First Dorsal Compartment Approach (de Quervain Release)

What it exposes. This is a small, focused exposure of the first dorsal (extensor) compartment of the wrist — the osseofibrous tunnel that carries the abductor pollicis longus (APL) and extensor pollicis brevis (EPB) tendons over the radial styloid. By dividing the thickened extensor retinaculum that forms the roof of the compartment, the entrapped tendons are freed. Primary indication. De Quervain stenosing tenosynovitis that has failed an adequate trial of non-operative management — a thumb spica splint plus one or more corticosteroid injections into the sheath. De Quervain disease is the commonest cause of radial-sided wrist pain in adults, especially prevalent in new mothers and middle-aged women. The pathology is degenerative thickening of the extensor retinaculum over the radial styloid, producing a tight osseofibrous tunnel that traps the tendons — so release of the retinicular roof directly relieves the stenosis, which is why this focused approach is the definitive operation. Contraindications: - Diagnosis not established — atypical radial-sided wrist pain must first be distinguished from CMC arthritis of the thumb, scaphoid pathology, intersection syndrome, and Wartenberg neuritis of the superficial radial nerve

• Not yet tried non-operative care — a corticosteroid injection into the sheath is successful in a majority of early cases and should precede surgery
• Active infection or broken skin over the radial styloid
• Uncontrolled systemic inflammatory disease (for example active rheumatoid synovitis) — address the medical disease first Alternative and adjunct procedures include corticosteroid sheath injection (first-line definitive treatment), thumb spica splintage, tenosynovectomy for true proliferative inflammatory synovitis, and APL tendon harvest for reconstructive transfers such as an opponensplasty. ### Position and Landmarks Position: supine on a hand table. The affected arm is abducted onto a radiolucent hand table. An upper-arm tourniquet is applied and the limb exsanguinated with an Esmarch bandage — the field is small and dry, so a tourniquet is near-essential. The hand is pronated and rests flat, with the thumb and radial styloid pointing to the ceiling so the radial dorsum of the wrist is uppermost. Finger-trap traction or a lead hand may hold the thumb abducted and the wrist slightly ulnar-deviated, putting the first compartment under slight tension and making the tendons palpable. Operating loupe magnification is recommended — the dorsal sensory branches of the radial nerve are small and are best protected under magnification. Key bony landmarks: the radial styloid (the compartment lies immediately over and just distal to it); Lister's tubercle (the third compartment, EPL, grooves it ulnar-ward, and the first compartment lies radial to this reference point); and the base of the first metacarpal (the distal extent of the compartment). Key soft-tissue landmarks: the APL and EPB tendons form the radial (dorsal) border of the anatomical snuffbox — with the thumb abducted and extended they are usually palpable as a taut ridge over the radial styloid; the anatomical snuffbox is bounded dorsally by APL/EPB and on its ulnar side by extensor pollicis longus, with the radial artery crossing its floor; and the extensor retinaculum is the tough transverse band over which the compartment runs. ### Incision Planning A short transverse incision (roughly 2 to 3 cm) is made directly over the radial styloid, lying in the natural skin creases for the best cosmetic result. Alternatively an oblique or longitudinal incision is made along the line of the compartment for wider exposure — advocated by some surgeons to reduce the risk to the crossing radial nerve branches. Whatever the skin incision, the subcutaneous layer is always spread longitudinally and bluntly in the line of the tendons, never cut transversely, to avoid the superficial radial nerve.

The exposure is a dissection to a tendon sheath, not between two muscles of differing nerve supply. Work down through the layers over the radial styloid, protecting the superficial radial nerve at every step, then open the retinacular roof along its dorsal margin and deliberately hunt for a separate EPB sub-sheath.

Anatomy That Drives the Technique

The six dorsal compartments. The extensor retinaculum is raised into six longitudinal osseofibrous tunnels over the distal radius and ulna, numbered radial to ulnar. The first is the most radial and contains the thumb abductors and extensors at the wrist.

The EPB sub-sheath (septum). A fibrous septum frequently subdivides the first compartment into a separate tunnel for EPB, lying dorsal to APL. The reported incidence varies widely across anatomical and surgical studies, so the safe rule is to always look for and release a separate EPB compartment rather than assume a single shared tunnel. Missing it is the classical cause of persistent post-operative pain.

Exposure Sequence

Structures at Risk

Superficial radial nerve injury management: - If a branch is identified as divided intra-operatively, do not sacrifice further tissue hunting for a tiny sensory branch; if a discrete neuroma-in-continuity forms, it can be buried later.

• If numbness or a painful neuroma appears post-operatively, expectant care and desensitisation therapy come first; exploration and neuroma excision or transfer are reserved for refractory, disabling pain. ### Extensile Options Proximal extension. The incision can be extended proximally along the radial border of the distal forearm to expose the APL and EPB muscle bellies — used for a tenosynovectomy in inflammatory arthritis, or to harvest an APL slip for a tendon transfer such as an opponensplasty. The superficial radial nerve becomes more proximal and plexiform here, so dissection remains blunt and protected. Distal extension. Extending toward the thumb metacarpophalangeal joint follows the EPB distally and gives access to the thumb extensor mechanism — useful when addressing combined pathology such as a simultaneous trigger thumb or MCP issue. Important limitation. This is fundamentally a discrete compartment release, not an extensile approach. It does not give broad access to the wrist joint or the carpus; for those needs a dorsal wrist approach is chosen instead. ### Closure and Post-operative Care - Haemostasis with the tourniquet down; the retinicular roof is left open (the decompression).
• If tendon subluxation is a concern, a retinicular sling is created from the released flap; then skin only is closed (subcuticular or interrupted).
• A thumb spica splint is worn for 1 to 2 weeks, with elevation and early tendon-gliding finger exercises to prevent stiffness.
• Range of motion of the thumb and wrist is begun early within the limits of comfort; strengthening and gripping return at 4 to 6 weeks. Release is highly effective when complete, with most patients pain-free by 6 weeks. ### Complications

At a Glance The

approach to the first dorsal compartment is the operative exposure for de Quervain stenosing tenosynovitis, the commonest cause of radial-sided wrist pain, arising from degenerative thickening of the extensor retinaculum over the radial styloid that traps the APL and EPB tendons. The patient is positioned supine on a hand table with a tourniquet, the radial styloid uppermost. There is no true internervous plane, as both tendons are radial-nerve supplied — this is an approach to a tendon sheath. The critical at-risk structure is the superficial radial nerve, whose dorsal sensory branches cross the field; injury causing neuroma and numbness is the commonest complication, prevented by blunt longitudinal subcutaneous spreading and loupe magnification. The retinicular roof is opened along its dorsal margin so the volar retinicular sling is preserved, preventing volar tendon subluxation. The surgeon must always probe for and release a separate EPB sub-sheath, the classic cause of persistent pain if missed. Closure is of skin only over a thumb spica splint; the sheath is left open. ### Rapid Exam Q&A

Critical Exam Points

Mnemonics

Guidelines and Global Practice

De Quervain disease is managed worldwide and the principles converge across examination systems. It is not an arthroplasty or fixation topic, so joint-registry evidence does not apply; the evidence base is clinical series and anatomical studies.

Pathology understanding: classic de Quervain disease is a degenerative thickening of the extensor retinaculum rather than an inflammatory synovitis, which is why decompression of the fibrous roof works and why tenosynovectomy is reserved for true proliferative (inflammatory) synovitis. Global practice variation: the procedure is identical in high- and limited-resource settings — it needs only basic hand surgery instrumentation and loupe magnification. Variation is in non-operative access (availability of splintage and injection) rather than in the operation itself. Consent (globally applicable): discuss superficial radial nerve injury and neuroma (the commonest complication), persistent or recurrent pain (usually an incompletely released EPB sub-sheath), volar tendon subluxation, tender scar, and the small risk to the radial artery.