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Swan-Neck Deformity

Hyperextension of the proximal interphalangeal joint with flexion of the distal interphalangeal joint due to imbalance of intrinsic and extrinsic finger flexors and extensors caused by rheumatoid arthritis, lupus, mallet finger, or volar plate insufficiency.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

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This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Ortopedi ve Travmatoloji department. Book Appointment →

What is Swan-Neck Deformity?

Swan-neck deformity (SND) is a finger deformity defined by hyperextension at the proximal interphalangeal (PIP) joint and flexion at the distal interphalangeal (DIP) joint. The pathomechanics involve imbalance between flexor and extensor tendons and intrinsic muscles, with proximal extensor pull through the central slip and intrinsic muscles pulling the PIP into hyperextension while the FDP and DIP collapse into flexion.

Causes are diverse: rheumatoid arthritis (most common — synovitis weakens volar plate and FDS), systemic lupus erythematosus (Jaccoud arthropathy with reducible deformity), mallet finger with chronic terminal extensor injury (DIP flexion increases force on PIP), volar plate laxity (post-trauma or congenital ligamentous laxity), chronic FDP rupture, and intrinsic tightness post-burn or compartment syndrome.

Nalebuff classification (I-IV) helps guide treatment based on PIP flexibility and intrinsic involvement: Type I (flexible PIP, full motion in all positions); Type II (intrinsic tightness with full extension but limited flexion when MCP extended); Type III (limited PIP flexion in all positions, soft tissue contracture); Type IV (joint destruction with stiff PIP). Diagnosis combines history, examination of all four positions (PIP and DIP at rest and with MCP extension), assessment of intrinsic tightness, and imaging to evaluate joint condition. Treatment ranges from finger-based splints and silver rings (Oval-8) for type I, soft tissue procedures (FDS tenodesis, intrinsic release, lateral band rebalancing) for types I-III, and PIP arthrodesis or arthroplasty for type IV with severe joint disease.

Symptoms

Hyperextension of the PIP joint with DIP flexion
Difficulty making a fist or flexing the finger fully
Snapping or locking with PIP hyperextension
Pain at the PIP joint or DIP joint
Functional limitation in pinch, grip, and fine motor tasks
Stigmata of rheumatoid arthritis, lupus, or prior trauma
Progressive deformity over months to years

Risk Factors

Rheumatoid arthritis with chronic synovitis
Systemic lupus erythematosus (Jaccoud arthropathy)
Mallet finger and chronic terminal extensor injury
Volar plate laxity (post-trauma or congenital hyperlaxity)
Chronic FDP rupture or attritional tendinopathy
Intrinsic tightness post-burn, compartment syndrome, or spasticity
Cerebral palsy and other neuromuscular disorders

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • New finger deformity with hyperextension at PIP
  • Functional limitation affecting pinch and grip
  • Pain or instability at PIP or DIP joint
  • Suspected rheumatoid arthritis or lupus with hand involvement
  • Following mallet finger with progressive deformity
  • Failure of splinting and conservative therapy
  • Considering surgery to improve function and aesthetics

Treatment Methods

01
Conservative: figure-of-eight or silver ring splints (Oval-8) for type I (flexible) deformity to block PIP hyperextension while allowing flexion
02
Disease-specific medical therapy for rheumatoid arthritis (DMARDs, biologics) and lupus to prevent progression
03
Mallet finger management with prolonged extension splinting and consideration of late terminal tendon repair
04
FDS tenodesis or central slip tenotomy (Fowler) for type II to balance forces
05
Lateral band relocation (Littler) for type II-III to restore intrinsic balance
06
Soft tissue release for intrinsic tightness; PIP joint capsulectomy and dorsal capsulotomy for fixed contractures
07
PIP arthrodesis (in fingers requiring stability) or arthroplasty (silicone or pyrocarbon) for type IV with severe joint disease; structured hand therapy and long-term splinting to prevent recurrence

Which Department to Visit?

You can visit our Ortopedi ve Travmatoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.