The Acromioclavicular (AC)joint Contributes to Shoulder Elevation ____________________

question 18

Multiple Choice

The acromioclavicular (AC) joint contributes to shoulder elevation ____________________.

• A) between 30° and 90° of abduction when tension on the trapezoid component of the coracoclavicular ligament produces a posterior rotation of the clavicle
• B) after 90° of shoulder abduction and until all scapulothoracic motion is taken up
• C) between 30° and 90° of abduction when anterior rotation of the clavicle allows for 30° of scapular upward rotation
• D) after 60° of abduction

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