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OPTIM OCS: UQ > Shoulder Complex > Flashcards

Shoulder Complex Flashcards

1
Q

How many muscles attach to the scapula?

A

17

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2
Q

During R shoulder flexion, what movements occur in the upper thoracic vertebrae?

A
  • extension
  • R rotation
  • R sidebending
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3
Q

During R shoulder flexion, what movement occurs in ribs 1 and 2?

A

depression

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4
Q

During R shoulder flexion, what movement occurs in ribs 4-6?

A

elevation

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5
Q

The humeral head is ___x larger than the glenoid fossa

A

3-4x

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6
Q

The humeral head faces:

A

medial
posterior
superior

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7
Q

Humeral head: angle of inclination

A

130˚

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8
Q

Humeral retroversion:

A

30˚

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9
Q

Strength ratios of IR to ER in the shoulder

A

3 to 2

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10
Q

Women have (%) shoulder strength as men

A

40-65%

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11
Q

Only (%) of all new episodes of shoulder pain presenting in primary care show recovery by 6 months

A

50%

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12
Q

SC joint: degree of mobility

elevation and depression

A

30˚-40˚

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13
Q

SC joint: degree of mobility

rotation

A

40˚-50˚ (with ACJ)

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14
Q

SC joint: degree of mobility

Protraction/retraction:

A

~30˚

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15
Q

This joint is the only true skeletal articulation between the axial skeleton and appendicular upper limb

A

SC joint

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16
Q

SCJ shape, number of articulations

A

saddle shaped

diarthrodial jt

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17
Q

ACJ relies on this for support

A

ligamentous stability

  • superior/inferior AC ligaments
  • coracoclavicular ligaments (conoid/trapezoid)
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18
Q

ACJ mobility:

elevation and depression

A

30˚

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19
Q

ACJ mobility:

rotation

A

40˚-50˚ (with SCJ)

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20
Q

ACJ moves in 3 planes: what are they?

A
  • elevation/depression
  • rotation
  • protraction/retraction
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21
Q

Scapulothoracic joint is this type

A

physiological articulation - no bone on bone connection

22
Q

Scapulothoracic joint: degree of upward rotation

A

60˚

23
Q

Scapulothoracic joint: degree of posterior tilt

A

15-30˚

24
Q

Scapulothoracic joint: degree of ER

A

15-25˚

25
Q

Scapulohumeral rhythm:

ratio of GHJ to STJ motion

A

2:1

120˚ from GHJ, 60˚ from scapula

26
Q

Scapulohumeral rhythm:

Which muscles initiate abduction?

A

deltoid

supraspinatus

27
Q

Scapulohumeral rhythm:

This muscle sucks the scapula against the thorax

A

serratus

28
Q

Scapulohumeral rhythm:

Pure GH motion in this range

A

0-45˚

29
Q

Scapulohumeral rhythm:

From 45-60˚, what occurs?

A
  • humerus slides inferiorly

- scapula begins to move

30
Q

Scapulohumeral rhythm:

This occurs at approximately 75˚

A

humeral ER

31
Q

Scapulohumeral rhythm:

At 110˚ this occurs

A

CC ligament tightens

32
Q

Passive stabilizers of the shoulder

A
  • bony shape
  • glenoid labrum
  • limited joint volume
  • intra-articular pressure
  • capsuloligamentous structures
33
Q

GHJ Capsule: This alone provides little support without

A

other dynamic and static stabilization

34
Q

GHJ Capsule: Capsular strength has this relationship to age

A

inverse:

older pt = weaker capsular tissue

35
Q

GHJ Capsule: Capsular pattern

A

ER > ABD > IR

36
Q

GHJ supporting structures: What are the static stabilizers of the joint?

A
  • superior GH ligament
  • middle GH ligament
  • inferior GH ligament
  • coracohumeral ligament
37
Q

GHJ supporting structures:

Superior GH ligament provides

A

inferior restraint with arm abducted

38
Q

GHJ supporting structures:

middle GH ligament provides restraint to

A
  • anterior translation

- ER

39
Q

GHJ supporting structures:

Inferior GH ligament composed of these bands

A

anterior

posterior

40
Q

Actions of levator scapulae

A

adduction
downward rotation
elevation

41
Q

rhomboids actions

A
  • adduction

- downward rotation

42
Q

Rhomboids originate where?

A

nuchal ligament and SPs of C7-T5

43
Q

Rhomboids insert where?

A

medial scapular border

44
Q

Upper Trapezius actions

A
  • upward rotation

- elevation

45
Q

Serratus anterior actions

A
  • holds scapula against ribcage
  • upward rotation
  • posterior tilt
46
Q

Serratus anterior couples with this muscle for elevation

A

trapezius

47
Q

Patients with impingement have shown:

decreased levels of ___ activity

A

serratus anterior

48
Q

Patients with impingement have shown:

delay in firing of these muscles

A

middle/lower trapezius

49
Q

Patients with impingement have shown:

dominance of these muscles resulting in a faulty scapuloumeral rhythm pattern

A
  • UT

- LT

50
Q

RTC muscles

A
  • supraspinatus
  • infraspinatus
  • subscapularis
  • teres minor
51
Q

If the long head of the biceps is torn, will have decreased ability with these movements

A
  • elbow flexion
  • supination
  • shoulder abduction
52
Q

Long head of the biceps has a significant role in ____ shoulder stability

A

anterior

OPTIM OCS: UQ (17 decks)

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