De Quervain Tenosynovitis

De Quervain tenosynovitis is a stenosing tenovaginitis of the first dorsal extensor compartment: the abductor pollicis longus (APL) and extensor pollicis brevis (EPB) tendons become entrapped beneath a thickened extensor retinaculum at the radial styloid. The name is historical. The dominant histological finding is myxoid degeneration and fibrocartilaginous thickening of the retinaculum with little true inflammatory infiltrate, so this is a degenerative, mechanical overload process rather than a primary inflammatory synovitis.

Who. Population prevalence is roughly 0.5 to 1.3 percent, with a female predominance of around 4 to 6 : 1 and a peak in the fourth to sixth decades. Postpartum and lactating women, occupational repetitive users and heavy smartphone users are over-represented.

Risk factors. The reported associations:

• Repetitive thumb abduction and extension with ulnar wrist deviation (lifting an infant, texting, gripping)
• Postpartum hormonal change plus repetitive lifting (often bilateral)
• Female sex, age 40 to 60
• Associations reported with diabetes and inflammatory arthropathy

The classic patient. A new mother, lifting her baby repeatedly with the thumb extended and the wrist ulnar-deviated; it is frequently bilateral in this group. The same repetitive-loading mechanism explains the rising incidence among heavy smartphone and digital-device users.

The compartment. The first dorsal compartment lies over the radial styloid and carries APL and EPB. It is the first of the six dorsal compartments of the wrist, whose neighbours are set out in dorsal wrist extensor compartments:

• First: APL and EPB, the thumb abductor and extensor
• Second: ECRL and ECRB, the radial wrist extensors
• Third: EPL
• Fourth: EDC and EIP, the finger extensors
• Fifth: EDM, the small finger extensor
• Sixth: ECU, the ulnar wrist extensor

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The septum. The figure everyone quotes is a separate EPB subcompartment in 30-50%, but be precise about which septum you mean. In 87 cadaveric wrists a complete intracompartmental septum was present in 17.2% and an incomplete one in a further 42.5%: roughly 60% had some septation, while only about one in six had the fully separate EPB tunnel that defeats a single release, and a single blind injection with it.

The superficial radial nerve. The same cadaveric series found the nerve crossing over the compartment in 59.5% of wrists, which is why its branches are the structure at risk in this small operative field. Injury to it produces a neuroma or numbness over the dorsal thumb web, Wartenberg's syndrome; handle the nerve gently if it is encountered and protect it throughout.

History. Radial wrist pain, worse with thumb use and gripping, with swelling over the radial styloid, in a new parent or someone whose work is repetitive. Ask specifically about repetitive thumb and wrist activities.

Examination. Tenderness over the first dorsal compartment is the finding that matters. Swelling may be visible, with crepitus on movement. The provocative test is the one most clinicians call Finkelstein.

Finkelstein and Eichhoff. The test most clinicians perform and call "Finkelstein" is technically the Eichhoff manoeuvre: the patient makes a fist over a flexed thumb and the examiner ulnar-deviates the wrist. The true Finkelstein test has the examiner grasp the thumb and pull longitudinally while ulnar-deviating the wrist. Both stretch APL and EPB over the radial styloid, and reproduction of radial wrist pain is positive.

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Not pathognomonic. In a cross-sectional study of 508 university students, 36.8% had a positive Finkelstein test, rising from 12.5% in those using devices under two hours a day to 46.2% at eight hours or more. A sign present in over a third of a general young population cannot be pathognomonic of anything. The Eichhoff version is explicitly prone to false positives, because forcing the thumb into the palm and levering the wrist stresses structures beyond the first compartment.

How to use it. Treat a positive test as supportive in the right clinical context, meaning focal tenderness over the radial styloid and the first dorsal compartment. It does not distinguish APL from EPB, nor de Quervain from intersection syndrome or first CMC arthritis. The WHAT test (resisted thumb extension/abduction with the wrist in hyperflexion) has been proposed as more specific.

A clinical diagnosis. Imaging is usually not required. A positive Finkelstein with radial styloid tenderness is sufficient, and imaging is rarely needed unless the diagnosis is uncertain.

Radiographs. Rule out osteoarthritis or other bony pathology.

Ultrasound. Shows tendon thickening and a separate EPB compartment where one exists, and power Doppler may show neovascularity; it helps identify anatomical variants. Hyperaemia supports active tenosynovitis when the diagnosis is not purely clinical, but does not by itself prove a septum.

The split tendon. Structural tendon injury can present as de Quervain. The figures below are from a kettlebell case with a split EPB: inject into a split at your peril, which is the argument for ultrasound before steroid, and ultrasound is also how healing is documented when you have chosen not to inject.

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Radial-sided wrist pain has several owners, and the discriminator is where exactly it hurts. Pain at the radial styloid supports first-compartment disease; pain at the thumb base is CMC arthritis until a grind test says otherwise.

Because a separate EPB sub-compartment is the dominant cause of injection and surgical failure, it is worth trying to detect it before treatment rather than only on ultrasound or at operation. Finkelstein and Eichhoff cannot do this, because they stress both tendons at once; selective provocative testing can.

What a positive EPB test changes. Pain on resisted thumb MCP extension with the wrist slightly flexed raises the probability of a septated compartment, which predicts failure of a single blind injection. It is therefore a reason either to inject under ultrasound guidance into both sub-compartments or to counsel the patient earlier about surgical release.

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The sequence. Conservative treatment comes first and is effective in the majority of cases. A thumb spica splint rests the first dorsal compartment, and activity modification means avoiding the aggravating activities, with ergonomic advice. Surgery is for those who fail.

Injection. Corticosteroid into the tendon sheath, not the tendon, is the first-line treatment, ideally ultrasound-guided and followed by 3-4 weeks of thumb spica; it may be repeated once for a partial response. Guidance ranked highest for pain relief in the network meta-analysis, but blind injection remains effective and far cheaper, and the trade-off is set out under Controversies below. The conventionally quoted 70-80% success rate comes from observational cohorts rather than trial data, and it falls where an intracompartmental septum is present: in an ultrasound cohort 30% had recurred by six weeks, the septum carrying an adjusted OR of 18.4 and each additional tendon slip an OR of 24.7.

When ultrasound shows a septum. Do not put the whole dose in one tunnel. Split the injectate, half along APL and half along EPB, starting at the point of maximum tenderness; a single blind shot into the APL subsheath is a common reason the 70-80% figure collapses.

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Surgery. First dorsal compartment release is the definitive treatment for refractory cases. The indications:

• Failed conservative treatment (two injection trials)
• Recurrent symptoms
• Patient preference

Incision. Transverse or longitudinal over the first dorsal compartment.

The steps. Six, in this order:

1. Protect the superficial radial nerve branches
2. Identify the first dorsal compartment
3. Release the retinaculum longitudinally
4. Check for a separate EPB septum
5. Release the EPB compartment if present
6. Confirm both APL and EPB glide freely

Where to divide the retinaculum. A specific pitfall of the release is volar (palmar) subluxation of the tendons: if the retinaculum is divided in the wrong place, APL and EPB can bowstring across the radial styloid when the wrist flexes, causing painful snapping. The preventive principle is where you incise:

• Divide the retinaculum along its dorsal (dorso-ulnar) margin, not its volar edge, leaving the bulk of it as a volar leaf against which the tendons rest, so they cannot fall palmar-ward
• Avoid a complete circumferential release; some surgeons additionally preserve or reconstruct a retinacular sling (a step-cut or Z-lengthening, for example) in patients judged at higher risk of subluxation
• After release, take the wrist through flexion-extension and radial-ulnar deviation to confirm both tendons stay seated and glide freely

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Outcomes are better with a shorter symptom duration, a successful response to injection and a complete surgical release. They are worse with a missed EPB septum at surgery, with nerve injury, and with delayed treatment.

Ultrasound-guided versus landmark injection. The 2023 network meta-analysis ranked ultrasound-guided injection highest for pain. However, blind injection remains effective and far cheaper, and no adequately powered head-to-head RCT has shown a clinically meaningful functional difference. It is reasonable to reserve guidance for a failed blind injection or a known septum.

Role and timing of splinting. Adding 3-4 weeks of thumb spica to injection improves function statistically, but the difference may not reach a clinically important threshold, and splints are poorly tolerated by caregivers. The optimal duration, and whether splinting alone has any durable role, remain unsettled.

Open versus minimally invasive release. Mini-open, percutaneous and ultrasound-guided releases report fewer wound issues, but the evidence is largely low-level (case series). Open release with direct visualisation of any EPB septum and protection of the superficial radial nerve remains the reference standard.

The injection success figure. Commonly quoted single-injection cure rates of 70 to 80 percent derive from observational and mixed cohorts; the only included trial in the Cochrane review was tiny and confined to pregnant or lactating women. True durable single-injection success is likely lower when a septum is present.