Lunate/Perilunate Dislocation

Question 1

Describe lunate/perilunate dislocation

Answer 1

High energy trauma resulting in ligamentous rupture (radioscaphocapitate, scapholunate interosseus, lunotriquetral interosseus)

Question 2

Which ligaments are injured in lunate/perilunate dislocation?

Answer 2

• Radioscaphocapitate
• Scapholunate Interosseus
• Lunotriquetral Interosseus

Question 3

MOI for lunate/perilunate dislocation

Answer 3

• Axial load in a hyperextended and ulnarly deviated position
• Dislocation and/or fracture usually occurs if hyperextension exceeds 100 degrees

Question 4

Lunate/perilunate dislocation and/or fracture usually occurs if:

Answer 4

Hyperextension exceeds 100 degrees

Question 5

Complications of lunate/perilunate dislocation

Answer 5

• Median nerve damage

- Skin necrosis 2/2 underlying pressure

Question 6

Treatment of lunate/perilunate dislocation

Answer 6

• Closed reduction followed by IF ASAP

- Open reduction MAY be necessary