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Shoulder Flashcards

1
Q

4 components of shoulder complex

A
  1. scapulothoracic
  2. sternoclavicular
  3. acromioclavicular
  4. glenohumeral
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2
Q

the clavicle’s anterior surface is _____ medially and ______ laterally

A

convex; concave

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3
Q

orientation of glenoid fossa + name

A

anterolateral; scapular plane

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4
Q

term to measure elevation of arm in scapular plane

A

scaption

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5
Q

which direction does the humeral head face?

A

medially and superiorly

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6
Q

angle of inclination of humerus

A

135º

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7
Q

retroversion angle of humerus

A

30º

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8
Q

joint type of SC

A

synovial

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9
Q

how many clavicular DOF? what are they?

A

3
elevation/depression
protraction/retraction
ant/post rotation

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10
Q

what happens to the clavicle when the shoulder is abducted?

A

posterior rotation, retraction and elevation

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11
Q

arthrokinematics for elevation/depression of clavicle

A

convex clav on concave stern

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12
Q

arthrokinematics for pro/retraction of clavicle

A

concave on convex

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13
Q

retraction = ____ glide

A

posterior

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14
Q

protraction = _____ glide

A

anterior

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15
Q

explain clavicular rotation

A

rotates posteriorly with abduction/flexion; returns to orig position with arm returning to neutral

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16
Q

joint type of AC

A

plane synovial joint

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17
Q

conoid lig prevents _________

A

superior translation

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18
Q

trapezoid lig prevents __________

A

acromion from sliding underneath the clavicle

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19
Q

coracoacromial lig’s role

A

stability

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20
Q

DOF at AC joint - what are they?

A

3
up/down rotation
IR/ER
ant/post tilt

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21
Q

motions at AC joint are __________ movements

A

fine tuning

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22
Q

shoulder ROM is largely attributed to _______________

A

scapulothoracic movement

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23
Q

unique thing about ST joint

A

not a true joint, an articulation

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24
Q

DOF of ST joint and what are they?

A

3
elevation/depression
retraction/protraction
down/upward rotation

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25
how much of shoulder's flexion/abduction ROM does full upward rotation at STJ account for?
1/3 of total
26
what type of joint is GHJ?
synovial, ball and socket
27
primary goal of GHJ
position hand in space
28
GHJ: anatomical sacrifice of _________ for _________
stability; mobility
29
describe the slack/tautness of the GH capsule
slack: anterior and inferior taut: superiorly
30
purpose of the labrum
provide depth to fossa; increase contact area and provide stability
31
2 ligs of GHJ
GH capsular ligaments, coracohumeral lig
32
muscles that stabilize GHJ
rotator cuff, long head of biceps
33
what is the rotator interval?
area between supraspinatus and subscap - biceps tendon and coracohumeral lig are here fig 5-26
34
what forms the coracoacromial arch?
coracoacromial lig and acromion process
35
4 things that live inside the subacromial space
1. supraspinatus 2. subacromial bursa 3. long head of biceps 4. part of superior capsule
36
subacromial bursa location
above supraspinatus, below acromion process
37
lateral extension of the subacromial bursa
subdeltoid bursa
38
function of subdeltoid bursa
limits friction forces between deltoid and supraspinatus
39
normal GH flexion ROM
0-120º 0-180º w scapular rotation
40
normal extension ROM
0-50/60º
41
normal GH abduction ROM
0-120º 0-180º w scap rotation
42
why is abduction usually accompanied by ER?
to clear greater tubercle from getting jammed against subacromial contents
43
normal IR/ER ROM
IR: 0-70/90º ER: 0-90º
44
why can we not use convex/concave rules on GH joint?
muscle contractions stabilize head of humerus in glenoid
45
ratio of scapulohumeral rhythm
2:1 humerus to scap
46
toward end abduction range, contribution is primarily _________
scapulothoracic
47
what two movements contribute to ST upward rotation?
SC elevation | AC upward rotation
48
the clavicle ______ at the SCJ during abduction
retracts
49
the scap ________ and ________ during full shoulder abduction
posteriorly tilts and externally rotates
50
the GH joint _______ during abduction
ER
51
what two parties must coordinate for normal shoulder function?
proximal stabilizers and distal mobilizers
52
5 ST elevators
1. traps 2. post deltoid 3. levator scap 4. rhomboid minor 5. rhomboid major
53
4 ST depressors
1. lower trap 2. lats 3. pec minor 4. subclavius
54
ST protractor
serratus anterior
55
3 ST retractors
1. middle trapezius 2. rhomboids 3. lower trap
56
3 groups of muscle that get arm overhead
1. GH flexors and abductors 2. scap upward rotators 3. rotator cuff
57
2 GH abductors
delt (ant and middle) | supraspinatus
58
3 GH flexors
ant delt, coracobrachialis, LH biceps brachii
59
3 scap upward rotators
1. serratus 2. upper trap 3. lower trap
60
middle trap's role in scap upward rotation
counter's SA tendency to protract
61
most effective upward rotator
lower fibers of SA
62
_______ direct arthrokinematics at GH
rotator cuff muscles
63
5 GH adductors and extensor s
1. post delt 2. lats 3. teres major 4. LH triceps 5. sternocostal head pec major
64
5 GH internal rotators
1. subscap 2. ant delt 3. pec major 4. lats 5. teres major
65
3 external rotators
1. infraspinatus 2. teres minor 3. post delt
66
loss of ST motion may result in......
1/3 of abd/flexion passively, loss of active motion b/c of delt insufficiency (may cause impingement)
67
loss of ST motion's affect on delt
active insufficiency bc it shortens moment arm
68
loss of GH motion results in....
hypermobility at ST joint
69
loss of SC motion causes (2)
1. reduction in ST motion | 2. hypermobility at AC
70
loss of AC motion causes ......
hypermobility at SC joint

Kines (13 decks)

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