elbow joint

Question 1

what movements occur at what joint

Answer 1

flexion/extension= elbow joint/ radio-ulnar joint

pronation/supination= proximal SRUJ middle RUJ distal IRUJ

Question 2

describe the elbow joint synovials

Answer 2

humero-ulna joint= synovial hinge

humero-radial joint= synovial modified ball and socket joint

SRUJ= synovial pivot joint

Question 3

describe articulation of elbow joint

Answer 3

elbow joint is a synovial modified hinge joint uniaxial

joint line 2cm below medial epicondyle and 1cm below lateral epicondyle

articulation is convex trochlea of distal humerus articulating with concave trochlea notch of proximal ulna

convex capitulum of distal humerus articulating with concave proximal head of radius

Question 4

whats a carry angle

Answer 4

carry angle 10-15 degrees in men in women is 20-25

medial edge of trochlea projecting distally
disappears full flexion and pronation on extension

Question 5

where does the elbow capulse attach

Answer 5

around edge of ulnar articular surfaces including radial notch

Question 6

what ligaments are there

Answer 6

ulna (medial) collateral ligament=
thick triangular band which fans from medial epicondyle and has anterior, posterior and intermediate portions.
inserts into medial aspect of coronoid process and olecranon

radial collateral ligament= (prevents varus strain)
single triangular thickened band from lateral epicondyle to annular ligament

Question 7

describe olecranon bursa

Answer 7

facilitates smooth movements of skin over olecranon process during flexion/extension

Question 8

describe superior radio-ulna joint

Answer 8

synovial pivot joint

articulation with head of radius and radial notch of ulna

Question 9

describe annular ligament

Answer 9

stabilises proximal RUJ

inferior diameter small

inner surface is lined with fibro cartilage

Question 10

describe quadrate ligament

Answer 10

small ligament arising from inferior border of radial notch to neck of radius

tested by full pronation and full supination

Question 11

describe radio-ulnar interosseous membrane

Answer 11

fibrous joint

syndesmosis

2 layers opposite direction

stabilises radius and ulnar

attachment site for deep muscles

Question 12

describe inferior radio-ulnar joint

Answer 12

synovial pivot joint

articulation is convex lower head of ulna

concave ulnar notch of distal radius