SN4 SHORT NOTE 5M

Define De Quervain’s Tenosynovitis. Describe its clinical features and management.

General Surgery · Final Professional

Definition

De Quervain’s tenosynovitis is a stenosing tenosynovitis of the first dorsal extensor compartment of the wrist, which contains the abductor pollicis longus (APL) and extensor pollicis brevis (EPB) tendons. Thickening of the sheath causes pain on thumb and wrist movement. It is common in new mothers (lifting the baby) and after repetitive thumb use.

Clinical Features

Pain and tenderness over the radial styloid (the lateral side of the wrist at the base of the thumb), worse on thumb and wrist movement, sometimes with local swelling. Finkelstein’s test — flexing the thumb into the palm and ulnar-deviating the wrist — reproduces the pain and is diagnostic.

CLINICAL PEARL

Finkelstein’s test (thumb tucked into the fist, wrist deviated ulnar-ward) reproduces sharp pain over the radial styloid in de Quervain’s — the key clinical sign.

Management

Treatment is usually conservative: a thumb-spica splint, activity modification, NSAIDs, and a corticosteroid injection into the first compartment (highly effective). Persistent cases are treated by surgical release of the first dorsal compartment.

Clinical Note

De Quervain’s is essentially a mismatch between the swollen APL and EPB tendons and the tight fibro-osseous tunnel of the first dorsal compartment, and the condition is especially common in the post-partum period from repeated lifting of the baby with the thumb abducted. A steroid injection accurately placed into the compartment is one of the most reliable non-operative treatments in the hand, and surgical release cures the resistant cases.

CLINICAL PEARL

If Finkelstein’s test reproduces sharp pain at the radial styloid, the diagnosis is de Quervain’s; an accurately placed injection into the first dorsal compartment is one of the most effective treatments in the hand.

DANGER / REMEMBER

A related and easily confused condition is intersection syndrome, felt a little more proximally on the dorsoradial forearm where the first and second compartments cross; distinguishing it matters because the point of tenderness and the site of any injection differ, and mislabelling leads to an injection in the wrong place.

Finkelstein test reproduces the pain and confirms the diagnosis.

KEY POINT

Key points TO remember

Stenosing tenosynovitis of the 1st dorsal compartment (APL & EPB).
Common in new mothers/repetitive thumb use; pain/tenderness at the radial styloid.
Finkelstein’s test reproduces the pain (diagnostic).
Splint, NSAIDs, steroid injection; surgical release if persistent.

EXAM TIP

Sources: Maheshwari's Essential Orthopaedics; Apley & Solomon's System of Orthopaedics and Trauma; AO Principles of Fracture Management.

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