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Anatomy of the Shoulder Girdle

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Questions and Answers

What is the primary function of the shoulder girdle?

To constrain the range of motion at the elbow

To augment movement of the spine

To position the hand in space (correct)

To provide stability to the upper extremity

What allows for the wide range of motion at the shoulder girdle?

The absence of bony constraints (correct)

The soft tissues that provide stability

The bony constraints of the joints

The stiffness of the surrounding muscles

What is necessary for a complete understanding of the biomechanics of the shoulder?

An analysis of the acromioclavicular, sternoclavicular, and scapulothoracic articulations

An analysis of the surrounding muscles, ligaments, and cartilage

An analysis of the four articulations and the surrounding muscles, ligaments, and cartilage (correct)

An analysis of the glenohumeral articulation only

What is unique about the shoulder joint in the body?

It is the most dynamic and mobile joint in the body Signup and view all the answers

What is the plane in which forward elevation of the humerus occurs?

Sagittal plane Signup and view all the answers

What limits the range of abduction in the coronal plane?

Bony impingement of the greater tuberosity on the acromion Signup and view all the answers

What is the purpose of the subsequent sections of this chapter?

To describe the manner in which motion is achieved at each of the articulations Signup and view all the answers

What is the result of the cooperation of the four joints in the shoulder complex?

Mobility greater than that afforded by any one individual articulation Signup and view all the answers

What is the average forward elevation in men?

167° Signup and view all the answers

Why is forward elevation in the plane of the scapula considered more functional?

Because the inferior portion of the capsule is most lax in this plane Signup and view all the answers

What happens to shoulder range of motion as part of the aging process?

It decreases Signup and view all the answers

What can counteract the decrease in shoulder range of motion with age?

Physical activity Signup and view all the answers