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MSK > Shoulder Anatomy > Flashcards

Shoulder Anatomy Flashcards

1
Q

SH Rhythm: Phase 1, part 1

A

0-30deg

GH contributes all motion, scapula does nothing

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2
Q

SH Rhythm: Phase 1, part 2

A

30-90deg
GH contributes 30
Scapula contributes 30

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3
Q

SH Rhythm: Phase 1, part 2 scapula motion is…

a) SC > AC
b) AC > SC

A

a) SC > AC

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4
Q

SH Rhythm: Phase 2 scapula motion is…

a) SC > AC
b) AC > SC

A

b) AC > SC

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5
Q

SH Rhythm: Phase 2

A

90-180deg
GH contributes 60
Scap contributes 30

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6
Q

SH Rhythm: overall, what is the ratio of GH:ST motion?

A

2:1

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7
Q

Phase 1: what scapula motions?

A

elevation
up rotation
post tipping
ER

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8
Q

At 90deg, why is GH ER important?

A

If no ER = jt would “lock” bc greater tub against acromial arch.
ER allows greater tub to clear arch.

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9
Q

Max elevation of GH frozen

A

60deg

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10
Q

Max elevation if no GH ER

A

90deg

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11
Q

CT contribution for unilateral elevation

A

last 10-20deg

contralat side bend

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12
Q

CT contribution for bilateral elevation

A

last 10-20deg

extension

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13
Q

Rhomboids action

A

Concentric: down rotates scap.
Eccentric: controls up rotation (generated by concentric action of Trap & Serratus Ant).

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14
Q

Upper trap is coupled with ____ Serratus Anterior

A

Lower

and vice versa

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15
Q

RC muscles are most active at _____deg elevation

A

0-115

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16
Q

painful arc SIS

A

60-120

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17
Q

painful arc AC

A

170-180

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18
Q

resting position of scapula

A

ribs 2-7
10-20deg ant tip
10-20deg up rotated
30-40deg IR

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19
Q

how is the resting position of the scapula affected with fwd head posture?

A

Scap down rotated
Slack on sup GH capsule
less flex ROM
RC musc contract to maintain jt integrity

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20
Q

causes of scap dyskinesis

A

musc weakness/imbalance
nerve, AC, or RC injury
sup labral tear

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21
Q

Anterior tip: what does it look like?

A

inf angle more prominent.

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22
Q

Anterior tip: weak muscles

A

lower trap
lats
serr ant

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23
Q

Anterior tip: tight muscles

A

pecs

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24
Q

Winging: what does it look like?

A

med border more prominent.

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25
Q

Winging: weak muscles

A

traps
rhomboids
serr ant

26
Q

Winging: tight muscles

A

humeral rotators

27
Q

Winging: other injuries that may cause it

A

SLAP

long thoracic nerve lesion

28
Q

Elevated scapula: what does it look like?

A

sup angle elevated.

29
Q

Elevated scapula: muscles involved

A

Overactive levator & upper trap.

Imbalanced up/low trap force couple.

30
Q

Elevated scapula commonly seen w/ what conditions?

A

SIS

RC lesions

31
Q

SC frontal plane motions

A

elevation (45)

depression (15)

32
Q

SC frontal plane: what is convex/concave?

A 
vex = clavicle
cave = manubrium
33
Q

SC transverse plane motions

A

protraction (15)

retraction (15)

34
Q

SC transverse plane: what is convex/concave?

A 
vex = manubrium
cave = clavicle
35
Q

SC sagittal plane motions

A

upward rotation (30-45)

36
Q

AC ligaments

A

Coracoclavicular (Trapezoid & Conoid)
Acromioclavicular
Capsule

37
Q

trapezoid lig checks what motion?

A

lateral movement of clavicle

38
Q

conoid lig checks what motion?

A

superior movement of clavicle (upward rotation)

39
Q

AC joint movements (and named for what?)

A

Ant/post tipping: direction of acromion
IR/ER: direction of glenoid
Up/down rotation: direction of glenoid

40
Q

HH faces what directions in anatomic position?

A

medial
posterior
superior

41
Q

Glenoid faces what directions in anatomic position?

A

lateral
anterior
superior

42
Q

Orientation of glenoid/HH provides the most stability where?

A

posterior

inferior

43
Q

GH joint capsule fiber pattern & purpose

A

Cross-liked pattern = tightens w/ ER/IR forces

44
Q

GH Close-Pack position

A

full ABD

full ER

45
Q

GH resting position

A

55 ABD

30 horiz ADD

46
Q

GH lig: transverse humeral

A

holds BLH tdn in groove

47
Q

GH lig: coracohumeral

A

stabilizes BLH tdn

provides inf stability from 0-50° ABD (w/ SGHL).

48
Q

GH lig: coracoacromial

A

superior stability

49
Q

SGHL stability

A

provides inferior stability
limits inferior translation of HH
0-50 ABD

50
Q

MGHL stability

A

provides anterior stability
limits anterior translation of HH
45-60 ABD
limits ER (from 0-90 ABD)

51
Q

IGHL anterior band

A

limits ant/inf translation at 90° ABD & ER

52
Q

IGHL posterior band

A

limits post translation with ABD & IR

53
Q

IGHL axillary pouch

A

like a hammock
supports HH in ABD.
ABD + ER = resists ant dislocation.
ABD + IR = resists post dislocation.

54
Q

what is the rotator interval

A

Ant/sup space btwn subscap & supraspin tdns

55
Q

contents of rotator interval

A

CHL
SGHL
BLH tdn
ant jt capsule

56
Q

purpose of rotator interval

A

stability to GH & BLH tdn

limits excessive GH motion

57
Q

contracture of rotator interval may lead to…

A

adhesive capsulitis

58
Q

laxity of rotator interval may lead to…

A

GH instability

59
Q

labrum purpose

A

deepens fossa by ~50%, increase surface area for HH.
Allows GH lig attachments to glenoid.
Limits HH translation.

60
Q

labrum blood supply

A

only to periphery

cannot heal on its own without surgery

61
Q

bursa purpose

A

alleviate friction by creating space btwn 2 tightly opposed structures

62
Q

T/F: bursa cannot be strengthened/stretched

A

TRUE

non-contractile tissue

MSK (8 decks)

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