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
Thumb dislocations
- Interphalangeal dislocation (thumb) (IP)
- Metacarpophalangeal dislocation (thumb) (MCP)
Hand dislocations
- Carpometacarpal dislocation

Hand and finger injuries

Distal finger
Other finger/thumb
- Boutonniere deformity
- Mallet finger
  - Swan neck deformity
- Jammed finger
- Jersey finger
- Trigger finger
- Ring avulsion injury
- De Quervain tenosynovitis
- Infiltrative tenosynovitis
- Metacarpophalangeal ulnar ligament rupture (Gamekeeper's thumb)
Hand
- Dupuytren contracture
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
- Hand and finger dislocations
- Hand and finger fractures
- Gout and Pseudogout
- Hand and finger tendon injuries
- High-pressure injection injury
- Osteoarthritis
- Rheumatoid arthritis

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

External Links

References

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