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Z Sem 2 Kines Shoulder/Elbow > Shoulder-elbow kines - Sheet1 > Flashcards

Shoulder-elbow kines - Sheet1 Flashcards

1
Q

sc motion during arm elevation

A

predominantly rotation, then retraction then a little elevation, more retraction in abduction than flexion

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2
Q

acromioclavicular ligament

A

prevent separation of clavical and acromion

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3
Q

coracoclavicular ligaments

A

don’t cross joint; stabilize AC joint but doesn’t cross it; important for quadraped and upward rotation. Couples numeral elevation and scapular upward rotation, coracoid process moves down causing ligament to be taut, clavicle pulled into post rotation which allows further upward rotation of scapula

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4
Q

main AC joint motion during arm elevation

A

posterior tilt > upward rotation >internal rotation

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5
Q

scapular internal rotation with arm elevation

A

internal rotation increases then decreases especially with flexion

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6
Q

normal scapular postion at end range elevation

A

10-20 deg internal rotation; 10 deg post tilt; minimal elevation; acromion at C6-7; minimal abduction

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7
Q

subacromial space size

A

10mm arm at side; 5mm arm elevated

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8
Q

humeral retroversion

A

normal adult 30 deg; greater birth-4 years; adult values by age 19; increased retroversion in throwers

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9
Q

glenoid fossa orientation

A

lateral and 5 deg upward tilt

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10
Q

GH joint closed packed position

A

abduction and lateral rotation

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11
Q

superior glenohumeral ligament

A

taut in full adduction>lateral rotation with arm at side; limit anterior and inferior glide

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12
Q

middle glenohumeral ligament

A

limit external rotation and anterior translation from 0-60 deg abduction

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13
Q

inferior glenohumeral ligament

A

major contributor to joint stability; all fibers in tension >45 deg abduction to limit inferior glide; anterior band limits external rotation; posterior band limits internal rotation

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14
Q

coracohumeral ligament

A

from coracoid process to greater tubercle; taut with adduction/lateral rotation in both flexion and extension; restricts inferior displacement and posterior glide in flexion

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15
Q

rotator interval contents

A

superior GH ligament; CH ligament; long head of biceps tendon

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16
Q

posterior GH capsule

A

limits flexion/horizontal adduction/medial rotation

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17
Q

GH stability <90deg elevation

A

mostly from rotatator cuff muscles

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18
Q

GH flexion

A

120 deg

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19
Q

GH extension

A

55 deg

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20
Q

GH abduction

A

120 deg

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21
Q

GH horizontal adduction

A

45 deg

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22
Q

GH internal rotation

A

70 deg

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23
Q

GH external rotation

A

arm abducted 90 deg; arm at side 70 deg

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24
Q

position in which supraspinatus fibers have best mechanical advantage

A

scapular plane elevation

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25
humeral motion in gleniod
less glide during active vs. passive movement
26
humeral spinning arthrokinematics
occurs with flexion and ER/IR when arm 90 deg abducted
27
scapular static alignment
vertebral border vertical and 3 inches from spine; 10-15deg ant tilt; 30-40 deg internal rotation; resting between T2-T7
28
clavicle static alignment
slight upward slope; 20 deg retraction
29
capsular pattern of restriction
lost: external rotation>abduction>internal rotation
30
humeral movement
no scapular motion during rotation; some LR with abduction and flexion; should not see superior glide
31
best scapular upward rotator and posterior tilter
serratus anterior
32
GH closed packed position
abduction and lateral rotation
33
GH resting position
slight elevation in scapular plane
34
upper trap actions
retract and elevate clavicle; acts on SC joint; balances forces to allow normal scapular upward rotation
35
middle trap actions
act on AC joint; externally rotate and adduct scapula
36
lower trap actions
acts on AC joint; twice the external rotator as mid trap; upward rotator early in range; depress scapula
37
force "couple" for scapular upward rotation
trap and serratus anterior
38
rhomboid actions
adduction; elevation; external rotation; downward rotation; prime stabilizer during humeral movement below 90 deg; usually stronger than traps since used more often
39
levator scap actions
similar to rhomboids plus slight anterior tilt
40
main deltoid action
abduction; small moment arm lower than 45 deg (supraspinatus better abductor at beginning of range)
41
rotator cuff and deltoid force couple
rotator cuff offsets superior force of deltoid vector
42
arm in abduction; moment arm of supraspinatus favors _______
external rotation
43
Supraspinatus moment arm for abduction decreased with humeral __________ rotation
internal
44
arm in flexion; supraspinatus becomes_____ rotator
internal
45
infraspinatus and teres minor functions
lateral rotation; some abduction
46
all lateral rotators
infraspinatus; teres minor; posterior deltoid
47
when does subscapularis have longest moment arm for humeral internal rotation?
arm in abduction or flexion
48
how to isolate subscapularis?
work in end range internal rotation with shoulder in abduction
49
empty can vs. full can
shorter moment arm with empty can so higher forces are needed; reduced subaromial space; full can often better/less painful for patients
50
all medial rotators
subscap(**** best control); teres major; lats; pec major; anterior deltoid
51
key active muscles during push up off wall
serratus anterior; traps and rhomboids; pec major; triceps; rotator cuff
52
elbow capsular pattern
flexion loss greater than extension loss
53
elbow closed packed position
ulnohumeral extension; radiohumeral flexion; proximal radioulnar supination
54
radial head oblique shape
larger diameter anterior to posterior
55
ligament most important for valgus stability
anterior MCL
56
pronation rom
75 deg
57
supination ROM
85 deg
58
screw home mechanism of elbow
pronation and flexion increases contact of radius on capitulum; ulnar structures compressed at wrist
59
axis of proximal RU joint movement
head of radius to head of ulna; motion rolling without sliding
60
oblique cord
taut with supination
61
distal RU joint closed packed position
neutral to 5deg supination
62
DRUJ articular surfaces
ulna convex; radius concave
63
axis for forearm rotation
through 3rd metacarpal
64
position where elbow flexors produce max torque
90deg
65
during elbow flexion the _______ extends shoulder acting as synergist to allow biceps to function at optimal length
posterior deltoid
66
best position for elbow extension
20-30 deg flexion

Z Sem 2 Kines Shoulder/Elbow (2 decks)

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