Interphalangeal dislocation (thumb)

Background

• Also known as the IP joint
• Uncommon
• Dislocations often associated with open injuries

Clinical Features

• Thumb pain/deformity

Differential Diagnosis

Hand and finger dislocations

• Finger dislocations
  • Distal interphalangeal dislocation (finger) (DIP)
  • Proximal interphalangeal dislocation (finger) (PIP)
  • Metacarpophalangeal dislocation (finger) (MCP)
• Thumb dislocations
  • Interphalangeal dislocation (thumb) (IP)
  • Metacarpophalangeal dislocation (thumb) (MCP)
• Hand dislocations
  • Carpometacarpal dislocation

Evaluation

• X-ray thumb (PA and lateral)

Management

Reduction

• Median nerve block
• Reduce similar to IP joint of other digits

Splinting

• Immobilization in mild flexion for 3wk is usually all that is required

Disposition

• Outpatient

See Also

• Hand and finger dislocations