UE specific joints- shoulder

Question 1

what articulations (4) form the shoulder complex?

Answer 1

glenohumeral joint
sternoclavicular joint
acromioclavicular joint
scapulothoracic articulation

Question 2

loose packed position

Answer 2

position in which joint surfaces are least congruent/where surfaces are least touching and the surrounding ligaments/capsule are lax/least stable , allowing for the most accessory mobility/movement

used for joint mobs

Question 3

close packed position

Answer 3

position in which joint surfaces are most congruent/where surfaces are maximally touching and the surrounding ligaments/capsule are maximally taut/most stable , allowing for the most joint stability

typically occurs at end ROMs

Question 4

what structures is the glenohumeral joint formed by?

Answer 4

head of the humerus
glenoid fossa of the scapula

Question 5

within the GHJ, the head of the humerus is __ in shape and the glenoid fossa of the scapula is __ in shape?

Answer 5

convex; concave

Question 6

what kind of joint is the humerus? how many degrees of freedom does this joint have?

Answer 6

ball and socket synovial joint with 3 degrees of freedom

Question 7

is the GHJ an inherently stable or unstable joint? why?

Answer 7

it is inherently unstable because of the size of the humeral head relative to the small articular surface of the glenoid fossa of the scapula

Question 8

what is the GHJ capsular pattern?

Answer 8

external/lateral rotation
abduction
internal/medial rotation

Question 9

what is the GHJ loose packed position?

Answer 9

55 deg abduction
30 deg horizontal adduction

Question 10

what is the GHJ closed packed position?

Answer 10

external/lateral rotation
abduction

Question 11

what are the osteokinematic motions of the GHJ joint

Answer 11

flexion
extension
abduction
adduction
ER/IR

Question 12

what structures is the sternoclavicular joint formed by?

Answer 12

medial end of the clavicle
manubrium of sternum

Question 13

what kind of joint is the sternoclavicular joint? how many degrees of freedom does this joint have?

Answer 13

saddle shaped synovial joint with 3 degrees of freedom

Question 14

is the sternoclavicular joint an inherently stable or unstable joint? why?

Answer 14

a fibrocartilaginous disc b/t the manubrium and clavicle enhances the stability of the joint

Question 15

what sits b/t the manubrium and clavicle and enhances the stability of the joint

Answer 15

a fibrocartilanginous disc

Question 16

what is the function of the fibrocartilaginous disc b/t the manubrium and clavicle?

Answer 16

acts as a shock absorber and serves as the axis for clavicular rotation

Question 17

what is the sternoclavicular joint capsular pattern?

Answer 17

pain at extremes of range of movement

Question 18

what is the sternoclavicular joint loose packed position?

Answer 18

arm resting by the side

Question 19

what is the sternoclavicular joint close packed position?

Answer 19

maximum shoulder elevation

Question 20

what are the osteokinematic motions of the sternoclavicular joint?

Answer 20

elevation
depression
protraction
retraction
rotation

Question 21

what structures is the acromioclavicular joint formed by?

Answer 21

acromion process of scapula
lateral end of clavicle

Question 22

what kind of joint is the AC joint? how many degrees of freedom does this joint have?

Answer 22

plane synovial joint with 3 degrees of freedom

Question 23

what is the function of the AC joint?

Answer 23

to maintain the relationship between the scapula and clavicle during GHJ ROM

Question 24

what joint functions to maintain the relationship between the clavicle and scapula during GHJ ROM?

Answer 24

the AC joint

Question 25

what is the AC joint capsular pattern?

Answer 25

pain at extremes of range of movement

Question 26

what is the AC joint loose packed position?

Answer 26

arm abducted to 90 deg

Question 27

what are the osteokinematic motions of the AC joint?

Answer 27

anterior tilt posterior tilt upward rotation downward rotation protraction retraction

Question 28

what structures is the scapulothoracic articulation formed by?

Answer 28

the body of the scapula muscles covering the posterior chest wall

Question 29

what does the movement within the scapulothoracic articulation consist of?

Answer 29

sliding of the scapula on the thorax

Question 30

why is the scapulothoracic articulation not considered a true anatomical joint?

Answer 30

it lacks the necessary synovial joint characteristics