Radiocarpal joint

Question 1

Blood supply of radiocarpal joint

Answer 1

Branches of dorsal and palmar carpal arches (derived from ulnar and radial arteries)

Question 2

Innervation of radiocarpal joint

Answer 2

Anterior interosseous branch of median nerve,
Deep and dorsal branches of ulnar nerve,
Posterior interosseous branch (off deep branch) of radial nerve

Question 3

What strengthens the radiocarpal joint

Answer 3

Palmar radiocarpal,
Dorsal radiocarpal,
Ulnar collateral,
Radial collateral,
Joint capsule

Question 4

Where is the palmar radiocarpal ligament and what does it do

Answer 4

Palmar side of hand - from radius to carpal bones

Ensures hand follows the forearm during supination

Question 5

Where is the dorsal radiocarpal ligamentum and what does it do

Answer 5

Dorsum of hand - from radius to carpal bones

Ensures hand follows forearm during pronation

Question 6

Where is the ulnar collateral ligament and what does it do

Answer 6

From ulnar styloid process to triquetrum and pisiform

Prevents excessive lateral joint displacement

Question 7

Where is the radial collateral ligament and what does it do

Answer 7

From radial styloid process to scaphoid and trapezium

Prevents excessive lateral joint displacement

Question 8

Movements facilitated by the radiocarpal joint

Answer 8

Flexion,
Extension,
Adduction,
Abduction

Question 9

What forms the radiocarpal joint

Answer 9

Distally: scaphoid, lunate and triquetrum (convex)
Proximally: distal end of radius and articular disk (concave)

Question 10

How does anterior dislocation of lunate occur

Answer 10

Falling on dorsiflexed wrist

Question 11

Risks of anterior lunate dislocation

Answer 11

Can compress carpal tunnel giving symptoms of carpal tunnel syndrome
Avascular necrosis of lunate