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functional anatomy > GH Joint > Flashcards

GH Joint Flashcards

1
Q

Resting position of GH joint

A

55 ABD
30 Horiz ADD
Slight ER

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2
Q

CPP of GH jt

A

Max ABD and ER

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3
Q

Capsular pattern of GH jt

A

ER>ABD>IR

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4
Q

During Flexion the GH joint works for how many degrees?

A

120 degrees of movement

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5
Q

Prime Flexion movers

A

Ant delt
Pec major (clavicular head)
Coracobrachialis
Biceps brachii

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6
Q

Extension of GH degrees

A

65 degrees

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7
Q

Prime extension movers of GH

A

Post delt
Teres major
Lat Dorsi
Long head of triceps
Pec major (sternocostal part)

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8
Q

Abduction GH joint

A

(When in ER) 120 degrees

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9
Q

Abduction prime movers

A

Supraspinatus
lat delt

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10
Q

Adduction GH joint

A

0 pure adduction at side
50-75 degrees in front of body

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11
Q

Adduction prime movers

A

Post delt
Ant delt
Pec major
Long head of triceps
Coracobrachialis
Teres major
Lat dorsi

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12
Q

Extemal rotation In GH joint

A

60-70° of pure ER
ER increases to 90 when shoulder is ABD

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13
Q

External rotation prime movers

A

Post delt
Teres minor
Infraspinatus
Supraspinatus (between neutral and full ER)

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14
Q

Internal rotation of GH

A

75° - 85° of pure IR

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15
Q

Internal rotation prime movers

A

Anterior deltoid
Pectoral major
Teres major
lat dorsi
Subscapularis

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16
Q

Variables that determine the pattern of movements within the fossa

A

Articular geometry
Capsuloligamentous influences
Positional influences
Muscle dynamics

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17
Q

Stabilizing structures of the GH

A

Rotator cuff muscle
Capsule
GH ligaments
Coracohumeral ligament
Coracoacromial arch
Long head of biceps
Glenoid labrum
Negative intra-articular pressure
Compressive forces

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18
Q

Rotator cuff muscles

A

Provide static stability through reinforcement of the capsule
Provide most of the dynamic GH stability

Supra
Infra
Teres minor
Subscap

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19
Q

Capsule

A

It’s loose and expandable
The space was in the capsule. It can be twice the size of the humeral head.
It is lined with synovium

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20
Q

Superior GH ligament

A

Becomes taut when the arm is at the side or with inferior and posterior translation of the humerus

21
Q

Middle GH ligament

A

Restricts an interior translation of the GH and resists ER
Most effective at 45 to 60° of abduction

22
Q

Inferior GH ligament

A

Anterior band: prevent interior translation of the GH with the arm abducted to 90° or greater.
-Strongest and thickest part of the entire capsule

Posterior band: prevent posterior translation of the GH with the arm abducted to 90° or greater

Auxiliary pouch: TAUT in abduction more than 90 degrees

23
Q

Coracohumeral ligament

A

Limits inferior displacement of the GH with arm at the side
Extremes of external rotation, when shoulder is in Adduction

24
Q

Coracoacromial Arch

A

Consist of the coracoid the acromion and the coracoacromial ligament
Prevent the humerus from dislocating superiorly

25
Q

Structures under the coracoacromial arch

A

Rotator cuff tendons
Long head of biceps
Subacromial bursa
Sub deltoid bursa

26
Q

Long head of the biceps

A

An important attachment to the labrum
Role in humeral head, depression
Limiting excessive anterior translation

27
Q

Glenoid labrum

A

Deepens the Glenoid fossa providing increased stability

28
Q

Negative intra-articular pressure

A

Can be lost if the capsule is punctured

29
Q

Compressive forces

A

These forces hold the humeral head in the glenoid fossa
Due to the upward orientation of the scapula, the force of vectors of gravity and the superior GH restraints.

30
Q

Scapular plane

A

The scapula is not fully in the frontal plane. It is 30 to 45° toward the sagittal plane.

31
Q

Scapulohumeral rhythm

A

Rhythm between the GH abduction and scapulothoracic upward is relatively constant and has a ratio of 2 to 1
For every 3° of shoulder abduction 2° occur at the GH while one degree occurs at the ST joint

32
Q

Role of scapular movement

A

Maintains glenoid fossa in optimal position
Allows muscles to maintain good length – tension relationship
Allows for increased ROM

33
Q

SC and AC involvement

A

In the early phase of shoulder abduction, less than 90 degrees, 60% of abduction at the Gleno humeral joint and 30° of scapular rotation.
Of the 30° of scapular rotation:
20 to 25° of clavicular elevation at the SC joint and 5 to 10° of upward rotation of the acromion at the AC joint.

34
Q

SC and AC Involvment in the late phase shoulder ABD more than 90 degrees

A

Of 30 degrees of scap rotation and 60 degrees of ABD at GH
5 degrees clavicular elevation at the SC
20-25 upward rotation at the acromion at the AC joint
40 degrees posterior rotation of clavicle

35
Q

Deltoid anterior

A

Origin: outer 1/3 of the clavicle
Insertion: deltoid tuberosity
Innervation: axillary nerve
Action: ABD, FLEX, MEDROT,HORIZ ABD

36
Q

Lateral deltoid

A

Origin: lateral acromion
Insertion: deltoid tuberosity
Innervation: axillary nerve
Action: ABD

37
Q

Posterior deltoid

A

Origin: spine of scap
Insertion: deltoid tuberosity
Innervation: axillary nerve
Action: ABD, EXT,HORIZ ABD, EXT ROT

38
Q

Pec major clavicular portion

A

Origin: medial 1/3 clavicle
Insertion: lat lip of bicipital groove of humerus
Innervation: lateral and medial pec nerve C5-T1
Action: Flex to 60 deg

39
Q

Pec major sternocostal part

A

Origin: sternum, coral cartilage 1-6
Insertion: lateral lip of bicipital groove of humerus
Innervation: medial and lateral pectoral nerve C5-T1
Action: Ext 180-120 putting arm down from full extension

40
Q

Lat dorsi

A

Origin: T7-L5 spinous processes by dorsilumbar fascia, posterior sacrum, iliac crest and last 3 ribs
Insertion: medial floor of bicipital groove
Innervation: thoracodorsal nerve C6-C8
Action: ADD, MED ROT, EXT

41
Q

Teres major

A

Origin: axillary border, inferior angle of scap, dorsal surface
Insertion: crest lesser tubercle
Innervation: lower subscapular nerve C5-C7
Action: ADD,MED ROT, EXT

42
Q

Supraspinatus

A

Origin: Supraspinous fossa
Insertion: greater tubercle
Innervation: suprascspular nerve C5-C6
Action: ABD, ER

43
Q

Infraspinatus

A

Origin: Infraspinous fossa
Insertion:greater tubercle
Innervation: suprascapular nerve C5-C6
Action : LAT ROT, HORIS ABD

44
Q

Teres minor

A

Origin: axillary border of scap or lateral margin of infraspinous fossa
Insertion: greater tubercle
Innervation axillary nerve
Action: LAT ROT, HORIZ ABD

45
Q

Subscapularis

A

Origin: subscapular fossa
Insertion: lesser tubercle
Innervation: upper and lower subscapular nerve
Action: MED ROT, ADD

46
Q

Coracobrachialis

A

Origin: coracoid process of the scap
Insert: medial surface of humerus
Innervation: musculocutaneous nerve C6-C7
Action: FLEX, ADD

47
Q

Biceps brachii

A

Origin: Long head- supraglenoid tubercle. Short head- coracoid process
Insertion: radial tuberosity
Innervation: musculocutaneous nerve C5-C6
Action: FLEX

48
Q

Triceps brachii

A

Origin: long head- infraglenoid tubercle
Insertion: olecranon process of the ulna
Innervation: radial nerve
Action: EXT

functional anatomy (3 decks)

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