Employee was operating #20548 a D10 Dozer on the dump and Truck #24903 a 789 backed up and struck the cab area jarring the employee. Employee completed his shift and went to Logan Regional Medical Center and was diagnosed with a Thoracic and Cervical Sprain and taken off work till 1/3/2014. Employee was examined by a specialist on 1/3/2014 and taken off work thru 3/3/2014.