10 Questions
What is the sixth kinematic principle of abduction?
The humerus naturally externally rotates during shoulder abduction
What is the purpose of external rotation during shoulder abduction?
To avoid jamming the greater tubercle of the humerus against the acromion process
What is the ratio of external rotation to humeral elevation during strict frontal plane abduction?
Higher than abduction in the scapular plane
What is the range of external rotation that accompanies full active shoulder abduction?
25-50 degrees
Which process does the greater tubercle of the humerus pass posterior to during shoulder abduction?
Acromion process
What is the subacromial space?
A space between the acromion process and the rotator cuff tendons
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
Which plane of abduction had a higher ratio of external rotation per degree of abduction?
Strict frontal plane abduction
What is the majority of external rotation occurring before during full active shoulder abduction?
Before 70-80 degrees of abduction
What happens when the greater tubercle of the humerus jams against the contents within the subacromial space?
Pain and discomfort
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