On 4/8/10 employee was going up a flight of steps when his right knee buckled, he fell & struck his right elbow. He sought medical attention & no injury was found. He went back to doctor for a follow up on 5/12/10. Fluid was drained from his elbow and employee was put on restricted duty 5/12/10. This accident is being reported on 5/13/10, within 10 days of restricted duty.