EE was using his hands to pull on a section of handrail to move it enough for a come-a-long chain to clear. The handrail broke loose and he fell backwards about 5 to 6 ft, EE completed the shift. No work was schedule for Monday 9/6/10 due to Labor Day Holiday. When EE returned to work on Tuesday 9/7/10 his knee was swollen and was taken to the doc and was put on light duty.