finding

Catching or locking that is usually worst in the morning and eases with use, with pain at the base of the finger in the palm.

Interpretation

Supports trigger finger. Prolonged morning stiffness in several joints, or swelling of the joints rather than the tendon, points instead towards an inflammatory arthritis.

Further reading

No accuracy study

Pain with resisted flexion at PIP joint (Flexor Digitorum Superficialis test)

Procedure

Hold the patient's other fingers fully straight, then ask them to bend the PIP joint of the affected finger against your resistance.

Positive Finding

Pain at the base of the finger over the A1 pulley during resisted flexion.

Interpretation

Suggests flexor tendon sheath irritation. This is not a recognised diagnostic test for trigger finger; triggering on active movement remains the key sign.

Sources

No accuracy study

Ultrasound-guided clinical correlation

Procedure

High-frequency ultrasound over the A1 pulley in long and short axis, with dynamic scanning while the patient bends and straightens the finger.

Positive Finding

Thickening of the A1 pulley, swelling or a nodule of the flexor tendon at the pulley, and catching of the tendon seen during movement.

Interpretation

Not needed to diagnose a typical case, which is clinical. Ultrasound helps when the diagnosis is unclear and is commonly used to guide injection. The reference previously shown for this test could not be matched to any published paper and has been withdrawn. A literature search (Europe PMC, September 2026) found no diagnostic accuracy study of ultrasound for trigger finger, so no figure is shown.

Sources

⚠ Red Flags

  • •Sudden onset with significant trauma or laceration suggesting tendon rupture
  • •Signs of infection (warmth, erythema, purulent discharge) suggesting infectious tenosynovitis
  • •Rapid progression with complete loss of finger extension suggesting advanced pathology
  • •Systemic symptoms (fever, malaise) suggesting inflammatory arthropathy or infection
  • •Signs of vascular compromise (color change, coolness, numbness) suggesting circulatory problem
  • •Multiple joint involvement with constitutional symptoms suggesting rheumatoid arthritis or other systemic condition

⚡ Yellow Flags

  • •Occupational or recreational activities requiring intensive gripping creating perpetuating mechanical stress
  • •Catastrophizing about hand function affecting work capacity or self-image
  • •Belief that condition will worsen without intervention creating health anxiety
  • •Secondary gain from avoiding work or activities due to hand dysfunction
  • •Excessive focus on symptom severity without engagement in conservative management
  • •Social isolation due to inability to perform meaningful activities

Osteopathic Techniques

Trigger finger is treated first with a steroid injection into the tendon sheath or a splint, especially when it is recent and uncomplicated; surgery is the option when these fail. A review found orthoses that immobilise one joint of the finger for 6–10 weeks reduced pain and triggering. No trials of osteopathic techniques were found.

Region

Forearm flexor compartment (FDS and FDP)

Technique

Soft tissue, elbow and forearmNo trials found

Rationale

Soft tissue to the forearm flexor and extensor muscles that move the wrist and fingers.

How it's done, cautions & evidence

How it's done

Hands-on kneading, stroking and sustained pressure to the forearm extensor and flexor muscles, their tendon origins at the epicondyles, the supinator, the pronators and the triceps. Deep transverse friction across the tendon origin is part of the Cyriax method for lateral elbow pain.

Cautions

Avoid direct pressure on an olecranon bursitis. A red, warm, tender bursa, especially with fever, may be septic and needs medical review.

Evidence in Trigger Finger

Searched 26 Oct 2026: no trials of forearm soft tissue in trigger finger.

Region

A1 pulley region, hand intrinsics and deep palmar fascia

Technique

Soft tissue, wrist and handNo trials found

Rationale

Soft tissue to the wrist and hand: flexor retinaculum, palmar fascia, thenar and intrinsic muscles.

How it's done, cautions & evidence

How it's done

Hands-on kneading, stroking and sustained pressure to the soft tissues of the wrist and hand: the flexor retinaculum and thenar muscles over the carpal tunnel, the first dorsal compartment, the wrist ligaments, the palmar fascia, the hand intrinsics and the finger flexor sheath at the A1 pulley. In carpal tunnel trials, soft tissue mobilisation was often combined with neural mobilisation.

Cautions

In Guyon canal syndrome, avoid prolonged pressure over the hypothenar eminence. After a fall on the hand, rule out a fracture first: scaphoid fractures are often missed on the first X-ray.

Evidence in Trigger Finger

Searched 26 Oct 2026: no trials of hand soft tissue in trigger finger.

Region

Wrist and carpal joints

Technique

Articulation, wrist and handNo trials found

Rationale

Gentle glides of the wrist, carpal and hand joints to restore movement.

How it's done, cautions & evidence

How it's done

Passive, rhythmic, low-velocity glides of the radiocarpal, midcarpal and intercarpal joints, the distal radioulnar joint, the thumb carpometacarpal (CMC) joint and the finger joints, within or up to the end of the available range. In thumb-base osteoarthritis trials this was Maitland-style passive accessory gliding of the CMC joint.

Cautions

After a fall on the hand, rule out a fracture first: scaphoid fractures are often missed on the first X-ray, so snuffbox pain needs a splint and repeat imaging. Do not move a joint that is splinted for a tendon injury: the DIP in mallet finger, the PIP in a central slip (boutonnière) injury.

Evidence in Trigger Finger

Searched 26 Oct 2026: no trials of wrist mobilisation in trigger finger.

Rehabilitation Exercises

Gentle Finger Flexion and Extension Gliding

Range of MotionBeginner

Forearm Flexor Muscle Stretch with Wrist Extension

StretchingBeginner

Differential Tendon Gliding Exercises (Hook, Straight, Full Fist)

Range of MotionBeginner

Intrinsic Hand Muscle Activation (Lumbrical Exercises)

StrengtheningIntermediate

Pronator and Supinator Muscle Stretching

StretchingBeginner

Gentle Wrist Mobilization in Multiple Planes

Range of MotionBeginner

Progressive Grip Strengthening with Therapy Putty

StrengtheningIntermediate

Ergonomic Hand and Wrist Positioning Awareness

PosturalBeginner

Forearm Flexor Eccentric Loading Exercises

StrengtheningAdvanced

Finger Circumduction and Multi-Directional Movement

Range of MotionIntermediate

Deep Palm and Hand Intrinsic Self-Massage Release

StretchingBeginner

Finger Abduction and Adduction Resistance Exercises

StrengtheningIntermediate

Referral Criteria

  • •Failure to improve with conservative management after 6-12 weeks indicating need for corticosteroid injection or surgical intervention
  • •Progression to complete locking requiring manual extension suggesting advanced stage requiring specialist assessment
  • •Severe functional impairment affecting work or activities of daily living requiring specialist hand therapy or surgery
  • •Suspected infection or inflammatory arthropathy (rheumatoid arthritis, diabetes-related stiffness) requiring medical investigation
  • •Recurrent symptoms after steroid injection suggesting need for surgical consultation (A1 pulley release)
  • •Multiple finger involvement with systemic symptoms suggesting rheumatological condition requiring rheumatology referral
  • •Failure of mechanical treatment combined with progressive neurological symptoms suggesting nerve compression
  • •Patient desire for definitive surgical treatment after appropriate conservative management trial