Swan neck deformity

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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

Evaluation

  • Clinical diagnosis
  • Consider x-ray to rule out avulsion fracture

Management

  • Extension block splint
  • Refer to orthopedic surgery

Disposition

  • Discharge

See Also

External Links

References