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sixth kinematic principle - N

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Questions and Answers

What is the sixth kinematic principle of abduction?

The humerus naturally internally rotates during shoulder abduction

The humerus naturally externally rotates during shoulder abduction (correct)

The humerus stays stationary during shoulder abduction

The humerus rotates randomly during shoulder abduction

What is the purpose of external rotation during shoulder abduction?

To jam the greater tubercle of the humerus against the acromion process

To avoid jamming the greater tubercle of the humerus against the acromion process (correct)

To increase the range of motion of the shoulder joint

To decrease the range of motion of the shoulder joint

What is the ratio of external rotation to humeral elevation during strict frontal plane abduction?

Higher than abduction in the scapular plane (correct)

Lower than abduction in the scapular plane

The same as abduction in the scapular plane

There is no difference between strict frontal plane abduction and abduction in the scapular plane

What is the range of external rotation that accompanies full active shoulder abduction?

25-50 degrees Signup and view all the answers

Which process does the greater tubercle of the humerus pass posterior to during shoulder abduction?

Acromion process Signup and view all the answers

What is the subacromial space?

A space between the acromion process and the rotator cuff tendons Signup and view all the answers

What is the name of the group of researchers who showed differing ratios of external rotation to humeral elevation based on the specific plane of elevation?

Stokdijk and colleagues Signup and view all the answers

Which plane of abduction had a higher ratio of external rotation per degree of abduction?

Strict frontal plane abduction Signup and view all the answers

What is the majority of external rotation occurring before during full active shoulder abduction?

Before 70-80 degrees of abduction Signup and view all the answers

What happens when the greater tubercle of the humerus jams against the contents within the subacromial space?

Pain and discomfort Signup and view all the answers

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