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DPT Biomechanics II > Shoulder > Flashcards

Shoulder Flashcards

1
Q

Scapular winging is

A

internal rotation

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2
Q

Scapulohumeral Rhythm
Scapula motion
GH motion

A

60 degrees

120 degrees

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3
Q

as you upward rotate with scap what happens to the AC joint

A

upward rotation

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4
Q

What three things occur at the SC Joint when you raise your arm

A

retracts, posterior rotates, elevation

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5
Q

When raising your arm above the head what are the arthrokinematics at the SC during elevation of the clavicle

A

Elevation of clavicle as (convex) articular surface rolls superiorly and simultaneously slides inferiorly on concave sternum

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6
Q

rotator cuff fails to cover 2 regions of capsule

A 
inferior
rotator interval (between supraspinatus and subscapularis
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7
Q

Approximately 50% of overall depth of glenoid fossa is do to the

A

labrum

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8
Q

a negative intracapsular pressure if impacted will affect

A

stability

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9
Q

What are static constraints

A

ligaments of the shoulder

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10
Q

superior glenohumeral ligament helps to resist

A

inferior subluxation

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11
Q

What ligament of the shoulder resists anterior subluxation

A

middle glenohumeral ligament

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12
Q

What are the three components of the inferior glenohumeral ligament

A

ant and sup band
posterior band
axillary pouch

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13
Q

What is the chief restraint for translation

A

inferior glenohumeral ligament

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14
Q

coracohumeral ligament resists

A

inferior subluxation

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15
Q

arthrokinematics of sternoclavicular jt

A

elevation of clavicle rolls superiorly and slides inferiorly on sternum (convex on concave)

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16
Q

scapulohumeral rhythm

A

120 degrees from GH; 60 from ST

GH moves first then scapula kicks in

17
Q

what is the significance of the ST at 120 degrees of GH abduction

A

clears the greater tubercle of humerus from acromion process by externally rotating

18
Q

what are the 6 kinematic principles of full shoulder abduction

A

scapulohumeral rhythm (upward rotation of ST)
elevation of SCand upward rotation of AC
clavicle retracts at SC joint (15 degrees)
clavicle posteriorly rotates and elevates
scap posteriorly tilts and exterally rotates at full abduction
GH externally rotates

19
Q

what are the upward rotator muscles

A

serrates anterior and upper and lower traps

20
Q

arthrokin of external rot at shoulder

A

posterior roll and anterior slide

21
Q

arthrokin of abduction

A

superior roll, inf slide

22
Q

what are the static tissues that deepen the GH joint

A

joint capsule and ligaments
coracohumeral ligaments
glenoid labrum

23
Q

dynamic tissues that deepen GH joint

A

rotator cuff muscles, long head of biceps brachii

24
Q

what drives superior roll of humerus

A

supraspinatus

25
Q

what drives compression of humerus on glenoid fossa

A

supraspinatus

26
Q

externally rotates humerus

A

infraspinatus and teres minor

27
Q

flexion of the arm

A

anterior delt, coracobrachialis, long head of biceps

28
Q

abduction of the arm

A

deltoids and supraspinatus

29
Q

upward rotation of the scap

A

serratus anterior, trapezius

30
Q

the joint capsule of the shoulder is a ______ membrane and _____ capsule, reinforced by ____

A

synovial, fibrous, external ligaments

31
Q

what does a negative intracapsular pressure bring to the joint capsule of the shoulder

A

stability

32
Q

superior GH ligament

A

resists inferior subluxation, taut with adduction

33
Q

middle gh ligament

A

resist anterior subluxations, taught with ext rot (45-60 degrees)

34
Q

inferior gh ligament

A

greatest thickness; taut with abduction of 90 degrees

35
Q

the inferior gh lig has three bands

A

ant-taut with full er
post-taught with full ir
superior

36
Q

strongust dynamic constraint

A

anterior band

37
Q

coracohumeral ligament

A

inferior subluxation, taut with adduction

limits er below 60 degrees abduction.

38
Q

what is stressed in a baseball pitchers late cocking phase

A

middle GH lig -ER

anterior bad - abduction

DPT Biomechanics II (7 decks)

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