Swan neck deformity
Background
- Lateral bands displace proximally and dorsally = increased extension of PIP.
- FDP unopposed
Causes
- Rheumatoid arthritis
- Untreated mallet finger
- Laxity of the fibrous plate inside the hand at the base of the fingers or of the finger ligaments
- Spasticity from nerve damage
- Other arthritis
- Ruptured finger tendon
- Misalignment in the healing of middle phalanx fracture
Clinical Features
- PIP extension with DIP flexion
Differential Diagnosis
- Joint volar subluxation
- FDS laceration
- Intrinsic contracture
Hand and finger injuries
- Distal finger
- Other finger/thumb
- Boutonniere deformity
- Mallet finger
- Jammed finger
- Jersey finger
- Trigger finger
- Ring avulsion injury
- De Quervain tenosynovitis
- Infiltrative tenosynovitis
- Metacarpophalangeal ulnar ligament rupture (Gamekeeper's thumb)
- Hand
- Wrist
- Drummer's wrist
- Ganglion cyst
- Lunotriquetral ligament instability
- Scaphoid fracture
- Extensor digitorum tenosynovitis
- Compressive neuropathy ("bracelet syndrome")
- Intersection syndrome
- Snapping Extensor Carpi Ulnaris
- Vaughn Jackson syndrome
- General
Evaluation
- Clinical diagnosis
- Consider x-ray to rule out avulsion fracture
Management
- Extension block splint
- Refer to orthopedic surgery
Disposition
- Discharge
External Links
References
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