Shoulder and Elbow Joints

Question 1

What are the four joints of the shoulder complex (girdle

Answer 1

Glenohumeral (GH) Joint
Acromioclavicular (AC) joint
Sternoclavicular (SC) Joint
Scapulothoracic (ST) joint.

Question 2

Outline the roll of the rotator cuff muscles in controlling the humeral head during shoulder abduction

Answer 2

• The rotator cuff keeps the humeral head centered within the glenoid during motion and allows the deltoid to function. The subscapularis, infraspinatus, and teres minor depress the humeral head, counteracting the upward pull of the deltoid

Question 3

Define impingement syndrome

Answer 3

describes a condition in which the tendons of the rotator cuff of the shoulder are pinched as they pass between the top of the upper arm (humerus) and the tip of the shoulder (acromion).

Question 4

What factors (mechanisms) are commonly thought to contribute to shoulder impingement syndrome? Other than swimming what sorts of physical activities (both sporting and work related) are likely to increase the risk of shoulder impingement syndrome?

Answer 4

Overhead activity of the shoulder, especially repeated activity, is a risk factor for shoulder impingement syndrome. Examples include: painting, lifting, swimming, tennis, and other overhead sports.

Question 5

7. Which of the elbow flexors has the greatest force generating capacity at 1000 of elbow flexion?

Answer 5

Brachialis

Question 6

Explain which muscles are recruited when screwing with the right hand

Answer 6

Supinator

Brachioradialis