A 20-year-old woman presents to her physician after falling onto her shoulder while skiing. She is diagnosed with an acromioclavicular separation, with greater than 100% superior displacement of the clavicle. What structures must be damaged to allow this degree of displacement?

A 20-year-old woman presents to her physician after falling onto her shoulder while skiing. She is diagnosed with an acromioclavicular separation, with greater than 100% superior displacement of the clavicle. What structures must be damaged to allow this degree of displacement?