The Shoulder Complex

Question 1

What is the function of motion at the scapulothoracic joint ?

Answer 1

orient glenhoid fossa for optimal contact with the humeral head when mving arm and hand

Question 2

SC Joint

Answer 2

elevation and depression

convex clavicle moves on concave sternum

Question 3

SC elevation

Answer 3

superior roll inferior glide

Question 4

What is the function of the SC disc in reference to SC stability?

Answer 4

disc increases stability by increasing joint congruence and abosrobes forces along clavicle

Question 5

ER glenohumeral

Answer 5

posterior roll anterior glide

Question 6

What is the function of rotator cuff during shoulder elevation ?

Answer 6

functions with deltoid to maintain congruence of the humeral head on the glenhoid

Question 7

Upward rotators of scapula

Answer 7

upper trap, serratus anterior, lower trap

Question 8

downward rotators of the scapular

Answer 8

Rhomboids and lats

Question 9

What does the glenhoid labrum do?

Answer 9

enhances the depth of the glenhoid fossa

Question 10

Scapula in resting position

Answer 10

between 2nd and seventh ribs

IR 35-45 deg from coronal plane

Question 11

what supporting ligament of the GH joint is known as the ligament group?

Answer 11

inferior GH ligament

Question 12

Inferior GH ligament

Answer 12

if shortened can result in excessive superior translation of humeral head and impinge during GH elevation

Question 13

Superior GH ligament

Answer 13

taut when arm is fully adducted

Question 14

Kinematics of GH abd

Answer 14

superior roll inferior glide

Question 15

what muscle is the steerer of the GH joint?

Answer 15

supraspinatus

Question 16

What is the resultant force of the rotator cuff?

Answer 16

slight ER followed by compressive force pulling humeral head into glenhoid fossa

Question 17

Radial (lateral) collateral ligament

Answer 17

resists excessive varus forces

Question 18

ulnar collateral ligament

Answer 18

resists excessive valgus forces

Question 19

end feel of shoulder?

Answer 19

firm

spring block for rotation

Question 20

capsular pattern of shoulder?

Answer 20

ER>abd>IR

Question 21

What is the cellular unit of muscle ?

Answer 21

myofibril

Question 22

open pack position of GH joint

Answer 22

55 abd , 30 horizontal adduction

Question 23

normal anterior scapula tilt

Answer 23

10 to 15 deg and effects acromio clavicular joint

Question 24

what does the word trochlea mean?

Answer 24

spool like

Question 25

GH kinematics IR/ ER

Answer 25

IR anterior roll posterior glide

ER Poseterior roll anterior glide