Wrist & Hand: Scaphoid fractures Flashcards Preview

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Flashcards in Wrist & Hand: Scaphoid fractures Deck (16)
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1

what is the most commonly fractured carpus?

scaphoid

2

how is the scaphoid bone divided?

3 parts:
proximal pole
waist
distal pole

3

branches of which artery supply the scaphoid bone?

radial artery - dorsal branch of the radial artery

4

where does the dorsal branch of the radial artery enter the scaphoid bone and what is the clinical significance of this?

distal pole and travels in a retrograde fashion towards the proximal pole. fractures can compromise the blood supply leading to avascular necrosis (AVN)

5

fractures where on the scaphoid bone are at higher risk of AVN?

the more proximal the fracture the higher the likelihood AVN

6

common mechanism of injury for scaphoid fracture

trauma

7

clinical features of scaphoid fractures

sudden wrist pain
may be bruising
tenderness in flood of anatomical snuffbox
pain on palpating scaphoid tubercle
pain on telescoping of the thumb

8

what is another differential for pain on telescoping of the thumb?

osteoarthritis of the 1st metacarpal base

9

DDx for scaphoid fractures

distal radius fracture
alternative carpal bone fracture
fracture of base of 1st metacarpal
ulnar collateral ligament injury
wrist sprain
De Quervains tenosynovitis

10

what investigations are done for a ?scaphoid fracture?

plain radiograph - scaphoid series - AP, lateral and oblique views

11

is a fracture always detected on initial radiographs?

no - especially when they are undisplaced
if there is sufficient clinical suspicion patient should have wrist immobilised in a thumb splint and repeat plain radiographs in 10-14 days

12

what is done when the repeat imaging is negative but clinical findings are still in keeping with scaphoid fracture?

MRI scan of the wrist - definitive investigation
interim treatment is as for a fracture

13

how are undisplaced scaphoid fractures managed?

strict immobilisation in plaster with spica thumb splint
Undisplaced fractures of proximal pole have high risk of AVN and surgical treatment may be advocated - particularly if dominant hand of working-age patient

14

how are displaced fractures managed?

fixed operatively
percutaneous variable-pitched screw placed across the fracture site to compress it

15

complications of scaphoid fractures

AVN - 30% of cases - especially proximal
non-union - failing to heal properly most commonly due to poor blood supply

16

what happens to scaphoid fractures which are undiagnosed of inappropriately managed?

common
managed with internal fixation and bone grafts