EE was using one scoop to push another scoop out of a dip when the bucket of the scoop fell off the other scoop resulting in his head hitting the canopy. He continued to work until 9-12-11. Accident was told by injured to not have happened on the job. A medical review was conducted and determined on 11-2-11 to be work related. Safety Dept was notified on 11-8-11 of the review.