Injured had lifted a roller into place at unit #119 dryer at Pinnacle Prep Plant. Injured worked until Jan 15, 2010 and was off work until Feb 12, 2010. Injured stated that his back was hurting prior to Dec 9, 2009 and that on Jan 15, 2010 he had lifted a 5 gallon bucket of anti freeze feeling a twinge in his back went to see a doctor. MRI showed degenerative arthritis.