Amendola must have very loose ligaments. Last year the elbow dislocation, and now dislocating his sternoclavicular joint.
Very rare injury (seen it only once) and can be life threatening it the clavicle dislocates posteriorly into your trachea/esophagus/aorta. to reduce (put back in place) them in the OR they say have a cardiothoracic surgeon on standby.
Likely just an anterior SC dislocation then.