Hand and finger dislocations: Difference between revisions
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==Differential Diagnosis== | ==Differential Diagnosis== | ||
{Hand and finger injury DDX}} | {{Hand and finger injury DDX}} | ||
==See Also== | ==See Also== |
Revision as of 06:55, 1 June 2015
DIP Joint
- Uncommon due to firm attachment of skin and subq tissue to underlying bone
- When dislocations do occur usually are dorsal
Reduction
- Digital nerve block
- Apply longitudinal traction/ hyperextension followed by dorsal pressure to phalanx base
- Irreducible cases due to entrapment of avulsion fx, profundus tendor or volar plate
Management
- Splint in slight flexion w/ dorsal splint x3wk
PIP Joint
- Common; due to axial load and hyperextension
- Dorsal dislocation occurs when volar plate ruptures
- Lateral dislocations occur when one of collateral ligaments ruptures w/ at least partial avulsion of volar plate from middle phalanx
Reduction
- Same as for DIP joint
Management
- Stable Reduction: 3wk of immobilization in 20-30 deg of flexion
- Unstable reduction: Surgery
- Displacement occurs during active range of motion
- Displacement occurs during passive stressing of joint
- >20 deg of deformity and instability w/ lateral testing
MCP Joint
- Usually due to hyperextension forces that rupture volar plate causing dorsal dislocation
- Two types:
- Simple: subluxation
- Joint appears hyperextended to 60-90 deg
- Complex: dislocation
- MCP joint is in moderate hyperextension w/ metacarpal head prominent in palm
- Volar plate is interposed in MCP joint space
- X-ray may show seasamoid within joint space (pathognomonic)
- Closed reduction is not possible
- Simple: subluxation
Reduction
- Do NOT hyperextend joint (may convert subluxation into complete dislocation)
- Flex the wrist to relax the flexor tendon
- Apply pressure over dorsum of proximal phalanx in distal and volar direction
Management
- Splint w/ MCP joint in flexion
- Refer to hand surgeon
CMC Joint
- Uncommon due to strong ligaments and insertions of wrist flexors/extensors
- Cause is usually result of high-sped mechamisms
- Dislocates usually dorsally and associated w/ fracture(s)
Reduction
- Traction and flexion w/ simultaneous longitudinal pressure on metacarpal base
Management
- Refer to hand surgeon
Thumb
IP Joint
- Uncommon
- Dislocations often associated w/ open injuries
Reduction
- Median nerve block
- Reduce similar to IP joint of other digits
Management
- Immobilization in mild flexion for 3wk is usually all that is required
MCP Joint
- Like other MCP joint dislocations, may be simple or complex
Reduction
- Radial and median nerve blocks
- Pressure directed distally on base of prox phalanx w/ metacarpal flexed and abducted
Management
- Stable reduction: Immobilize in thumb spica w/ MCP joint in 20 deg flexion for 4wk
- Unstable reduction: ORIF
MCP Ulnar Ligament Rupture
- Also known as gamekeeper's thumb or skier's thumb
- Ulnar ligament ruptures at insertion into prox phalanx (due to radial deviation of MCP)
- X-ray (perform before joint stressing)
- Bony avulsion from insertion of UCL into proximal phalanx
- Associated condylar fracture
- Proximal phalanx volar subluxation and radial deviation suggests complete UCL rupture
- Exam
- Swelling and localized tenderness over ulnar border of joint
- Weakness of pinch
- Partial versus complete rupture
- Valgus stress testing with joint in full extension and in 30 deg of flexion
- >35 deg of joint laxity or 15 deg of laxity beyond that present in uninjured thumb is consistent w/ complete UCL rupture
- Valgus stress testing with joint in full extension and in 30 deg of flexion
Management
- Partial rupture
- Immobilize in thumb spica for 4wk
- Full rupture
- Referral w/in 1wk
Differential Diagnosis
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
See Also
Source
- Tintinalli's
- Rosen's