elbow and radioulnar joints

Question 1

what types of joints are in the elbow joint

Answer 1

hinge and pivot joints

Question 2

what are the 2 joints called of the elbow complex

Answer 2

• elbow joint

- proximal radioulnar joint

Question 3

what are the 2 processes at the distal end of the humerus called?

Answer 3

trochlea

capitulum

Question 4

what is the part of the ulnar that articulates with the trochlea of the humerus

Answer 4

coronoid process

Question 5

is the olecranon process on the radius or ulnar

Answer 5

ulnar

Question 6

what are the 3 ligaments of the elbow joint

Answer 6

lateral collateral ligament
medial collateral ligament
annular ligament

Question 7

what is special about the lateral collateral ligament of the elbow

Answer 7

it fuses with the annular ligament (does not attach to radius)

Question 8

function of the collateral ligaments of the elbow joint

Answer 8

resists abduction and adduction

Question 9

function of the lateral collateral ligament and the annular liagment

Answer 9

allows pronation and supination

Question 10

which ligament is stronger? Lateral or medial collateral ligaments

Answer 10

medial

Question 11

when do you get valgus angulation of the foream

Answer 11

in complete extension

Question 12

what is cubitus valgus

Answer 12

more lateral displacement of the forearm relative to the humerus –> puts stretch on the medial aspect - can stretch the medial collateral ligament and the ulnar nerve

Question 13

what is between the ulnar and radius

Answer 13

interosseous membrane

Question 14

what is at the inferior aspect of the radio-ulnar joint

Answer 14

triangular fibrocartilage complex

Question 15

functions of interosseuos membrane between ulnar and radius

Answer 15

• links 2 sets of joints

- transmits forces from radius to ulna

Question 16

what are the pronator and supinator muscles of the forearm

Answer 16

Pronators:
- pronator teres
- pronator quandratus
Supernators:
- supernator
- long head of biceps

Question 17

which bone do the pronator and supinator muscles of the forearm attach to?

Answer 17

radius

Question 18

what causes pulled elbow

Answer 18

upwards pull on extended arm pulls radial head out of anular ligament

Question 19

what causes Volkmanns ischaemia

Answer 19

stretch and spasm of brachial artery

Question 20

which direction is the most common dislocation of the elbow

Answer 20

posteriorly

Question 21

what is the most common fracture associated with posterior dislocation of the elbow

Answer 21

fracture of coronoid process

Question 22

what causes tennis elbow

Answer 22

tendinitis of wrist extensor muscle (extensor carpi radialis brevis)

Question 23

which fracture of the elbow joint makes the ulnar nerve susceptible to injury

Answer 23

fracture of medial epicondyle