Function Of Ligaments

Question 0

Posterior MCL

Answer 0

Limits elbow extension, limits valgus

Question 1

Anterior MCL

Answer 1

Resist valgus from 20-120 degrees of flexion
Anterior band up to 90 degrees
Posterior band end range of flexion

Question 2

Oblique MCL

Answer 2

Approximate joint surface so limits distraction

Small role in limiting valgus

Question 3

Lateral collateral ligament

Answer 3

Limits varus, limits varus with supination so radial head doesn’t roll off, stabilize ulna to humerus, limits long axis distraction, stabilizes radial head for rotation

Question 4

Lateral radial collateral ligament

Answer 4

Reinforcement for humeroradial joint, protect against varus forces in some elbow positions, resistance to long distractions

Question 5

Lateral ulnar collateral ligament

Answer 5

Posterolateral stability by securing ulna to humerus

Question 6

Annular ligament

Answer 6

Holds radial head in place

Question 7

Interosseous membrane

Answer 7

Maintains space between radius and ulna during forearm rotation, transfers load from distal radius to proximal ulna, holds two bones together, supports inferior radioulnar joint

Question 8

Quadrate ligament

Answer 8

Maintains position of radius with ulna, might limit pronation and supination

Question 9

TFCC

Answer 9

Tethers ECU, increases stability on lateral side, absorbs forces, increase congruency on ulnar side

Question 10

Palmar radioulnar

Answer 10

Limits supination

Question 11

Dorsal radioulnar

Answer 11

Limits pronation

Question 12

Radioscapholunate

Answer 12

Conduit for neurovascular structures, limit extension

Question 13

Radiolunate and radiocapitate

Answer 13

Limits extension

Question 14

Radial collateral

Answer 14

Resists ulnar deviation

Question 15

Ulnar collateral

Answer 15

Resist radial deviation

Question 16

Ulnolunate

Answer 16

Resist extension

Question 17

Dorsal radiocarpal

Answer 17

Radiocarpal stability, prevent excessive flexion, prevent dorsal glide, stabilize scaphoid

Question 18

Dorsal intercarpal

Answer 18

Radiocarpal stability, stabilize scaphoid