Joint Mobs 300: Glenohumeral Joint

Question 0

Approximately degrees of motion and must occur at the shoulder complex for most functional activities to occur.

Answer 0

120 degrees, flexion, abduction

Question 1

What makes up the Shoulder Complex?

Answer 1

Glenohumeral, Sucapulothoracic, Acromioclavicular, Sternoclavicular

Question 2

Glenohumeral jt. Classification is….

Answer 2

Structure: synovial
Function: diarthrotic
Subtype: ball-and-socket
Axis of rotation: multiaxial

Question 3

Osteokinematic motions

Answer 3

Flexion: 180
Extension: 45
Abduction: 180
Addiction: 45
Medial rotation: 70
Lateral rotation: 90
Horizontal addiction: 45
Horizontal Abduction: 100

Circumduction is a combination

Question 4

Articular surfaces are

Answer 4

Scapula: glenoid fossa (concave)
Humeral: humeral head (convex)

Improved fit by glenoid labrum ( narrow rim of fibrocartilage)
: like a golf tee and ball

Question 5

Qualities of shoulder capsule

Answer 5

Capsular strength: weak
Capsule: is thin and lax allows for wide ROM- strengthened by tendons of subscapularis, supraspinatus, infraspinatus, and teres minor.

Inferior folds present when shoulder is in anatomical position, unfold as shoulder elevates.
Shoulder is immobilized in adduction ( often these folds adhere to one another)

Question 6

Ligaments for shoulder (3)

Answer 6

Glenohumeral lig.
Coracohhumeral lig.
Transverse humeral lig.

• (coracoacromila lig is considered an accessory ligament.)

Question 7

Glenohumeral ligament is…

Answer 7

Superior, inferior, middle,

3 weak bands of fibrous tissue strengthen front of capsule

Question 8

Coracohumeral ligament…

Answer 8

Strengthens capsule above

stretches from root of coracoid process to the greater tuberosity of the humerus

Question 9

Transverse humeral ligament…

Answer 9

Strengthens the capsule and bridge the gap between tuberosities ( greater and lesser) of humerus

Question 10

Bursae (4)

Answer 10

Subscapular
Subdeltoid
Subacromial
Subcoracoid

Question 11

Nerve inervations

Answer 11

Suprascapular nerve
Axillary nerve
lateral pectoral nerve

Question 12

Blood inervation

Answer 12

Branches of axillary and subclavian arteries

Question 13

Muscles associated

Answer 13

tendons of rotator cuff mm
Deltoideii
Biceps brachii
Long head of triceps
Pectoralis major
Teres major
Latissimus dorsi
Coracobrachialis

Question 14

Pathology and trauma to shoulder…

Answer 14

Anterior dislocation m/c

• weakness of jt. Capsule
• Progressive ligamentous laxity and damaged to glenoid labrum cause recurrent dislocations

Question 15

Rotator cuff injury

Answer 15

Due to rigorous or ballistic circumduction involving supraspinatus tendon

May progress from chronic tendonitis to clacific tendonsitis and bursitis

Question 16

Adhesive Capsulitis

Answer 16

Frozen shoulder
Idiopathic
F>M

Question 17

Resting position ( most loose pack) at Glenohumeral jt

Answer 17

55-70 abduction
30 horizontal adduction
Neutral rotation
( kinda like reaching out for a hand shake)

Question 18

Closed-pack position at Glenohumeral jt.

Answer 18

Full elevation

- maximum combined abduction and external rotation

Question 19

Capsular pattern ( of restriction) at Glenohumeral jt.

Answer 19

Lateral rotation more limited than abduction which is more limited than medial rotation

Question 20

What are the joint mobs done for Glenohumeral jt?

Answer 20

To increase ABD- inf glide, sup roll (supine)
To increase Flex, internal rot.- post glide, ant roll (supine)
To increase Ext, ext rot. Hor. ABD - ant glide, post roll (supine/ prone)