Week 8 Task Sheet - Shoulder Conditions

Question 1

What are the static stabilisers of the GHJ?

Answer 1

Glenoid Labrum
Ligament Complex (coracohumeral and coracoacromial ligaments)

Question 2

What is the structure of the glenoid labrum?

Answer 2

fibrocartilagenous pear-shaped rim which deepens the glenoid fossa

Also provides attachment for long head of biceps and triceps

Question 3

What are the attachments of the coracohumeral ligament?

Answer 3

O: lateral border of coracoid
I: superior aspect of anatomical neck of humerus and to transverse humeral ligament

Question 4

What is the role of the coracohumeral ligament?

Answer 4

Blends with the joint capsule and overall improves stability of the shoulder

Question 5

What are the attachments of the coracoacromial ligament?

Answer 5

O: lateral border of coracoid
I: apex of acromion - anterior to ACJ

Question 6

What is the function of the coracoacromial ligament?

Answer 6

Prevents superior displacement of the humerus - forms the fibroosseous arch

Question 7

What are the dynamic stabilisers of the glenohumeral joint?

Answer 7

supraspinatus, infraspinatus, teres minor, subsacpularis, LH of biceps tendon, LH of triceps tendon

Question 8

How do the rotator cuff improve stability of the shoulder?

Answer 8

act as contractile ligaments to keep the HoH in glenoid

Question 9

What is the role of supraspinatus in GHJ stability?

Answer 9

prevents superior translation of humerus

Question 10

What is the role of the infraspinatus and trees minor in GHJ stability?

Answer 10

prevent anterior translation of humerus

Question 11

What is the role of subscapularis in GHJ stability?

Answer 11

prevents posterior translation of humerus

Question 12

What is the movement of the shoulder complex to achieve full flexion?

Answer 12

Initially - pure GH movement to 70 degrees,

Then LR and protraction of scapular in a 2:1 ratio to achieve full 180 degrees

Question 13

What is the movement of the shoulder complex to achieve full shoulder extension?

Answer 13

Pure GH movement to 50 degrees

Then combines with MR and retraction of scapula to achieve 70 degrees extension

Question 14

What is the role of the shoulder complex in abduction?

Answer 14

Initial 20-30 degrees is pure GHJ

Then lateral rotation and elevation of the scapula in a 2:1 ratio to clear the acromion

Final 10 degrees there is LR of humerus to increase articulation of the HoH in glenoid

Question 15

What muscles LR the scapula?

Answer 15

Upper traps, lower traps, serrates anterior

Question 16

What muscles MR the scapula?

Answer 16

Pec minor, levator scapulae, rhomboid major and minor