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Questions and Answers
What is the sixth kinematic principle of abduction?
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?
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?
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?
What is the range of external rotation that accompanies full active shoulder abduction?
Which process does the greater tubercle of the humerus pass posterior to during shoulder abduction?
Which process does the greater tubercle of the humerus pass posterior to during shoulder abduction?
What is the subacromial space?
What is the subacromial space?
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?
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?
Which plane of abduction had a higher ratio of external rotation per degree of abduction?
Which plane of abduction had a higher ratio of external rotation per degree of abduction?
What is the majority of external rotation occurring before during full active shoulder abduction?
What is the majority of external rotation occurring before during full active shoulder abduction?
What happens when the greater tubercle of the humerus jams against the contents within the subacromial space?
What happens when the greater tubercle of the humerus jams against the contents within the subacromial space?
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