Shoulder Girdle

Question 1

what is the concept of dynamic stability? (mobility and structure)

Answer 1

• greatest mobility of any joint
• not structurally very stable

Question 2

what is the scapular resting position?

Answer 2

• 30 degree scaption plane
• 20 degree anterior tilt

Question 3

describe the structure of the humeral head

Answer 3

30 degree retroversion in line with the scaption plane

Question 4

describe the orientation of the scapula and clavicle

Answer 4

• 30-35 scaption plane
• 20 degree clavicle

Question 5

what would be the result if our humerus didn’t have a 30 degree retroversion?

Answer 5

our curls would be IR 30 deg

Question 6

which joint improves available shoulder ROM

Answer 6

STJ

Question 7

which joint maintains favorable deltoid and RC muscle LT relationships?

Answer 7

STJ

Question 8

which joint provides stability for overhead work and allows for UE shock absorption?

Answer 8

STJ

Question 9

which joint permits elevation of the body with UE weight bearing

Answer 9

STJ

Question 10

how are the scapular motions named?

Answer 10

for the glenoid movement

Question 11

name and describe the disorder that the kid from stranger things has

Answer 11

Cleidocranial Dysplasia/Dysostosis - partially missing clavicle leads to excellent mobility and severely limited stability

Question 12

what is the only joint that truly connects the UE with the thorax? describe the joint

Answer 12

SCJ - strong ligamentous structure causes the clavicle to fx before dislocation of the joint

Question 13

How many degrees of freedom at the SCJ? what are the motions?

Answer 13

3 degrees of freedom

• elevation/depression
• protraction/retraction
• posterior rotation

Question 14

what is the shape of the SCJ?

Answer 14

saddle

Question 15

describe the SCJ arthokinematics of elevation/depression

Answer 15

• convex on concave - sup roll/inf glide
• convex on concave - inf roll/sup glide

Question 16

describe the SCJ arthrokinematics of retraction

Answer 16

concave on convex - post roll/slide

Question 17

what are the two major functions of the ACJ

Answer 17

• key to the alignment of the glenoid
• contributes to scap elevation and up rotation for overhead acts

Question 18

how many degrees of freedom at the ACJ and what are the motions?

Answer 18

3 degrees of freedom

1. up/down rotation
2. IR/ER - horizontal plane
3. A/P tilting - sagittal plane

Question 19

scapular winging is noted in which ACJ movement

Answer 19

IR/ER - horizontal plane movement

Question 20

scapular tipping is noted in which ACJ movement?

Answer 20

A/P tipping - sagittal plane movment

Question 21

describe scapular upward rotation at the SCJ and ACJ

Answer 21

SC elevation and AC up rotation

Question 22

describe scapular elevation at the SCJ and ACJ

Answer 22

SC elevation and AC down rot

Question 23

describe scapular protraction at the SCJ and ACJ

Answer 23

SC protraction and AC IR

Question 24

what are the major scapular elevators?

Answer 24

UT, levator, rhomboids

Question 25

what are the major scapular depressors?

Answer 25

1. low traps and lats 2. pec minor and subclavius

Question 26

what movement helps you push up out of a chair?

Answer 26

scapular depressors reverse action concentric

Question 27

what are the major scapular protractors?

Answer 27

serratus anterior

Question 28

what are the major scapular retractors?

Answer 28

Mid trap, rhomboids, low trap

Question 29

what are the four force coupling muscles that provide scapular upward rotationa and GH abduction?

Answer 29

UT, LT, SA, Delt

Question 30

what are the 5 major force coupling muscles for scapular downward rotation with GH adduction?

Answer 30

rhomboids, lats, teres major, infraspinatus, posterior delt

Question 31

what are the major muscle groups utilized in a seated push up - up phase? (3)

Answer 31

* everything is concentric reverse action * scap depressors * GH flexors * GH adductors

Question 32

what are the major muscle groups utilized in a seated push up - down phase? (3)

Answer 32

* everything is **_eccentric_** reverse action * scap depressors * GH flexors * GH adductors

Question 33

what are the major muscle groups utilized in an up-phase pull up? (5)

Answer 33

* everything is **_concentric_** reverse action * scap retractors * scap down rotators * scap depressors * GH extensors * GH adductors

Question 34

what are the major muscle groups utilized in a down-phase pull up? (5)

Answer 34

everything is **_eccentric_** reverse action 1. scap retractors 2. scap down rotators 3. scap depressors 4. GH extensors 5. GH adductors

Question 35

what are the major muscle groups utilized in a down-phase push up? (4)

Answer 35

everything is **_eccentric_** reverse action 1. scap protractors 2. scap up rotators 3. GH flexors 4. GH horizontal addcutors

Question 36

what are the major muscle groups involved in an up-phase push up? (4)

Answer 36

everything is **_concentric_** reverse action 1. scap protractors 2. scap up rotators 3. GH flexors 4. GH horizontal adductors

Question 37

what are the major muscle groups involved in reaching back for the wheels in a wheel chair? (6)

Answer 37

everything is concentric normal action 1. scap retractors 2. scap downward rotators 3. GH extensors 4. GH IRs 5. GH horizontal abductors 6. GH abductors

Question 38

what are the major muscle groups involved in pushing wheels in a wheel chair? (6)

Answer 38

everything is concentric normal action 1. scap protractors 2. scap upward rotators 3. GH flexors 4. GH ERs 5. GH horizontal adductors 6. GH adductors

Question 39

what are the major muscles involved in advancing crutches? (4)

Answer 39

everything is concentric normal action 1. scap protractors 2. scap upward rotators 3. GH flexors 4. GH horizontal adductors

Question 40

what are the major muscles involved in elevating oneself on crutches without advancement? (3)

Answer 40

everything is concentric reverse action 1. scap depressors 2. GH flexors 3. GH adductors

Question 41

what are the major muscle groups involved in advancement with crutches? (4)

Answer 41

everything is reverse action, but muscle action varies 1. scap retractors - concentric 2. scap depressors - isometric 3. GH extensors - concentric 4. GH adductors - isometric