Exiting office trailer, slipped and fell down two steps. Continued working his regular shift for 10 days. Sought medical treatment 2/19/2011. At that time was put on modified duty. Diagnosis contusion, hip and shoulder. Thinking this was a first-aid treatment, I did not file a report. After receiving notice on 4/8/2011 about the referral to an Ortho doctor, I am filing this report.