Hand and Wrist

Question 1

Where is the scaphoid located?

Answer 1

Anatomical snuffbox

Question 2

Ulnar (Medial) border tendon

Answer 2

Extensor Pollicis Longus

Question 3

2 tendons

Radial (Lateral) border tendon

Answer 3

1. Extensor Pollicis Brevis
2. Abductor Pollicis Longus

Question 4

Anatomical Snuffbox Contents

Answer 4

• Radial Artery
• Radial Nerve
• Cephalic Vein

Question 5

The most common fractured bone in the hand

Answer 5

Scaphoid bone

Question 6

What trauma commonly fractured the scaphoid bone?

Answer 6

Falling on an outstrectched hand (FOOSH)

Question 7

Complication of scaphoid bone fracture

Answer 7

Avascular necrosis (AVN)

Question 8

How does AVN occur on the scaphoid bone?

Answer 8

Retrograde blood supply: blood supply entering from its distal end towards proximal end of the bone
- Fracture can cause blood supply to be “cut-off’ leading to AVN

Question 9

What artery supply blood to the scaphoid bone?

Answer 9

Radial Artery

Question 10

What braches of the radial artery supply blood to the scaphoid bone?

Answer 10

1. Dorsal Scaphoid Branch: Proximal pole of scaphoid (80%)
2. Palmar Scaphoid Branch: Distal pole of the scaphoid

Question 11

What is an ‘occult’ fracture?

Answer 11

A broken bone that is not easily seen on an X-ray

Question 12

Complication of an occult scaphoid fracture

Answer 12

OA of the wrist later in life