Question: which one of the following is the mechanism for an acromioclavicular sprain?
Answer: The most common mechanism for an acromioclavicular joint injury is a fall directly onto the acromion, with the arm adducted up against the body. ... A fall onto an outstretched hand (FOOSH injury) and a downward force on the upper extremity have also been implicated in acromioclavicular joint injuries.