Elbow anatomy

Question 1

Elbow osteokinematics

Answer 1

FLX, EXT

Pron, Sup

Question 2

HU joint arthrokinematics

Answer 2

sliding ulna on trochlea into olecranon process with EXT

with FLX, trochlear ridge of ulna slides along trochlear groove until ulnar coronoid process reaches the floor of the coronoid fossa of humerus

Question 3

HR joint arthrokinematics

Answer 3

concave radius head slides post on convex surface of capitulum during EXT

with FLX, concave radius head slides anteriorly in capitulotrochlear groove t enter the radial fossa with flexion

Question 4

Elbow joint capsular pattern

Answer 4

FLX > EXT

Equal pron/sup

Question 5

Superior and inferior radioulnar joint arthrokinematics

Answer 5

Superior-head of radius spins in annular lig, post with pronation and ant with supination

Inferior- concave ulnar notch on radius slides over the ulnar head and articulates with disc: radius slides in same direction as motion

Question 6

Elbow joint ROM

Answer 6

elbow FLX- 0 to 150 deg, soft end feel

supination- 0 to 80 deg, firm end feel

prone

Question 7

Ulnohumeral (trochlear) joint

Answer 7

uniaxial inge joint

resting-70 deg elbow FLX, 10 deg SUP

closed packed- EXT with SUP

capsular- FLX, EXT

Question 8

radiohumeral joint

Answer 8

uniaxial hinge joint

resting-full EXT and full SUP

close packed- elbow FLX to 90 deg, forearm SUP to 5 deg

caps pattern- FLX, EXT, SUP, PRON

Question 9

superior radioulnar joint

Answer 9

uniaxial pivot joint

held by annular ligament

resting- 5 deg SUP

Caps pattern- equal SUP and PRON