A 19 year-old male presents to the emergency department with a complaint of right shoulder pain. He was tackled from behind in a rugby game three days prior to presentation and has been experiencing pain over the anterior aspect of his right shoulder since that time. Physical exam is notable for tenderness over the right acromioclavicular (AC) joint and pain with both active and passive range of motion of the right shoulder. X-rays (Figure 1) show “no obvious fracture or subluxation.” However, based on your exam and clinical suspicion, closer inspection reveals abnormal alignment between the clavicle and the acromion consistent with AC joint injury…

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