On 6/16/10 EE was lifting a bearing into a shelf, when he experienced back pain. The ER doctor said it was a pulled muscle & told him to take Ibuprofen. He worked every scheduled shift until 8/16/10 when he went to his personal doctor. At that time she ordered tests & placed him on restricted duty. He did not return to work until 8/19/10, at which time this event became reportable.