Employee was working on barge dock loading empty barges. Employee was bending over to pick up an accudraft box which weighs 5-10 lbs. He stated when he stood back up he felt a sharp pain in his back. Took employee to get examined on 11/16/07 doctor did not prescribe any medication but did place EE on light duty for a week. EE's personal doctor excused him from work on 11/21/07.