Elbow, Wrist, Hand Ligaments

Question 1

Attachments of ulnar collateral ligament of elbow

Answer 1

medial epicondyle to medial margin of coronoid process & olecranon process

Question 2

Attachments of radial collateral ligament of elbow

Answer 2

lateral epicondyle to annular ligament

Question 3

Attachments of annular ligament

Answer 3

anterior margin of the radial notch to posterior margin of radial notch (surrounds head of radius)

Question 4

Attachments of interosseous membrane

Answer 4

interosseous border of radius to interosseous border of ulna

Question 5

Function of ulnar collateral ligament of elbow

Answer 5

resists excessive cubital valgus
Primary resistor between 20-130° of motion (olecranon process out of fossa = less reliance on osseous structures)

Question 6

Function of radial collateral ligament of elbow

Answer 6

resists excessive cubital varus
primary restraint against posterolateral instability of radial head

Question 7

Function of annular ligament

Answer 7

stabilizes proximal radio-ulnar joint
provides 80% of articular surface of humeral radial joint
maintains relationship between radial head with ulna
permits pronation/supination

Question 8

Attachments of transverse carpal ligament

Answer 8

pisiform & hook of hamate to scaphoid & trapezium

Question 9

Function of transverse carpal ligament

Answer 9

prevents bowstringing of the tendons of the flexor pollicus longus, flexor digitorum superficialis, & flexor digitorum profundus muscles

Question 10

Attachments of radiocarpal ligaments

Answer 10

dorsal and palmar surface of the distal radius to the first 2 rows of carpal bones

Question 11

Function of radiocarpal ligaments

Answer 11

stabilizes carpal bones on radius

Question 12

Attachments of radial collateral ligament of wrist

Answer 12

radial styloid process to scaphoid

Question 13

Function of radial collateral ligament of wrist

Answer 13

restain/limit wrist ulnar deviation

Question 14

Attachments of ulnar collateral ligament of wrist

Answer 14

ulnar styloid process to triquetrum

Question 15

Function of ulnar collateral ligament of wrist

Answer 15

restrain/limit wrist radial deviation

Question 16

Attachments of collateral ligaments of MCP joints

Answer 16

head of metacarpals to base of adjacent proximal phalanx

Question 17

Function of collateral ligaments of MCP joints

Answer 17

stabilizes MCP joints

Question 18

Components of triangular fibrocartilage complex (TFCC)

Answer 18

biconcave fibrocartilage disc
palmar ulnocarpal ligament
ulnar collateral ligament

Question 19

Function of TFCC

Answer 19

-stabilize distal radio-ulnar and ulnocarpal joints
-form concavity on the ulnar side of the wrist
-transfer compressive force from hand/wrist to forearm (ulnar sided force transmission)
- provides dual articular surface

Question 20

3 components of UCL

Answer 20

anterior band, posterior band, transverse/oblique band

Question 21

Anterior band of UCL

Answer 21

strongest & stiffest
taught in terminal extension
secondary restraint at end range flexion beyond 120°

Question 22

Posterior band of UCL

Answer 22

weakest
taut beyond 55° of elbow flexion
secondary restraint to valgus stress at lesser degrees of flexion

Question 23

Transverse/oblique band of UCL

Answer 23

little role in elbow stability
deepens socket of trochlea

Question 24

What band of UCL is more commonly ruptured?

Answer 24

anterior