An emergency room physician examines a patient who has fallen from a motorcycle and injured his shoulder. The clinician notices a loss of the normal contour of the shoulder and a abnormal-appearing depression below the acromion. Which of the following injuries did the patient most likely sustain?
Avulsion of the coronoid process Dislocated shoulder joint Fracture of the midshaft of the humerus Fracture of the surgical neck of the humerus